diff --git a/build-common.sh b/build-common.sh
new file mode 100755
index 0000000..d26ba3a
--- /dev/null
+++ b/build-common.sh
@@ -0,0 +1,132 @@
+# latest version of this file can be found at
+# https://android.googlesource.com/platform/external/lldb-utils
+#
+# inputs
+# $PROJ - project name (cmake|ninja|swig)
+# $VER - project version
+# $1 - name of this file
+#
+# this file does the following:
+#
+# 1) define the following env vars
+#    OS - linux|darwin|windows
+#    USER - username
+#    CORES - numer of cores (for parallel builds)
+#    PATH (with appropriate compilers)
+#    CFLAGS/CXXFLAGS/LDFLAGS
+#    RD - root directory for source and object files
+#    INSTALL - install directory/git repo root
+#    SCRIPT_FILE=absolute path to the parent build script
+#    SCRIPT_DIR=absolute path to the parent build script's directory
+#    COMMON_FILE=absolute path to this file
+# 2) create an empty tmp directory at /tmp/$PROJ-$USER
+# 3) checkout the destination git repo to /tmp/prebuilts/$PROJ/$OS-x86/$VER
+# 4) cd $RD
+
+UNAME="$(uname)"
+case "$UNAME" in
+Linux)
+    SCRATCH=/tmp
+    OS='linux'
+    INSTALL_VER=$VER
+    ;;
+Darwin)
+    SCRATCH=/tmp
+    OS='darwin'
+    OSX_MIN=10.6
+    export CFLAGS="$CFLAGS -mmacosx-version-min=$OSX_MIN"
+    export CXXFLAGS="$CXXFLAGS -mmacosx-version-min=$OSX_MIN"
+    export LDFLAGS="$LDFLAGS -mmacosx-version-min=$OSX_MIN"
+    INSTALL_VER=$VER
+    ;;
+*_NT-*)
+    if [[ "$UNAME" == CYGWIN_NT-* ]]; then
+        PATH_PREFIX=/cygdrive
+    else
+        # MINGW32_NT-*
+        PATH_PREFIX=
+    fi
+    SCRATCH=$PATH_PREFIX/d/src/tmp
+    USER=$USERNAME
+    OS='windows'
+    CORES=$NUMBER_OF_PROCESSORS
+    # VS2013 x64 Native Tools Command Prompt
+    case "$MSVS" in
+    2013)
+        export PATH="$PATH_PREFIX/c/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/amd64/":"$PATH_PREFIX/c/Program Files (x86)/Microsoft Visual Studio 12.0/Common7/IDE/":"$PATH"
+        export INCLUDE="C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\INCLUDE;C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\ATLMFC\\INCLUDE;C:\\Program Files (x86)\\Windows Kits\\8.1\\include\\shared;C:\\Program Files (x86)\\Windows Kits\\8.1\\include\\um;C:\\Program Files (x86)\\Windows Kits\\8.1\\include\\winrt;"
+        export LIB="C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\LIB\\amd64;C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\ATLMFC\\LIB\\amd64;C:\\Program Files (x86)\\Windows Kits\\8.1\\lib\\winv6.3\\um\\x64;"
+        export LIBPATH="C:\\Windows\\Microsoft.NET\\Framework64\\v4.0.30319;C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\LIB\\amd64;C:\\Program Files (x86)\\Microsoft Visual Studio 12.0\\VC\\ATLMFC\\LIB\\amd64;C:\\Program Files (x86)\\Windows Kits\\8.1\\References\\CommonConfiguration\\Neutral;C:\\Program Files (x86)\\Microsoft SDKs\\Windows\\v8.1\\ExtensionSDKs\\Microsoft.VCLibs\\12.0\\References\\CommonConfiguration\\neutral;"
+        INSTALL_VER=${VER}_${MSVS}
+        ;;
+    *)
+        # g++/make build
+        export CC=x86_64-w64-mingw32-gcc
+        export CXX=x86_64-w64-mingw32-g++
+        export LD=x86_64-w64-mingw32-ld
+        ;;
+    esac
+    ;;
+*)
+    exit 1
+    ;;
+esac
+
+RD=$SCRATCH/$PROJ-$USER
+INSTALL="$RD/install"
+
+# OSX lacks a "realpath" bash command
+realpath() {
+    [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
+}
+
+SCRIPT_FILE=$(realpath "$0")
+SCRIPT_DIR="$(dirname "$SCRIPT_FILE")"
+COMMON_FILE="$SCRIPT_DIR/$1"
+
+cd /tmp # windows can't delete if you're in the dir
+rm -rf $RD
+mkdir -p $INSTALL
+mkdir -p $RD
+cd $RD
+
+# clone prebuilt gcc
+case "$OS" in
+linux)
+    GCC_DIR=$RD/gcc
+    GCC_LIB=$GCC_DIR/lib/gcc/x86_64-linux/4.8 # crtbegin.o and libgcc.a
+    GCC_LIB2=$GCC_DIR/x86_64-linux/lib64 # libgcc_s.so
+
+    # can't get prebuilt clang working so we're using host clang-3.5 https://b/22748915
+    export CC=clang-3.5
+    export CXX=clang++-3.5
+    export CFLAGS="$CFLAGS -fuse-ld=gold --sysroot $GCC_DIR/sysroot -B$GCC_LIB"
+    export CXXFLAGS="$CFLAGS -Ix86_64-linux/include/c++/4.8 -Ix86_64-linux/include/x86_64-linux/c++/4.8"
+    export LDFLAGS="$LDFLAGS -m64 --sysroot $GCC_DIR/sysroot -L$GCC_LIB -L$GCC_LIB2"
+    # lldb uses at least one function from glibc2.12
+    git clone https://android.googlesource.com/platform/prebuilts/gcc/linux-x86/host/x86_64-linux-glibc2.15-4.8 $GCC_DIR
+    ;;
+esac
+
+commit_and_push()
+{
+    # check into a local git clone
+    rm -rf $SCRATCH/prebuilts/$PROJ/
+    mkdir -p $SCRATCH/prebuilts/$PROJ/
+    cd $SCRATCH/prebuilts/$PROJ/
+    git clone https://android.googlesource.com/platform/prebuilts/$PROJ/$OS-x86
+    GIT_REPO="$SCRATCH/prebuilts/$PROJ/$OS-x86"
+    cd $GIT_REPO
+    git rm -r * || true  # ignore error caused by empty directory
+    mv $INSTALL/* $GIT_REPO
+    cp $SCRIPT_FILE $GIT_REPO
+    cp $COMMON_FILE $GIT_REPO
+
+    git add .
+    git commit -m "Adding binaries for $INSTALL_VER"
+
+    # execute this command to upload
+    #git push origin HEAD:refs/for/master
+
+    rm -rf $RD || true  # ignore error
+}
diff --git a/build-glog.sh b/build-glog.sh
new file mode 100755
index 0000000..36b3178
--- /dev/null
+++ b/build-glog.sh
@@ -0,0 +1,29 @@
+#!/bin/bash -ex
+# latest version of this file can be found at
+# https://android.googlesource.com/platform/external/lldb-utils
+#
+# Download & build glog on the local machine
+# works on Linux, OS X
+# TODO: get it working on Windows
+# leaves output in /tmp/prebuilts/libglog/$OS-x86
+
+PROJ=libglog
+VER=0.3.4
+
+source $(dirname "$0")/build-common.sh build-common.sh
+
+BASE=${PROJ#lib}-$VER
+TGZ=v${VER}.tar.gz
+
+curl -L https://github.com/google/glog/archive/$TGZ -o $TGZ
+
+tar xzf $TGZ || cat $TGZ # if this fails, we're probably getting an http error
+cd $BASE
+mkdir $RD/build
+cd $RD/build
+$RD/$BASE/configure --prefix=$INSTALL
+make -j$CORES
+make install
+
+commit_and_push
+
diff --git a/include/glog/log_severity.h b/include/glog/log_severity.h
new file mode 100644
index 0000000..99945a4
--- /dev/null
+++ b/include/glog/log_severity.h
@@ -0,0 +1,92 @@
+// Copyright (c) 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef BASE_LOG_SEVERITY_H__
+#define BASE_LOG_SEVERITY_H__
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// Variables of type LogSeverity are widely taken to lie in the range
+// [0, NUM_SEVERITIES-1].  Be careful to preserve this assumption if
+// you ever need to change their values or add a new severity.
+typedef int LogSeverity;
+
+const int GLOG_INFO = 0, GLOG_WARNING = 1, GLOG_ERROR = 2, GLOG_FATAL = 3,
+  NUM_SEVERITIES = 4;
+#ifndef GLOG_NO_ABBREVIATED_SEVERITIES
+# ifdef ERROR
+#  error ERROR macro is defined. Define GLOG_NO_ABBREVIATED_SEVERITIES before including logging.h. See the document for detail.
+# endif
+const int INFO = GLOG_INFO, WARNING = GLOG_WARNING,
+  ERROR = GLOG_ERROR, FATAL = GLOG_FATAL;
+#endif
+
+// DFATAL is FATAL in debug mode, ERROR in normal mode
+#ifdef NDEBUG
+#define DFATAL_LEVEL ERROR
+#else
+#define DFATAL_LEVEL FATAL
+#endif
+
+extern GOOGLE_GLOG_DLL_DECL const char* const LogSeverityNames[NUM_SEVERITIES];
+
+// NDEBUG usage helpers related to (RAW_)DCHECK:
+//
+// DEBUG_MODE is for small !NDEBUG uses like
+//   if (DEBUG_MODE) foo.CheckThatFoo();
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     foo.CheckThatFoo();
+//   #endif
+//
+// IF_DEBUG_MODE is for small !NDEBUG uses like
+//   IF_DEBUG_MODE( string error; )
+//   DCHECK(Foo(&error)) << error;
+// instead of substantially more verbose
+//   #ifndef NDEBUG
+//     string error;
+//     DCHECK(Foo(&error)) << error;
+//   #endif
+//
+#ifdef NDEBUG
+enum { DEBUG_MODE = 0 };
+#define IF_DEBUG_MODE(x)
+#else
+enum { DEBUG_MODE = 1 };
+#define IF_DEBUG_MODE(x) x
+#endif
+
+#endif  // BASE_LOG_SEVERITY_H__
diff --git a/include/glog/logging.h b/include/glog/logging.h
new file mode 100644
index 0000000..2b3fbd3
--- /dev/null
+++ b/include/glog/logging.h
@@ -0,0 +1,1603 @@
+// Copyright (c) 1999, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney
+//
+// This file contains #include information about logging-related stuff.
+// Pretty much everybody needs to #include this file so that they can
+// log various happenings.
+//
+#ifndef _LOGGING_H_
+#define _LOGGING_H_
+
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <iosfwd>
+#include <ostream>
+#include <sstream>
+#include <string>
+#if 1
+# include <unistd.h>
+#endif
+#include <vector>
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+#if defined(_MSC_VER)
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n) __pragma(warning(push)) \
+                                     __pragma(warning(disable:n))
+#define GLOG_MSVC_POP_WARNING() __pragma(warning(pop))
+#else
+#define GLOG_MSVC_PUSH_DISABLE_WARNING(n)
+#define GLOG_MSVC_POP_WARNING()
+#endif
+
+// We care a lot about number of bits things take up.  Unfortunately,
+// systems define their bit-specific ints in a lot of different ways.
+// We use our own way, and have a typedef to get there.
+// Note: these commands below may look like "#if 1" or "#if 0", but
+// that's because they were constructed that way at ./configure time.
+// Look at logging.h.in to see how they're calculated (based on your config).
+#if 1
+#include <stdint.h>             // the normal place uint16_t is defined
+#endif
+#if 1
+#include <sys/types.h>          // the normal place u_int16_t is defined
+#endif
+#if 1
+#include <inttypes.h>           // a third place for uint16_t or u_int16_t
+#endif
+
+#if 0
+#include <gflags/gflags.h>
+#endif
+
+namespace google {
+
+#if 1      // the C99 format
+typedef int32_t int32;
+typedef uint32_t uint32;
+typedef int64_t int64;
+typedef uint64_t uint64;
+#elif 1   // the BSD format
+typedef int32_t int32;
+typedef u_int32_t uint32;
+typedef int64_t int64;
+typedef u_int64_t uint64;
+#elif 0    // the windows (vc7) format
+typedef __int32 int32;
+typedef unsigned __int32 uint32;
+typedef __int64 int64;
+typedef unsigned __int64 uint64;
+#else
+#error Do not know how to define a 32-bit integer quantity on your system
+#endif
+
+}
+
+// The global value of GOOGLE_STRIP_LOG. All the messages logged to
+// LOG(XXX) with severity less than GOOGLE_STRIP_LOG will not be displayed.
+// If it can be determined at compile time that the message will not be
+// printed, the statement will be compiled out.
+//
+// Example: to strip out all INFO and WARNING messages, use the value
+// of 2 below. To make an exception for WARNING messages from a single
+// file, add "#define GOOGLE_STRIP_LOG 1" to that file _before_ including
+// base/logging.h
+#ifndef GOOGLE_STRIP_LOG
+#define GOOGLE_STRIP_LOG 0
+#endif
+
+// GCC can be told that a certain branch is not likely to be taken (for
+// instance, a CHECK failure), and use that information in static analysis.
+// Giving it this information can help it optimize for the common case in
+// the absence of better information (ie. -fprofile-arcs).
+//
+#ifndef GOOGLE_PREDICT_BRANCH_NOT_TAKEN
+#if 1
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) (__builtin_expect(x, 0))
+#define GOOGLE_PREDICT_FALSE(x) (__builtin_expect(x, 0))
+#define GOOGLE_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+#define GOOGLE_PREDICT_BRANCH_NOT_TAKEN(x) x
+#define GOOGLE_PREDICT_FALSE(x) x
+#define GOOGLE_PREDICT_TRUE(x) x
+#endif
+#endif
+
+// Make a bunch of macros for logging.  The way to log things is to stream
+// things to LOG(<a particular severity level>).  E.g.,
+//
+//   LOG(INFO) << "Found " << num_cookies << " cookies";
+//
+// You can capture log messages in a string, rather than reporting them
+// immediately:
+//
+//   vector<string> errors;
+//   LOG_STRING(ERROR, &errors) << "Couldn't parse cookie #" << cookie_num;
+//
+// This pushes back the new error onto 'errors'; if given a NULL pointer,
+// it reports the error via LOG(ERROR).
+//
+// You can also do conditional logging:
+//
+//   LOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+// You can also do occasional logging (log every n'th occurrence of an
+// event):
+//
+//   LOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// The above will cause log messages to be output on the 1st, 11th, 21st, ...
+// times it is executed.  Note that the special google::COUNTER value is used
+// to identify which repetition is happening.
+//
+// You can also do occasional conditional logging (log every n'th
+// occurrence of an event, when condition is satisfied):
+//
+//   LOG_IF_EVERY_N(INFO, (size > 1024), 10) << "Got the " << google::COUNTER
+//                                           << "th big cookie";
+//
+// You can log messages the first N times your code executes a line. E.g.
+//
+//   LOG_FIRST_N(INFO, 20) << "Got the " << google::COUNTER << "th cookie";
+//
+// Outputs log messages for the first 20 times it is executed.
+//
+// Analogous SYSLOG, SYSLOG_IF, and SYSLOG_EVERY_N macros are available.
+// These log to syslog as well as to the normal logs.  If you use these at
+// all, you need to be aware that syslog can drastically reduce performance,
+// especially if it is configured for remote logging!  Don't use these
+// unless you fully understand this and have a concrete need to use them.
+// Even then, try to minimize your use of them.
+//
+// There are also "debug mode" logging macros like the ones above:
+//
+//   DLOG(INFO) << "Found cookies";
+//
+//   DLOG_IF(INFO, num_cookies > 10) << "Got lots of cookies";
+//
+//   DLOG_EVERY_N(INFO, 10) << "Got the " << google::COUNTER << "th cookie";
+//
+// All "debug mode" logging is compiled away to nothing for non-debug mode
+// compiles.
+//
+// We also have
+//
+//   LOG_ASSERT(assertion);
+//   DLOG_ASSERT(assertion);
+//
+// which is syntactic sugar for {,D}LOG_IF(FATAL, assert fails) << assertion;
+//
+// There are "verbose level" logging macros.  They look like
+//
+//   VLOG(1) << "I'm printed when you run the program with --v=1 or more";
+//   VLOG(2) << "I'm printed when you run the program with --v=2 or more";
+//
+// These always log at the INFO log level (when they log at all).
+// The verbose logging can also be turned on module-by-module.  For instance,
+//    --vmodule=mapreduce=2,file=1,gfs*=3 --v=0
+// will cause:
+//   a. VLOG(2) and lower messages to be printed from mapreduce.{h,cc}
+//   b. VLOG(1) and lower messages to be printed from file.{h,cc}
+//   c. VLOG(3) and lower messages to be printed from files prefixed with "gfs"
+//   d. VLOG(0) and lower messages to be printed from elsewhere
+//
+// The wildcarding functionality shown by (c) supports both '*' (match
+// 0 or more characters) and '?' (match any single character) wildcards.
+//
+// There's also VLOG_IS_ON(n) "verbose level" condition macro. To be used as
+//
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished with just VLOG(2) << ...;
+//   }
+//
+// There are also VLOG_IF, VLOG_EVERY_N and VLOG_IF_EVERY_N "verbose level"
+// condition macros for sample cases, when some extra computation and
+// preparation for logs is not needed.
+//   VLOG_IF(1, (size > 1024))
+//      << "I'm printed when size is more than 1024 and when you run the "
+//         "program with --v=1 or more";
+//   VLOG_EVERY_N(1, 10)
+//      << "I'm printed every 10th occurrence, and when you run the program "
+//         "with --v=1 or more. Present occurence is " << google::COUNTER;
+//   VLOG_IF_EVERY_N(1, (size > 1024), 10)
+//      << "I'm printed on every 10th occurence of case when size is more "
+//         " than 1024, when you run the program with --v=1 or more. ";
+//         "Present occurence is " << google::COUNTER;
+//
+// The supported severity levels for macros that allow you to specify one
+// are (in increasing order of severity) INFO, WARNING, ERROR, and FATAL.
+// Note that messages of a given severity are logged not only in the
+// logfile for that severity, but also in all logfiles of lower severity.
+// E.g., a message of severity FATAL will be logged to the logfiles of
+// severity FATAL, ERROR, WARNING, and INFO.
+//
+// There is also the special severity of DFATAL, which logs FATAL in
+// debug mode, ERROR in normal mode.
+//
+// Very important: logging a message at the FATAL severity level causes
+// the program to terminate (after the message is logged).
+//
+// Unless otherwise specified, logs will be written to the filename
+// "<program name>.<hostname>.<user name>.log.<severity level>.", followed
+// by the date, time, and pid (you can't prevent the date, time, and pid
+// from being in the filename).
+//
+// The logging code takes two flags:
+//     --v=#           set the verbose level
+//     --logtostderr   log all the messages to stderr instead of to logfiles
+
+// LOG LINE PREFIX FORMAT
+//
+// Log lines have this form:
+//
+//     Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
+//
+// where the fields are defined as follows:
+//
+//   L                A single character, representing the log level
+//                    (eg 'I' for INFO)
+//   mm               The month (zero padded; ie May is '05')
+//   dd               The day (zero padded)
+//   hh:mm:ss.uuuuuu  Time in hours, minutes and fractional seconds
+//   threadid         The space-padded thread ID as returned by GetTID()
+//                    (this matches the PID on Linux)
+//   file             The file name
+//   line             The line number
+//   msg              The user-supplied message
+//
+// Example:
+//
+//   I1103 11:57:31.739339 24395 google.cc:2341] Command line: ./some_prog
+//   I1103 11:57:31.739403 24395 google.cc:2342] Process id 24395
+//
+// NOTE: although the microseconds are useful for comparing events on
+// a single machine, clocks on different machines may not be well
+// synchronized.  Hence, use caution when comparing the low bits of
+// timestamps from different machines.
+
+#ifndef DECLARE_VARIABLE
+#define MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#define DECLARE_VARIABLE(type, shorttype, name, tn)                     \
+  namespace fL##shorttype {                                             \
+    extern GOOGLE_GLOG_DLL_DECL type FLAGS_##name;                      \
+  }                                                                     \
+  using fL##shorttype::FLAGS_##name
+
+// bool specialization
+#define DECLARE_bool(name) \
+  DECLARE_VARIABLE(bool, B, name, bool)
+
+// int32 specialization
+#define DECLARE_int32(name) \
+  DECLARE_VARIABLE(google::int32, I, name, int32)
+
+// Special case for string, because we have to specify the namespace
+// std::string, which doesn't play nicely with our FLAG__namespace hackery.
+#define DECLARE_string(name)                                            \
+  namespace fLS {                                                       \
+    extern GOOGLE_GLOG_DLL_DECL std::string& FLAGS_##name;              \
+  }                                                                     \
+  using fLS::FLAGS_##name
+#endif
+
+// Set whether log messages go to stderr instead of logfiles
+DECLARE_bool(logtostderr);
+
+// Set whether log messages go to stderr in addition to logfiles.
+DECLARE_bool(alsologtostderr);
+
+// Set color messages logged to stderr (if supported by terminal).
+DECLARE_bool(colorlogtostderr);
+
+// Log messages at a level >= this flag are automatically sent to
+// stderr in addition to log files.
+DECLARE_int32(stderrthreshold);
+
+// Set whether the log prefix should be prepended to each line of output.
+DECLARE_bool(log_prefix);
+
+// Log messages at a level <= this flag are buffered.
+// Log messages at a higher level are flushed immediately.
+DECLARE_int32(logbuflevel);
+
+// Sets the maximum number of seconds which logs may be buffered for.
+DECLARE_int32(logbufsecs);
+
+// Log suppression level: messages logged at a lower level than this
+// are suppressed.
+DECLARE_int32(minloglevel);
+
+// If specified, logfiles are written into this directory instead of the
+// default logging directory.
+DECLARE_string(log_dir);
+
+// Sets the path of the directory into which to put additional links
+// to the log files.
+DECLARE_string(log_link);
+
+DECLARE_int32(v);  // in vlog_is_on.cc
+
+// Sets the maximum log file size (in MB).
+DECLARE_int32(max_log_size);
+
+// Sets whether to avoid logging to the disk if the disk is full.
+DECLARE_bool(stop_logging_if_full_disk);
+
+#ifdef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef MUST_UNDEF_GFLAGS_DECLARE_MACROS
+#undef DECLARE_VARIABLE
+#undef DECLARE_bool
+#undef DECLARE_int32
+#undef DECLARE_string
+#endif
+
+// Log messages below the GOOGLE_STRIP_LOG level will be compiled away for
+// security reasons. See LOG(severtiy) below.
+
+// A few definitions of macros that don't generate much code.  Since
+// LOG(INFO) and its ilk are used all over our code, it's
+// better to have compact code for these operations.
+
+#if GOOGLE_STRIP_LOG == 0
+#define COMPACT_GOOGLE_LOG_INFO google::LogMessage( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_INFO(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_INFO, message)
+#else
+#define COMPACT_GOOGLE_LOG_INFO google::NullStream()
+#define LOG_TO_STRING_INFO(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 1
+#define COMPACT_GOOGLE_LOG_WARNING google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_WARNING)
+#define LOG_TO_STRING_WARNING(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_WARNING, message)
+#else
+#define COMPACT_GOOGLE_LOG_WARNING google::NullStream()
+#define LOG_TO_STRING_WARNING(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 2
+#define COMPACT_GOOGLE_LOG_ERROR google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_ERROR)
+#define LOG_TO_STRING_ERROR(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_ERROR, message)
+#else
+#define COMPACT_GOOGLE_LOG_ERROR google::NullStream()
+#define LOG_TO_STRING_ERROR(message) google::NullStream()
+#endif
+
+#if GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_FATAL google::LogMessageFatal( \
+      __FILE__, __LINE__)
+#define LOG_TO_STRING_FATAL(message) google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_FATAL, message)
+#else
+#define COMPACT_GOOGLE_LOG_FATAL google::NullStreamFatal()
+#define LOG_TO_STRING_FATAL(message) google::NullStreamFatal()
+#endif
+
+// For DFATAL, we want to use LogMessage (as opposed to
+// LogMessageFatal), to be consistent with the original behavior.
+#ifdef NDEBUG
+#define COMPACT_GOOGLE_LOG_DFATAL COMPACT_GOOGLE_LOG_ERROR
+#elif GOOGLE_STRIP_LOG <= 3
+#define COMPACT_GOOGLE_LOG_DFATAL google::LogMessage( \
+      __FILE__, __LINE__, google::GLOG_FATAL)
+#else
+#define COMPACT_GOOGLE_LOG_DFATAL google::NullStreamFatal()
+#endif
+
+#define GOOGLE_LOG_INFO(counter) google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, &google::LogMessage::SendToLog)
+#define SYSLOG_INFO(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_INFO, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_WARNING(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_WARNING(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_WARNING, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_ERROR(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_ERROR(counter)  \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_FATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_FATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::GLOG_FATAL, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+#define GOOGLE_LOG_DFATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
+  &google::LogMessage::SendToLog)
+#define SYSLOG_DFATAL(counter) \
+  google::LogMessage(__FILE__, __LINE__, google::DFATAL_LEVEL, counter, \
+  &google::LogMessage::SendToSyslogAndLog)
+
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__CYGWIN__) || defined(__CYGWIN32__)
+// A very useful logging macro to log windows errors:
+#define LOG_SYSRESULT(result) \
+  if (FAILED(HRESULT_FROM_WIN32(result))) { \
+    LPSTR message = NULL; \
+    LPSTR msg = reinterpret_cast<LPSTR>(&message); \
+    DWORD message_length = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER | \
+                         FORMAT_MESSAGE_FROM_SYSTEM, \
+                         0, result, 0, msg, 100, NULL); \
+    if (message_length > 0) { \
+      google::LogMessage(__FILE__, __LINE__, google::GLOG_ERROR, 0, \
+          &google::LogMessage::SendToLog).stream() \
+          << reinterpret_cast<const char*>(message); \
+      LocalFree(message); \
+    } \
+  }
+#endif
+
+// We use the preprocessor's merging operator, "##", so that, e.g.,
+// LOG(INFO) becomes the token GOOGLE_LOG_INFO.  There's some funny
+// subtle difference between ostream member streaming functions (e.g.,
+// ostream::operator<<(int) and ostream non-member streaming functions
+// (e.g., ::operator<<(ostream&, string&): it turns out that it's
+// impossible to stream something like a string directly to an unnamed
+// ostream. We employ a neat hack by calling the stream() member
+// function of LogMessage which seems to avoid the problem.
+#define LOG(severity) COMPACT_GOOGLE_LOG_ ## severity.stream()
+#define SYSLOG(severity) SYSLOG_ ## severity(0).stream()
+
+namespace google {
+
+// They need the definitions of integer types.
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Initialize google's logging library. You will see the program name
+// specified by argv0 in log outputs.
+GOOGLE_GLOG_DLL_DECL void InitGoogleLogging(const char* argv0);
+
+// Shutdown google's logging library.
+GOOGLE_GLOG_DLL_DECL void ShutdownGoogleLogging();
+
+// Install a function which will be called after LOG(FATAL).
+GOOGLE_GLOG_DLL_DECL void InstallFailureFunction(void (*fail_func)());
+
+class LogSink;  // defined below
+
+// If a non-NULL sink pointer is given, we push this message to that sink.
+// For LOG_TO_SINK we then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and passing/storing them
+// somewhere more specific than the global log of the process.
+// Argument types:
+//   LogSink* sink;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+#define LOG_TO_SINK(sink, severity) \
+  google::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      google::GLOG_ ## severity,                         \
+      static_cast<google::LogSink*>(sink), true).stream()
+#define LOG_TO_SINK_BUT_NOT_TO_LOGFILE(sink, severity)                  \
+  google::LogMessage(                                    \
+      __FILE__, __LINE__,                                               \
+      google::GLOG_ ## severity,                         \
+      static_cast<google::LogSink*>(sink), false).stream()
+
+// If a non-NULL string pointer is given, we write this message to that string.
+// We then do normal LOG(severity) logging as well.
+// This is useful for capturing messages and storing them somewhere more
+// specific than the global log of the process.
+// Argument types:
+//   string* message;
+//   LogSeverity severity;
+// The cast is to disambiguate NULL arguments.
+// NOTE: LOG(severity) expands to LogMessage().stream() for the specified
+// severity.
+#define LOG_TO_STRING(severity, message) \
+  LOG_TO_STRING_##severity(static_cast<string*>(message)).stream()
+
+// If a non-NULL pointer is given, we push the message onto the end
+// of a vector of strings; otherwise, we report it with LOG(severity).
+// This is handy for capturing messages and perhaps passing them back
+// to the caller, rather than reporting them immediately.
+// Argument types:
+//   LogSeverity severity;
+//   vector<string> *outvec;
+// The cast is to disambiguate NULL arguments.
+#define LOG_STRING(severity, outvec) \
+  LOG_TO_STRING_##severity(static_cast<vector<string>*>(outvec)).stream()
+
+#define LOG_IF(severity, condition) \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+#define SYSLOG_IF(severity, condition) \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & SYSLOG(severity)
+
+#define LOG_ASSERT(condition)  \
+  LOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+#define SYSLOG_ASSERT(condition) \
+  SYSLOG_IF(FATAL, !(condition)) << "Assert failed: " #condition
+
+// CHECK dies with a fatal error if condition is not true.  It is *not*
+// controlled by NDEBUG, so the check will be executed regardless of
+// compilation mode.  Therefore, it is safe to do things like:
+//    CHECK(fp->Write(x) == 4)
+#define CHECK(condition)  \
+      LOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+             << "Check failed: " #condition " "
+
+// A container for a string pointer which can be evaluated to a bool -
+// true iff the pointer is NULL.
+struct CheckOpString {
+  CheckOpString(std::string* str) : str_(str) { }
+  // No destructor: if str_ is non-NULL, we're about to LOG(FATAL),
+  // so there's no point in cleaning up str_.
+  operator bool() const {
+    return GOOGLE_PREDICT_BRANCH_NOT_TAKEN(str_ != NULL);
+  }
+  std::string* str_;
+};
+
+// Function is overloaded for integral types to allow static const
+// integrals declared in classes and not defined to be used as arguments to
+// CHECK* macros. It's not encouraged though.
+template <class T>
+inline const T&       GetReferenceableValue(const T&           t) { return t; }
+inline char           GetReferenceableValue(char               t) { return t; }
+inline unsigned char  GetReferenceableValue(unsigned char      t) { return t; }
+inline signed char    GetReferenceableValue(signed char        t) { return t; }
+inline short          GetReferenceableValue(short              t) { return t; }
+inline unsigned short GetReferenceableValue(unsigned short     t) { return t; }
+inline int            GetReferenceableValue(int                t) { return t; }
+inline unsigned int   GetReferenceableValue(unsigned int       t) { return t; }
+inline long           GetReferenceableValue(long               t) { return t; }
+inline unsigned long  GetReferenceableValue(unsigned long      t) { return t; }
+inline long long      GetReferenceableValue(long long          t) { return t; }
+inline unsigned long long GetReferenceableValue(unsigned long long t) {
+  return t;
+}
+
+// This is a dummy class to define the following operator.
+struct DummyClassToDefineOperator {};
+
+}
+
+// Define global operator<< to declare using ::operator<<.
+// This declaration will allow use to use CHECK macros for user
+// defined classes which have operator<< (e.g., stl_logging.h).
+inline std::ostream& operator<<(
+    std::ostream& out, const google::DummyClassToDefineOperator&) {
+  return out;
+}
+
+namespace google {
+
+// This formats a value for a failing CHECK_XX statement.  Ordinarily,
+// it uses the definition for operator<<, with a few special cases below.
+template <typename T>
+inline void MakeCheckOpValueString(std::ostream* os, const T& v) {
+  (*os) << v;
+}
+
+// Overrides for char types provide readable values for unprintable
+// characters.
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const signed char& v);
+template <> GOOGLE_GLOG_DLL_DECL
+void MakeCheckOpValueString(std::ostream* os, const unsigned char& v);
+
+// Build the error message string. Specify no inlining for code size.
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext)
+    __attribute__ ((noinline));
+
+namespace base {
+namespace internal {
+
+// If "s" is less than base_logging::INFO, returns base_logging::INFO.
+// If "s" is greater than base_logging::FATAL, returns
+// base_logging::ERROR.  Otherwise, returns "s".
+LogSeverity NormalizeSeverity(LogSeverity s);
+
+}  // namespace internal
+
+// A helper class for formatting "expr (V1 vs. V2)" in a CHECK_XX
+// statement.  See MakeCheckOpString for sample usage.  Other
+// approaches were considered: use of a template method (e.g.,
+// base::BuildCheckOpString(exprtext, base::Print<T1>, &v1,
+// base::Print<T2>, &v2), however this approach has complications
+// related to volatile arguments and function-pointer arguments).
+class GOOGLE_GLOG_DLL_DECL CheckOpMessageBuilder {
+ public:
+  // Inserts "exprtext" and " (" to the stream.
+  explicit CheckOpMessageBuilder(const char *exprtext);
+  // Deletes "stream_".
+  ~CheckOpMessageBuilder();
+  // For inserting the first variable.
+  std::ostream* ForVar1() { return stream_; }
+  // For inserting the second variable (adds an intermediate " vs. ").
+  std::ostream* ForVar2();
+  // Get the result (inserts the closing ")").
+  std::string* NewString();
+
+ private:
+  std::ostringstream *stream_;
+};
+
+}  // namespace base
+
+template <typename T1, typename T2>
+std::string* MakeCheckOpString(const T1& v1, const T2& v2, const char* exprtext) {
+  base::CheckOpMessageBuilder comb(exprtext);
+  MakeCheckOpValueString(comb.ForVar1(), v1);
+  MakeCheckOpValueString(comb.ForVar2(), v2);
+  return comb.NewString();
+}
+
+// Helper functions for CHECK_OP macro.
+// The (int, int) specialization works around the issue that the compiler
+// will not instantiate the template version of the function on values of
+// unnamed enum type - see comment below.
+#define DEFINE_CHECK_OP_IMPL(name, op) \
+  template <typename T1, typename T2> \
+  inline std::string* name##Impl(const T1& v1, const T2& v2,    \
+                            const char* exprtext) { \
+    if (GOOGLE_PREDICT_TRUE(v1 op v2)) return NULL; \
+    else return MakeCheckOpString(v1, v2, exprtext); \
+  } \
+  inline std::string* name##Impl(int v1, int v2, const char* exprtext) { \
+    return name##Impl<int, int>(v1, v2, exprtext); \
+  }
+
+// We use the full name Check_EQ, Check_NE, etc. in case the file including
+// base/logging.h provides its own #defines for the simpler names EQ, NE, etc.
+// This happens if, for example, those are used as token names in a
+// yacc grammar.
+DEFINE_CHECK_OP_IMPL(Check_EQ, ==)  // Compilation error with CHECK_EQ(NULL, x)?
+DEFINE_CHECK_OP_IMPL(Check_NE, !=)  // Use CHECK(x == NULL) instead.
+DEFINE_CHECK_OP_IMPL(Check_LE, <=)
+DEFINE_CHECK_OP_IMPL(Check_LT, < )
+DEFINE_CHECK_OP_IMPL(Check_GE, >=)
+DEFINE_CHECK_OP_IMPL(Check_GT, > )
+#undef DEFINE_CHECK_OP_IMPL
+
+// Helper macro for binary operators.
+// Don't use this macro directly in your code, use CHECK_EQ et al below.
+
+#if defined(STATIC_ANALYSIS)
+// Only for static analysis tool to know that it is equivalent to assert
+#define CHECK_OP_LOG(name, op, val1, val2, log) CHECK((val1) op (val2))
+#elif !defined(NDEBUG)
+// In debug mode, avoid constructing CheckOpStrings if possible,
+// to reduce the overhead of CHECK statments by 2x.
+// Real DCHECK-heavy tests have seen 1.5x speedups.
+
+// The meaning of "string" might be different between now and 
+// when this macro gets invoked (e.g., if someone is experimenting
+// with other string implementations that get defined after this
+// file is included).  Save the current meaning now and use it 
+// in the macro.
+typedef std::string _Check_string;
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (google::_Check_string* _result =                \
+         google::Check##name##Impl(                      \
+             google::GetReferenceableValue(val1),        \
+             google::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__,                                             \
+        google::CheckOpString(_result)).stream()
+#else
+// In optimized mode, use CheckOpString to hint to compiler that
+// the while condition is unlikely.
+#define CHECK_OP_LOG(name, op, val1, val2, log)                         \
+  while (google::CheckOpString _result =                 \
+         google::Check##name##Impl(                      \
+             google::GetReferenceableValue(val1),        \
+             google::GetReferenceableValue(val2),        \
+             #val1 " " #op " " #val2))                                  \
+    log(__FILE__, __LINE__, _result).stream()
+#endif  // STATIC_ANALYSIS, !NDEBUG
+
+#if GOOGLE_STRIP_LOG <= 3
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, google::LogMessageFatal)
+#else
+#define CHECK_OP(name, op, val1, val2) \
+  CHECK_OP_LOG(name, op, val1, val2, google::NullStreamFatal)
+#endif // STRIP_LOG <= 3
+
+// Equality/Inequality checks - compare two values, and log a FATAL message
+// including the two values when the result is not as expected.  The values
+// must have operator<<(ostream, ...) defined.
+//
+// You may append to the error message like so:
+//   CHECK_NE(1, 2) << ": The world must be ending!";
+//
+// We are very careful to ensure that each argument is evaluated exactly
+// once, and that anything which is legal to pass as a function argument is
+// legal here.  In particular, the arguments may be temporary expressions
+// which will end up being destroyed at the end of the apparent statement,
+// for example:
+//   CHECK_EQ(string("abc")[1], 'b');
+//
+// WARNING: These don't compile correctly if one of the arguments is a pointer
+// and the other is NULL. To work around this, simply static_cast NULL to the
+// type of the desired pointer.
+
+#define CHECK_EQ(val1, val2) CHECK_OP(_EQ, ==, val1, val2)
+#define CHECK_NE(val1, val2) CHECK_OP(_NE, !=, val1, val2)
+#define CHECK_LE(val1, val2) CHECK_OP(_LE, <=, val1, val2)
+#define CHECK_LT(val1, val2) CHECK_OP(_LT, < , val1, val2)
+#define CHECK_GE(val1, val2) CHECK_OP(_GE, >=, val1, val2)
+#define CHECK_GT(val1, val2) CHECK_OP(_GT, > , val1, val2)
+
+// Check that the input is non NULL.  This very useful in constructor
+// initializer lists.
+
+#define CHECK_NOTNULL(val) \
+  google::CheckNotNull(__FILE__, __LINE__, "'" #val "' Must be non NULL", (val))
+
+// Helper functions for string comparisons.
+// To avoid bloat, the definitions are in logging.cc.
+#define DECLARE_CHECK_STROP_IMPL(func, expected) \
+  GOOGLE_GLOG_DLL_DECL std::string* Check##func##expected##Impl( \
+      const char* s1, const char* s2, const char* names);
+DECLARE_CHECK_STROP_IMPL(strcmp, true)
+DECLARE_CHECK_STROP_IMPL(strcmp, false)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, true)
+DECLARE_CHECK_STROP_IMPL(strcasecmp, false)
+#undef DECLARE_CHECK_STROP_IMPL
+
+// Helper macro for string comparisons.
+// Don't use this macro directly in your code, use CHECK_STREQ et al below.
+#define CHECK_STROP(func, op, expected, s1, s2) \
+  while (google::CheckOpString _result = \
+         google::Check##func##expected##Impl((s1), (s2), \
+                                     #s1 " " #op " " #s2)) \
+    LOG(FATAL) << *_result.str_
+
+
+// String (char*) equality/inequality checks.
+// CASE versions are case-insensitive.
+//
+// Note that "s1" and "s2" may be temporary strings which are destroyed
+// by the compiler at the end of the current "full expression"
+// (e.g. CHECK_STREQ(Foo().c_str(), Bar().c_str())).
+
+#define CHECK_STREQ(s1, s2) CHECK_STROP(strcmp, ==, true, s1, s2)
+#define CHECK_STRNE(s1, s2) CHECK_STROP(strcmp, !=, false, s1, s2)
+#define CHECK_STRCASEEQ(s1, s2) CHECK_STROP(strcasecmp, ==, true, s1, s2)
+#define CHECK_STRCASENE(s1, s2) CHECK_STROP(strcasecmp, !=, false, s1, s2)
+
+#define CHECK_INDEX(I,A) CHECK(I < (sizeof(A)/sizeof(A[0])))
+#define CHECK_BOUND(B,A) CHECK(B <= (sizeof(A)/sizeof(A[0])))
+
+#define CHECK_DOUBLE_EQ(val1, val2)              \
+  do {                                           \
+    CHECK_LE((val1), (val2)+0.000000000000001L); \
+    CHECK_GE((val1), (val2)-0.000000000000001L); \
+  } while (0)
+
+#define CHECK_NEAR(val1, val2, margin)           \
+  do {                                           \
+    CHECK_LE((val1), (val2)+(margin));           \
+    CHECK_GE((val1), (val2)-(margin));           \
+  } while (0)
+
+// perror()..googly style!
+//
+// PLOG() and PLOG_IF() and PCHECK() behave exactly like their LOG* and
+// CHECK equivalents with the addition that they postpend a description
+// of the current state of errno to their output lines.
+
+#define PLOG(severity) GOOGLE_PLOG(severity, 0).stream()
+
+#define GOOGLE_PLOG(severity, counter)  \
+  google::ErrnoLogMessage( \
+      __FILE__, __LINE__, google::GLOG_ ## severity, counter, \
+      &google::LogMessage::SendToLog)
+
+#define PLOG_IF(severity, condition) \
+  !(condition) ? (void) 0 : google::LogMessageVoidify() & PLOG(severity)
+
+// A CHECK() macro that postpends errno if the condition is false. E.g.
+//
+// if (poll(fds, nfds, timeout) == -1) { PCHECK(errno == EINTR); ... }
+#define PCHECK(condition)  \
+      PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN(!(condition))) \
+              << "Check failed: " #condition " "
+
+// A CHECK() macro that lets you assert the success of a function that
+// returns -1 and sets errno in case of an error. E.g.
+//
+// CHECK_ERR(mkdir(path, 0700));
+//
+// or
+//
+// int fd = open(filename, flags); CHECK_ERR(fd) << ": open " << filename;
+#define CHECK_ERR(invocation)                                          \
+PLOG_IF(FATAL, GOOGLE_PREDICT_BRANCH_NOT_TAKEN((invocation) == -1))    \
+        << #invocation
+
+// Use macro expansion to create, for each use of LOG_EVERY_N(), static
+// variables with the __LINE__ expansion as part of the variable name.
+#define LOG_EVERY_N_VARNAME(base, line) LOG_EVERY_N_VARNAME_CONCAT(base, line)
+#define LOG_EVERY_N_VARNAME_CONCAT(base, line) base ## line
+
+#define LOG_OCCURRENCES LOG_EVERY_N_VARNAME(occurrences_, __LINE__)
+#define LOG_OCCURRENCES_MOD_N LOG_EVERY_N_VARNAME(occurrences_mod_n_, __LINE__)
+
+#define SOME_KIND_OF_LOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_IF_EVERY_N(severity, condition, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (condition && \
+      ((LOG_OCCURRENCES_MOD_N=(LOG_OCCURRENCES_MOD_N + 1) % n) == (1 % n))) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+                 &what_to_do).stream()
+
+#define SOME_KIND_OF_PLOG_EVERY_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0, LOG_OCCURRENCES_MOD_N = 0; \
+  ++LOG_OCCURRENCES; \
+  if (++LOG_OCCURRENCES_MOD_N > n) LOG_OCCURRENCES_MOD_N -= n; \
+  if (LOG_OCCURRENCES_MOD_N == 1) \
+    google::ErrnoLogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+#define SOME_KIND_OF_LOG_FIRST_N(severity, n, what_to_do) \
+  static int LOG_OCCURRENCES = 0; \
+  if (LOG_OCCURRENCES <= n) \
+    ++LOG_OCCURRENCES; \
+  if (LOG_OCCURRENCES <= n) \
+    google::LogMessage( \
+        __FILE__, __LINE__, google::GLOG_ ## severity, LOG_OCCURRENCES, \
+        &what_to_do).stream()
+
+namespace glog_internal_namespace_ {
+template <bool>
+struct CompileAssert {
+};
+struct CrashReason;
+}  // namespace glog_internal_namespace_
+
+#define GOOGLE_GLOG_COMPILE_ASSERT(expr, msg) \
+  typedef google::glog_internal_namespace_::CompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+
+#define LOG_EVERY_N(severity, n)                                        \
+  GOOGLE_GLOG_COMPILE_ASSERT(google::GLOG_ ## severity < \
+                             google::NUM_SEVERITIES,     \
+                             INVALID_REQUESTED_LOG_SEVERITY);           \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
+
+#define SYSLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_LOG_EVERY_N(severity, (n), google::LogMessage::SendToSyslogAndLog)
+
+#define PLOG_EVERY_N(severity, n) \
+  SOME_KIND_OF_PLOG_EVERY_N(severity, (n), google::LogMessage::SendToLog)
+
+#define LOG_FIRST_N(severity, n) \
+  SOME_KIND_OF_LOG_FIRST_N(severity, (n), google::LogMessage::SendToLog)
+
+#define LOG_IF_EVERY_N(severity, condition, n) \
+  SOME_KIND_OF_LOG_IF_EVERY_N(severity, (condition), (n), google::LogMessage::SendToLog)
+
+// We want the special COUNTER value available for LOG_EVERY_X()'ed messages
+enum PRIVATE_Counter {COUNTER};
+
+#ifdef GLOG_NO_ABBREVIATED_SEVERITIES
+// wingdi.h defines ERROR to be 0. When we call LOG(ERROR), it gets
+// substituted with 0, and it expands to COMPACT_GOOGLE_LOG_0. To allow us
+// to keep using this syntax, we define this macro to do the same thing
+// as COMPACT_GOOGLE_LOG_ERROR.
+#define COMPACT_GOOGLE_LOG_0 COMPACT_GOOGLE_LOG_ERROR
+#define SYSLOG_0 SYSLOG_ERROR
+#define LOG_TO_STRING_0 LOG_TO_STRING_ERROR
+// Needed for LOG_IS_ON(ERROR).
+const LogSeverity GLOG_0 = GLOG_ERROR;
+#else
+// Users may include windows.h after logging.h without
+// GLOG_NO_ABBREVIATED_SEVERITIES nor WIN32_LEAN_AND_MEAN.
+// For this case, we cannot detect if ERROR is defined before users
+// actually use ERROR. Let's make an undefined symbol to warn users.
+# define GLOG_ERROR_MSG ERROR_macro_is_defined_Define_GLOG_NO_ABBREVIATED_SEVERITIES_before_including_logging_h_See_the_document_for_detail
+# define COMPACT_GOOGLE_LOG_0 GLOG_ERROR_MSG
+# define SYSLOG_0 GLOG_ERROR_MSG
+# define LOG_TO_STRING_0 GLOG_ERROR_MSG
+# define GLOG_0 GLOG_ERROR_MSG
+#endif
+
+// Plus some debug-logging macros that get compiled to nothing for production
+
+#ifndef NDEBUG
+
+#define DLOG(severity) LOG(severity)
+#define DVLOG(verboselevel) VLOG(verboselevel)
+#define DLOG_IF(severity, condition) LOG_IF(severity, condition)
+#define DLOG_EVERY_N(severity, n) LOG_EVERY_N(severity, n)
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  LOG_IF_EVERY_N(severity, condition, n)
+#define DLOG_ASSERT(condition) LOG_ASSERT(condition)
+
+// debug-only checking.  not executed in NDEBUG mode.
+#define DCHECK(condition) CHECK(condition)
+#define DCHECK_EQ(val1, val2) CHECK_EQ(val1, val2)
+#define DCHECK_NE(val1, val2) CHECK_NE(val1, val2)
+#define DCHECK_LE(val1, val2) CHECK_LE(val1, val2)
+#define DCHECK_LT(val1, val2) CHECK_LT(val1, val2)
+#define DCHECK_GE(val1, val2) CHECK_GE(val1, val2)
+#define DCHECK_GT(val1, val2) CHECK_GT(val1, val2)
+#define DCHECK_NOTNULL(val) CHECK_NOTNULL(val)
+#define DCHECK_STREQ(str1, str2) CHECK_STREQ(str1, str2)
+#define DCHECK_STRCASEEQ(str1, str2) CHECK_STRCASEEQ(str1, str2)
+#define DCHECK_STRNE(str1, str2) CHECK_STRNE(str1, str2)
+#define DCHECK_STRCASENE(str1, str2) CHECK_STRCASENE(str1, str2)
+
+#else  // NDEBUG
+
+#define DLOG(severity) \
+  true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DVLOG(verboselevel) \
+  (true || !VLOG_IS_ON(verboselevel)) ?\
+    (void) 0 : google::LogMessageVoidify() & LOG(INFO)
+
+#define DLOG_IF(severity, condition) \
+  (true || !(condition)) ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_EVERY_N(severity, n) \
+  true ? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_IF_EVERY_N(severity, condition, n) \
+  (true || !(condition))? (void) 0 : google::LogMessageVoidify() & LOG(severity)
+
+#define DLOG_ASSERT(condition) \
+  true ? (void) 0 : LOG_ASSERT(condition)
+
+// MSVC warning C4127: conditional expression is constant
+#define DCHECK(condition) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK(condition)
+
+#define DCHECK_EQ(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_EQ(val1, val2)
+
+#define DCHECK_NE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_NE(val1, val2)
+
+#define DCHECK_LE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LE(val1, val2)
+
+#define DCHECK_LT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_LT(val1, val2)
+
+#define DCHECK_GE(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GE(val1, val2)
+
+#define DCHECK_GT(val1, val2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_GT(val1, val2)
+
+// You may see warnings in release mode if you don't use the return
+// value of DCHECK_NOTNULL. Please just use DCHECK for such cases.
+#define DCHECK_NOTNULL(val) (val)
+
+#define DCHECK_STREQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STREQ(str1, str2)
+
+#define DCHECK_STRCASEEQ(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASEEQ(str1, str2)
+
+#define DCHECK_STRNE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRNE(str1, str2)
+
+#define DCHECK_STRCASENE(str1, str2) \
+  GLOG_MSVC_PUSH_DISABLE_WARNING(4127) \
+  while (false) \
+    GLOG_MSVC_POP_WARNING() CHECK_STRCASENE(str1, str2)
+
+#endif  // NDEBUG
+
+// Log only in verbose mode.
+
+#define VLOG(verboselevel) LOG_IF(INFO, VLOG_IS_ON(verboselevel))
+
+#define VLOG_IF(verboselevel, condition) \
+  LOG_IF(INFO, (condition) && VLOG_IS_ON(verboselevel))
+
+#define VLOG_EVERY_N(verboselevel, n) \
+  LOG_IF_EVERY_N(INFO, VLOG_IS_ON(verboselevel), n)
+
+#define VLOG_IF_EVERY_N(verboselevel, condition, n) \
+  LOG_IF_EVERY_N(INFO, (condition) && VLOG_IS_ON(verboselevel), n)
+
+namespace base_logging {
+
+// LogMessage::LogStream is a std::ostream backed by this streambuf.
+// This class ignores overflow and leaves two bytes at the end of the
+// buffer to allow for a '\n' and '\0'.
+class GOOGLE_GLOG_DLL_DECL LogStreamBuf : public std::streambuf {
+ public:
+  // REQUIREMENTS: "len" must be >= 2 to account for the '\n' and '\n'.
+  LogStreamBuf(char *buf, int len) {
+    setp(buf, buf + len - 2);
+  }
+  // This effectively ignores overflow.
+  virtual int_type overflow(int_type ch) {
+    return ch;
+  }
+
+  // Legacy public ostrstream method.
+  size_t pcount() const { return pptr() - pbase(); }
+  char* pbase() const { return std::streambuf::pbase(); }
+};
+
+}  // namespace base_logging
+
+//
+// This class more or less represents a particular log message.  You
+// create an instance of LogMessage and then stream stuff to it.
+// When you finish streaming to it, ~LogMessage is called and the
+// full message gets streamed to the appropriate destination.
+//
+// You shouldn't actually use LogMessage's constructor to log things,
+// though.  You should use the LOG() macro (and variants thereof)
+// above.
+class GOOGLE_GLOG_DLL_DECL LogMessage {
+public:
+  enum {
+    // Passing kNoLogPrefix for the line number disables the
+    // log-message prefix. Useful for using the LogMessage
+    // infrastructure as a printing utility. See also the --log_prefix
+    // flag for controlling the log-message prefix on an
+    // application-wide basis.
+    kNoLogPrefix = -1
+  };
+
+  // LogStream inherit from non-DLL-exported class (std::ostrstream)
+  // and VC++ produces a warning for this situation.
+  // However, MSDN says "C4275 can be ignored in Microsoft Visual C++
+  // 2005 if you are deriving from a type in the Standard C++ Library"
+  // http://msdn.microsoft.com/en-us/library/3tdb471s(VS.80).aspx
+  // Let's just ignore the warning.
+#ifdef _MSC_VER
+# pragma warning(disable: 4275)
+#endif
+  class GOOGLE_GLOG_DLL_DECL LogStream : public std::ostream {
+#ifdef _MSC_VER
+# pragma warning(default: 4275)
+#endif
+  public:
+    LogStream(char *buf, int len, int ctr)
+        : std::ostream(NULL),
+          streambuf_(buf, len),
+          ctr_(ctr),
+          self_(this) {
+      rdbuf(&streambuf_);
+    }
+
+    int ctr() const { return ctr_; }
+    void set_ctr(int ctr) { ctr_ = ctr; }
+    LogStream* self() const { return self_; }
+
+    // Legacy std::streambuf methods.
+    size_t pcount() const { return streambuf_.pcount(); }
+    char* pbase() const { return streambuf_.pbase(); }
+    char* str() const { return pbase(); }
+
+  private:
+    base_logging::LogStreamBuf streambuf_;
+    int ctr_;  // Counter hack (for the LOG_EVERY_X() macro)
+    LogStream *self_;  // Consistency check hack
+  };
+
+public:
+  // icc 8 requires this typedef to avoid an internal compiler error.
+  typedef void (LogMessage::*SendMethod)();
+
+  LogMessage(const char* file, int line, LogSeverity severity, int ctr,
+             SendMethod send_method);
+
+  // Two special constructors that generate reduced amounts of code at
+  // LOG call sites for common cases.
+
+  // Used for LOG(INFO): Implied are:
+  // severity = INFO, ctr = 0, send_method = &LogMessage::SendToLog.
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 19 bytes per call site.
+  LogMessage(const char* file, int line);
+
+  // Used for LOG(severity) where severity != INFO.  Implied
+  // are: ctr = 0, send_method = &LogMessage::SendToLog
+  //
+  // Using this constructor instead of the more complex constructor above
+  // saves 17 bytes per call site.
+  LogMessage(const char* file, int line, LogSeverity severity);
+
+  // Constructor to log this message to a specified sink (if not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SendToSinkAndLog if
+  // also_send_to_log is true, send_method = &LogMessage::SendToSink otherwise.
+  LogMessage(const char* file, int line, LogSeverity severity, LogSink* sink,
+             bool also_send_to_log);
+
+  // Constructor where we also give a vector<string> pointer
+  // for storing the messages (if the pointer is not NULL).
+  // Implied are: ctr = 0, send_method = &LogMessage::SaveOrSendToLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::vector<std::string>* outvec);
+
+  // Constructor where we also give a string pointer for storing the
+  // message (if the pointer is not NULL).  Implied are: ctr = 0,
+  // send_method = &LogMessage::WriteToStringAndLog.
+  LogMessage(const char* file, int line, LogSeverity severity,
+             std::string* message);
+
+  // A special constructor used for check failures
+  LogMessage(const char* file, int line, const CheckOpString& result);
+
+  ~LogMessage();
+
+  // Flush a buffered message to the sink set in the constructor.  Always
+  // called by the destructor, it may also be called from elsewhere if
+  // needed.  Only the first call is actioned; any later ones are ignored.
+  void Flush();
+
+  // An arbitrary limit on the length of a single log message.  This
+  // is so that streaming can be done more efficiently.
+  static const size_t kMaxLogMessageLen;
+
+  // Theses should not be called directly outside of logging.*,
+  // only passed as SendMethod arguments to other LogMessage methods:
+  void SendToLog();  // Actually dispatch to the logs
+  void SendToSyslogAndLog();  // Actually dispatch to syslog and the logs
+
+  // Call abort() or similar to perform LOG(FATAL) crash.
+  static void Fail() __attribute__ ((noreturn));
+
+  std::ostream& stream();
+
+  int preserved_errno() const;
+
+  // Must be called without the log_mutex held.  (L < log_mutex)
+  static int64 num_messages(int severity);
+
+  struct LogMessageData;
+
+private:
+  // Fully internal SendMethod cases:
+  void SendToSinkAndLog();  // Send to sink if provided and dispatch to the logs
+  void SendToSink();  // Send to sink if provided, do nothing otherwise.
+
+  // Write to string if provided and dispatch to the logs.
+  void WriteToStringAndLog();
+
+  void SaveOrSendToLog();  // Save to stringvec if provided, else to logs
+
+  void Init(const char* file, int line, LogSeverity severity,
+            void (LogMessage::*send_method)());
+
+  // Used to fill in crash information during LOG(FATAL) failures.
+  void RecordCrashReason(glog_internal_namespace_::CrashReason* reason);
+
+  // Counts of messages sent at each priority:
+  static int64 num_messages_[NUM_SEVERITIES];  // under log_mutex
+
+  // We keep the data in a separate struct so that each instance of
+  // LogMessage uses less stack space.
+  LogMessageData* allocated_;
+  LogMessageData* data_;
+
+  friend class LogDestination;
+
+  LogMessage(const LogMessage&);
+  void operator=(const LogMessage&);
+};
+
+// This class happens to be thread-hostile because all instances share
+// a single data buffer, but since it can only be created just before
+// the process dies, we don't worry so much.
+class GOOGLE_GLOG_DLL_DECL LogMessageFatal : public LogMessage {
+ public:
+  LogMessageFatal(const char* file, int line);
+  LogMessageFatal(const char* file, int line, const CheckOpString& result);
+  ~LogMessageFatal() __attribute__ ((noreturn));
+};
+
+// A non-macro interface to the log facility; (useful
+// when the logging level is not a compile-time constant).
+inline void LogAtLevel(int const severity, std::string const &msg) {
+  LogMessage(__FILE__, __LINE__, severity).stream() << msg;
+}
+
+// A macro alternative of LogAtLevel. New code may want to use this
+// version since there are two advantages: 1. this version outputs the
+// file name and the line number where this macro is put like other
+// LOG macros, 2. this macro can be used as C++ stream.
+#define LOG_AT_LEVEL(severity) google::LogMessage(__FILE__, __LINE__, severity).stream()
+
+// A small helper for CHECK_NOTNULL().
+template <typename T>
+T* CheckNotNull(const char *file, int line, const char *names, T* t) {
+  if (t == NULL) {
+    LogMessageFatal(file, line, new std::string(names));
+  }
+  return t;
+}
+
+// Allow folks to put a counter in the LOG_EVERY_X()'ed messages. This
+// only works if ostream is a LogStream. If the ostream is not a
+// LogStream you'll get an assert saying as much at runtime.
+GOOGLE_GLOG_DLL_DECL std::ostream& operator<<(std::ostream &os,
+                                              const PRIVATE_Counter&);
+
+
+// Derived class for PLOG*() above.
+class GOOGLE_GLOG_DLL_DECL ErrnoLogMessage : public LogMessage {
+ public:
+
+  ErrnoLogMessage(const char* file, int line, LogSeverity severity, int ctr,
+                  void (LogMessage::*send_method)());
+
+  // Postpends ": strerror(errno) [errno]".
+  ~ErrnoLogMessage();
+
+ private:
+  ErrnoLogMessage(const ErrnoLogMessage&);
+  void operator=(const ErrnoLogMessage&);
+};
+
+
+// This class is used to explicitly ignore values in the conditional
+// logging macros.  This avoids compiler warnings like "value computed
+// is not used" and "statement has no effect".
+
+class GOOGLE_GLOG_DLL_DECL LogMessageVoidify {
+ public:
+  LogMessageVoidify() { }
+  // This has to be an operator with a precedence lower than << but
+  // higher than ?:
+  void operator&(std::ostream&) { }
+};
+
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void FlushLogFiles(LogSeverity min_severity);
+
+// Flushes all log files that contains messages that are at least of
+// the specified severity level. Thread-hostile because it ignores
+// locking -- used for catastrophic failures.
+GOOGLE_GLOG_DLL_DECL void FlushLogFilesUnsafe(LogSeverity min_severity);
+
+//
+// Set the destination to which a particular severity level of log
+// messages is sent.  If base_filename is "", it means "don't log this
+// severity".  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogDestination(LogSeverity severity,
+                                            const char* base_filename);
+
+//
+// Set the basename of the symlink to the latest log file at a given
+// severity.  If symlink_basename is empty, do not make a symlink.  If
+// you don't call this function, the symlink basename is the
+// invocation name of the program.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogSymlink(LogSeverity severity,
+                                        const char* symlink_basename);
+
+//
+// Used to send logs to some other kind of destination
+// Users should subclass LogSink and override send to do whatever they want.
+// Implementations must be thread-safe because a shared instance will
+// be called from whichever thread ran the LOG(XXX) line.
+class GOOGLE_GLOG_DLL_DECL LogSink {
+ public:
+  virtual ~LogSink();
+
+  // Sink's logging logic (message_len is such as to exclude '\n' at the end).
+  // This method can't use LOG() or CHECK() as logging system mutex(s) are held
+  // during this call.
+  virtual void send(LogSeverity severity, const char* full_filename,
+                    const char* base_filename, int line,
+                    const struct ::tm* tm_time,
+                    const char* message, size_t message_len) = 0;
+
+  // Redefine this to implement waiting for
+  // the sink's logging logic to complete.
+  // It will be called after each send() returns,
+  // but before that LogMessage exits or crashes.
+  // By default this function does nothing.
+  // Using this function one can implement complex logic for send()
+  // that itself involves logging; and do all this w/o causing deadlocks and
+  // inconsistent rearrangement of log messages.
+  // E.g. if a LogSink has thread-specific actions, the send() method
+  // can simply add the message to a queue and wake up another thread that
+  // handles real logging while itself making some LOG() calls;
+  // WaitTillSent() can be implemented to wait for that logic to complete.
+  // See our unittest for an example.
+  virtual void WaitTillSent();
+
+  // Returns the normal text output of the log message.
+  // Can be useful to implement send().
+  static std::string ToString(LogSeverity severity, const char* file, int line,
+                              const struct ::tm* tm_time,
+                              const char* message, size_t message_len);
+};
+
+// Add or remove a LogSink as a consumer of logging data.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL void AddLogSink(LogSink *destination);
+GOOGLE_GLOG_DLL_DECL void RemoveLogSink(LogSink *destination);
+
+//
+// Specify an "extension" added to the filename specified via
+// SetLogDestination.  This applies to all severity levels.  It's
+// often used to append the port we're listening on to the logfile
+// name.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetLogFilenameExtension(
+    const char* filename_extension);
+
+//
+// Make it so that all log messages of at least a particular severity
+// are logged to stderr (in addition to logging to the usual log
+// file(s)).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetStderrLogging(LogSeverity min_severity);
+
+//
+// Make it so that all log messages go only to stderr.  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void LogToStderr();
+
+//
+// Make it so that all log messages of at least a particular severity are
+// logged via email to a list of addresses (in addition to logging to the
+// usual log file(s)).  The list of addresses is just a string containing
+// the email addresses to send to (separated by spaces, say).  Thread-safe.
+//
+GOOGLE_GLOG_DLL_DECL void SetEmailLogging(LogSeverity min_severity,
+                                          const char* addresses);
+
+// A simple function that sends email. dest is a commma-separated
+// list of addressess.  Thread-safe.
+GOOGLE_GLOG_DLL_DECL bool SendEmail(const char *dest,
+                                    const char *subject, const char *body);
+
+GOOGLE_GLOG_DLL_DECL const std::vector<std::string>& GetLoggingDirectories();
+
+// For tests only:  Clear the internal [cached] list of logging directories to
+// force a refresh the next time GetLoggingDirectories is called.
+// Thread-hostile.
+void TestOnly_ClearLoggingDirectoriesList();
+
+// Returns a set of existing temporary directories, which will be a
+// subset of the directories returned by GetLogginDirectories().
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL void GetExistingTempDirectories(
+    std::vector<std::string>* list);
+
+// Print any fatal message again -- useful to call from signal handler
+// so that the last thing in the output is the fatal message.
+// Thread-hostile, but a race is unlikely.
+GOOGLE_GLOG_DLL_DECL void ReprintFatalMessage();
+
+// Truncate a log file that may be the append-only output of multiple
+// processes and hence can't simply be renamed/reopened (typically a
+// stdout/stderr).  If the file "path" is > "limit" bytes, copy the
+// last "keep" bytes to offset 0 and truncate the rest. Since we could
+// be racing with other writers, this approach has the potential to
+// lose very small amounts of data. For security, only follow symlinks
+// if the path is /proc/self/fd/*
+GOOGLE_GLOG_DLL_DECL void TruncateLogFile(const char *path,
+                                          int64 limit, int64 keep);
+
+// Truncate stdout and stderr if they are over the value specified by
+// --max_log_size; keep the final 1MB.  This function has the same
+// race condition as TruncateLogFile.
+GOOGLE_GLOG_DLL_DECL void TruncateStdoutStderr();
+
+// Return the string representation of the provided LogSeverity level.
+// Thread-safe.
+GOOGLE_GLOG_DLL_DECL const char* GetLogSeverityName(LogSeverity severity);
+
+// ---------------------------------------------------------------------
+// Implementation details that are not useful to most clients
+// ---------------------------------------------------------------------
+
+// A Logger is the interface used by logging modules to emit entries
+// to a log.  A typical implementation will dump formatted data to a
+// sequence of files.  We also provide interfaces that will forward
+// the data to another thread so that the invoker never blocks.
+// Implementations should be thread-safe since the logging system
+// will write to them from multiple threads.
+
+namespace base {
+
+class GOOGLE_GLOG_DLL_DECL Logger {
+ public:
+  virtual ~Logger();
+
+  // Writes "message[0,message_len-1]" corresponding to an event that
+  // occurred at "timestamp".  If "force_flush" is true, the log file
+  // is flushed immediately.
+  //
+  // The input message has already been formatted as deemed
+  // appropriate by the higher level logging facility.  For example,
+  // textual log messages already contain timestamps, and the
+  // file:linenumber header.
+  virtual void Write(bool force_flush,
+                     time_t timestamp,
+                     const char* message,
+                     int message_len) = 0;
+
+  // Flush any buffered messages
+  virtual void Flush() = 0;
+
+  // Get the current LOG file size.
+  // The returned value is approximate since some
+  // logged data may not have been flushed to disk yet.
+  virtual uint32 LogSize() = 0;
+};
+
+// Get the logger for the specified severity level.  The logger
+// remains the property of the logging module and should not be
+// deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL Logger* GetLogger(LogSeverity level);
+
+// Set the logger for the specified severity level.  The logger
+// becomes the property of the logging module and should not
+// be deleted by the caller.  Thread-safe.
+extern GOOGLE_GLOG_DLL_DECL void SetLogger(LogSeverity level, Logger* logger);
+
+}
+
+// glibc has traditionally implemented two incompatible versions of
+// strerror_r(). There is a poorly defined convention for picking the
+// version that we want, but it is not clear whether it even works with
+// all versions of glibc.
+// So, instead, we provide this wrapper that automatically detects the
+// version that is in use, and then implements POSIX semantics.
+// N.B. In addition to what POSIX says, we also guarantee that "buf" will
+// be set to an empty string, if this function failed. This means, in most
+// cases, you do not need to check the error code and you can directly
+// use the value of "buf". It will never have an undefined value.
+// DEPRECATED: Use StrError(int) instead.
+GOOGLE_GLOG_DLL_DECL int posix_strerror_r(int err, char *buf, size_t len);
+
+// A thread-safe replacement for strerror(). Returns a string describing the
+// given POSIX error code.
+GOOGLE_GLOG_DLL_DECL std::string StrError(int err);
+
+// A class for which we define operator<<, which does nothing.
+class GOOGLE_GLOG_DLL_DECL NullStream : public LogMessage::LogStream {
+ public:
+  // Initialize the LogStream so the messages can be written somewhere
+  // (they'll never be actually displayed). This will be needed if a
+  // NullStream& is implicitly converted to LogStream&, in which case
+  // the overloaded NullStream::operator<< will not be invoked.
+  NullStream() : LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream(const char* /*file*/, int /*line*/,
+             const CheckOpString& /*result*/) :
+      LogMessage::LogStream(message_buffer_, 1, 0) { }
+  NullStream &stream() { return *this; }
+ private:
+  // A very short buffer for messages (which we discard anyway). This
+  // will be needed if NullStream& converted to LogStream& (e.g. as a
+  // result of a conditional expression).
+  char message_buffer_[2];
+};
+
+// Do nothing. This operator is inline, allowing the message to be
+// compiled away. The message will not be compiled away if we do
+// something like (flag ? LOG(INFO) : LOG(ERROR)) << message; when
+// SKIP_LOG=WARNING. In those cases, NullStream will be implicitly
+// converted to LogStream and the message will be computed and then
+// quietly discarded.
+template<class T>
+inline NullStream& operator<<(NullStream &str, const T &) { return str; }
+
+// Similar to NullStream, but aborts the program (without stack
+// trace), like LogMessageFatal.
+class GOOGLE_GLOG_DLL_DECL NullStreamFatal : public NullStream {
+ public:
+  NullStreamFatal() { }
+  NullStreamFatal(const char* file, int line, const CheckOpString& result) :
+      NullStream(file, line, result) { }
+  __attribute__ ((noreturn)) ~NullStreamFatal() { _exit(1); }
+};
+
+// Install a signal handler that will dump signal information and a stack
+// trace when the program crashes on certain signals.  We'll install the
+// signal handler for the following signals.
+//
+// SIGSEGV, SIGILL, SIGFPE, SIGABRT, SIGBUS, and SIGTERM.
+//
+// By default, the signal handler will write the failure dump to the
+// standard error.  You can customize the destination by installing your
+// own writer function by InstallFailureWriter() below.
+//
+// Note on threading:
+//
+// The function should be called before threads are created, if you want
+// to use the failure signal handler for all threads.  The stack trace
+// will be shown only for the thread that receives the signal.  In other
+// words, stack traces of other threads won't be shown.
+GOOGLE_GLOG_DLL_DECL void InstallFailureSignalHandler();
+
+// Installs a function that is used for writing the failure dump.  "data"
+// is the pointer to the beginning of a message to be written, and "size"
+// is the size of the message.  You should not expect the data is
+// terminated with '\0'.
+GOOGLE_GLOG_DLL_DECL void InstallFailureWriter(
+    void (*writer)(const char* data, int size));
+
+}
+
+#endif // _LOGGING_H_
diff --git a/include/glog/raw_logging.h b/include/glog/raw_logging.h
new file mode 100644
index 0000000..65278f6
--- /dev/null
+++ b/include/glog/raw_logging.h
@@ -0,0 +1,185 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Maxim Lifantsev
+//
+// Thread-safe logging routines that do not allocate any memory or
+// acquire any locks, and can therefore be used by low-level memory
+// allocation and synchronization code.
+
+#ifndef BASE_RAW_LOGGING_H_
+#define BASE_RAW_LOGGING_H_
+
+#include <time.h>
+
+namespace google {
+
+#include "glog/log_severity.h"
+#include "glog/vlog_is_on.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+// This is similar to LOG(severity) << format... and VLOG(level) << format..,
+// but
+// * it is to be used ONLY by low-level modules that can't use normal LOG()
+// * it is desiged to be a low-level logger that does not allocate any
+//   memory and does not need any locks, hence:
+// * it logs straight and ONLY to STDERR w/o buffering
+// * it uses an explicit format and arguments list
+// * it will silently chop off really long message strings
+// Usage example:
+//   RAW_LOG(ERROR, "Failed foo with %i: %s", status, error);
+//   RAW_VLOG(3, "status is %i", status);
+// These will print an almost standard log lines like this to stderr only:
+//   E0821 211317 file.cc:123] RAW: Failed foo with 22: bad_file
+//   I0821 211317 file.cc:142] RAW: status is 20
+#define RAW_LOG(severity, ...) \
+  do { \
+    switch (google::GLOG_ ## severity) {  \
+      case 0: \
+        RAW_LOG_INFO(__VA_ARGS__); \
+        break; \
+      case 1: \
+        RAW_LOG_WARNING(__VA_ARGS__); \
+        break; \
+      case 2: \
+        RAW_LOG_ERROR(__VA_ARGS__); \
+        break; \
+      case 3: \
+        RAW_LOG_FATAL(__VA_ARGS__); \
+        break; \
+      default: \
+        break; \
+    } \
+  } while (0)
+
+// The following STRIP_LOG testing is performed in the header file so that it's
+// possible to completely compile out the logging code and the log messages.
+#if STRIP_LOG == 0
+#define RAW_VLOG(verboselevel, ...) \
+  do { \
+    if (VLOG_IS_ON(verboselevel)) { \
+      RAW_LOG_INFO(__VA_ARGS__); \
+    } \
+  } while (0)
+#else
+#define RAW_VLOG(verboselevel, ...) RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG == 0
+#define RAW_LOG_INFO(...) google::RawLog__(google::GLOG_INFO, \
+                                   __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_INFO(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG == 0
+
+#if STRIP_LOG <= 1
+#define RAW_LOG_WARNING(...) google::RawLog__(google::GLOG_WARNING,   \
+                                      __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_WARNING(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 1
+
+#if STRIP_LOG <= 2
+#define RAW_LOG_ERROR(...) google::RawLog__(google::GLOG_ERROR,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_ERROR(...) google::RawLogStub__(0, __VA_ARGS__)
+#endif // STRIP_LOG <= 2
+
+#if STRIP_LOG <= 3
+#define RAW_LOG_FATAL(...) google::RawLog__(google::GLOG_FATAL,       \
+                                    __FILE__, __LINE__, __VA_ARGS__)
+#else
+#define RAW_LOG_FATAL(...) \
+  do { \
+    google::RawLogStub__(0, __VA_ARGS__);        \
+    exit(1); \
+  } while (0)
+#endif // STRIP_LOG <= 3
+
+// Similar to CHECK(condition) << message,
+// but for low-level modules: we use only RAW_LOG that does not allocate memory.
+// We do not want to provide args list here to encourage this usage:
+//   if (!cond)  RAW_LOG(FATAL, "foo ...", hard_to_compute_args);
+// so that the args are not computed when not needed.
+#define RAW_CHECK(condition, message)                                   \
+  do {                                                                  \
+    if (!(condition)) {                                                 \
+      RAW_LOG(FATAL, "Check %s failed: %s", #condition, message);       \
+    }                                                                   \
+  } while (0)
+
+// Debug versions of RAW_LOG and RAW_CHECK
+#ifndef NDEBUG
+
+#define RAW_DLOG(severity, ...) RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) RAW_CHECK(condition, message)
+
+#else  // NDEBUG
+
+#define RAW_DLOG(severity, ...)                                 \
+  while (false)                                                 \
+    RAW_LOG(severity, __VA_ARGS__)
+#define RAW_DCHECK(condition, message) \
+  while (false) \
+    RAW_CHECK(condition, message)
+
+#endif  // NDEBUG
+
+// Stub log function used to work around for unused variable warnings when
+// building with STRIP_LOG > 0.
+static inline void RawLogStub__(int /* ignored */, ...) {
+}
+
+// Helper function to implement RAW_LOG and RAW_VLOG
+// Logs format... at "severity" level, reporting it
+// as called from file:line.
+// This does not allocate memory or acquire locks.
+GOOGLE_GLOG_DLL_DECL void RawLog__(LogSeverity severity,
+                                   const char* file,
+                                   int line,
+                                   const char* format, ...)
+   __attribute__((__format__ (__printf__, 4, 5)));
+
+// Hack to propagate time information into this module so that
+// this module does not have to directly call localtime_r(),
+// which could allocate memory.
+GOOGLE_GLOG_DLL_DECL void RawLog__SetLastTime(const struct tm& t, int usecs);
+
+}
+
+#endif  // BASE_RAW_LOGGING_H_
diff --git a/include/glog/stl_logging.h b/include/glog/stl_logging.h
new file mode 100644
index 0000000..40a15aa
--- /dev/null
+++ b/include/glog/stl_logging.h
@@ -0,0 +1,220 @@
+// Copyright (c) 2003, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Stream output operators for STL containers; to be used for logging *only*.
+// Inclusion of this file lets you do:
+//
+// list<string> x;
+// LOG(INFO) << "data: " << x;
+// vector<int> v1, v2;
+// CHECK_EQ(v1, v2);
+//
+// If you want to use this header file with hash maps or slist, you
+// need to define macros before including this file:
+//
+// - GLOG_STL_LOGGING_FOR_UNORDERED     - <unordered_map> and <unordered_set>
+// - GLOG_STL_LOGGING_FOR_TR1_UNORDERED - <tr1/unordered_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_HASH      - <ext/hash_(map|set)>
+// - GLOG_STL_LOGGING_FOR_EXT_SLIST     - <ext/slist>
+//
+
+#ifndef UTIL_GTL_STL_LOGGING_INL_H_
+#define UTIL_GTL_STL_LOGGING_INL_H_
+
+#if !1
+# error We do not support stl_logging for this compiler
+#endif
+
+#include <deque>
+#include <list>
+#include <map>
+#include <ostream>
+#include <set>
+#include <utility>
+#include <vector>
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+# include <unordered_map>
+# include <unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+# include <tr1/unordered_map>
+# include <tr1/unordered_set>
+#endif
+
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+# include <ext/hash_set>
+# include <ext/hash_map>
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+# include <ext/slist>
+#endif
+
+// Forward declare these two, and define them after all the container streams
+// operators so that we can recurse from pair -> container -> container -> pair
+// properly.
+template<class First, class Second>
+std::ostream& operator<<(std::ostream& out, const std::pair<First, Second>& p);
+
+namespace google {
+
+template<class Iter>
+void PrintSequence(std::ostream& out, Iter begin, Iter end);
+
+}
+
+#define OUTPUT_TWO_ARG_CONTAINER(Sequence) \
+template<class T1, class T2> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_TWO_ARG_CONTAINER(std::vector)
+OUTPUT_TWO_ARG_CONTAINER(std::deque)
+OUTPUT_TWO_ARG_CONTAINER(std::list)
+#ifdef GLOG_STL_LOGGING_FOR_EXT_SLIST
+OUTPUT_TWO_ARG_CONTAINER(__gnu_cxx::slist)
+#endif
+
+#undef OUTPUT_TWO_ARG_CONTAINER
+
+#define OUTPUT_THREE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_THREE_ARG_CONTAINER(std::set)
+OUTPUT_THREE_ARG_CONTAINER(std::multiset)
+
+#undef OUTPUT_THREE_ARG_CONTAINER
+
+#define OUTPUT_FOUR_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+OUTPUT_FOUR_ARG_CONTAINER(std::map)
+OUTPUT_FOUR_ARG_CONTAINER(std::multimap)
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_set)
+OUTPUT_FOUR_ARG_CONTAINER(std::tr1::unordered_multiset)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_set)
+OUTPUT_FOUR_ARG_CONTAINER(__gnu_cxx::hash_multiset)
+#endif
+
+#undef OUTPUT_FOUR_ARG_CONTAINER
+
+#define OUTPUT_FIVE_ARG_CONTAINER(Sequence) \
+template<class T1, class T2, class T3, class T4, class T5> \
+inline std::ostream& operator<<(std::ostream& out, \
+                                const Sequence<T1, T2, T3, T4, T5>& seq) { \
+  google::PrintSequence(out, seq.begin(), seq.end()); \
+  return out; \
+}
+
+#ifdef GLOG_STL_LOGGING_FOR_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_TR1_UNORDERED
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_map)
+OUTPUT_FIVE_ARG_CONTAINER(std::tr1::unordered_multimap)
+#endif
+#ifdef GLOG_STL_LOGGING_FOR_EXT_HASH
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_map)
+OUTPUT_FIVE_ARG_CONTAINER(__gnu_cxx::hash_multimap)
+#endif
+
+#undef OUTPUT_FIVE_ARG_CONTAINER
+
+template<class First, class Second>
+inline std::ostream& operator<<(std::ostream& out,
+                                const std::pair<First, Second>& p) {
+  out << '(' << p.first << ", " << p.second << ')';
+  return out;
+}
+
+namespace google {
+
+template<class Iter>
+inline void PrintSequence(std::ostream& out, Iter begin, Iter end) {
+  // Output at most 100 elements -- appropriate if used for logging.
+  for (int i = 0; begin != end && i < 100; ++i, ++begin) {
+    if (i > 0) out << ' ';
+    out << *begin;
+  }
+  if (begin != end) {
+    out << " ...";
+  }
+}
+
+}
+
+// Note that this is technically undefined behavior! We are adding things into
+// the std namespace for a reason though -- we are providing new operations on
+// types which are themselves defined with this namespace. Without this, these
+// operator overloads cannot be found via ADL. If these definitions are not
+// found via ADL, they must be #included before they're used, which requires
+// this header to be included before apparently independent other headers.
+//
+// For example, base/logging.h defines various template functions to implement
+// CHECK_EQ(x, y) and stream x and y into the log in the event the check fails.
+// It does so via the function template MakeCheckOpValueString:
+//   template<class T>
+//   void MakeCheckOpValueString(strstream* ss, const T& v) {
+//     (*ss) << v;
+//   }
+// Because 'glog/logging.h' is included before 'glog/stl_logging.h',
+// subsequent CHECK_EQ(v1, v2) for vector<...> typed variable v1 and v2 can only
+// find these operator definitions via ADL.
+//
+// Even this solution has problems -- it may pull unintended operators into the
+// namespace as well, allowing them to also be found via ADL, and creating code
+// that only works with a particular order of includes. Long term, we need to
+// move all of the *definitions* into namespace std, bet we need to ensure no
+// one references them first. This lets us take that step. We cannot define them
+// in both because that would create ambiguous overloads when both are found.
+namespace std { using ::operator<<; }
+
+#endif  // UTIL_GTL_STL_LOGGING_INL_H_
diff --git a/include/glog/vlog_is_on.h b/include/glog/vlog_is_on.h
new file mode 100644
index 0000000..02b0b86
--- /dev/null
+++ b/include/glog/vlog_is_on.h
@@ -0,0 +1,129 @@
+// Copyright (c) 1999, 2007, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Author: Ray Sidney and many others
+//
+// Defines the VLOG_IS_ON macro that controls the variable-verbosity
+// conditional logging.
+//
+// It's used by VLOG and VLOG_IF in logging.h
+// and by RAW_VLOG in raw_logging.h to trigger the logging.
+//
+// It can also be used directly e.g. like this:
+//   if (VLOG_IS_ON(2)) {
+//     // do some logging preparation and logging
+//     // that can't be accomplished e.g. via just VLOG(2) << ...;
+//   }
+//
+// The truth value that VLOG_IS_ON(level) returns is determined by 
+// the three verbosity level flags:
+//   --v=<n>  Gives the default maximal active V-logging level;
+//            0 is the default.
+//            Normally positive values are used for V-logging levels.
+//   --vmodule=<str>  Gives the per-module maximal V-logging levels to override
+//                    the value given by --v.
+//                    E.g. "my_module=2,foo*=3" would change the logging level
+//                    for all code in source files "my_module.*" and "foo*.*"
+//                    ("-inl" suffixes are also disregarded for this matching).
+//
+// SetVLOGLevel helper function is provided to do limited dynamic control over
+// V-logging by overriding the per-module settings given via --vmodule flag.
+//
+// CAVEAT: --vmodule functionality is not available in non gcc compilers.
+//
+
+#ifndef BASE_VLOG_IS_ON_H_
+#define BASE_VLOG_IS_ON_H_
+
+#include "glog/log_severity.h"
+
+// Annoying stuff for windows -- makes sure clients can import these functions
+#ifndef GOOGLE_GLOG_DLL_DECL
+# if defined(_WIN32) && !defined(__CYGWIN__)
+#   define GOOGLE_GLOG_DLL_DECL  __declspec(dllimport)
+# else
+#   define GOOGLE_GLOG_DLL_DECL
+# endif
+#endif
+
+#if defined(__GNUC__)
+// We emit an anonymous static int* variable at every VLOG_IS_ON(n) site.
+// (Normally) the first time every VLOG_IS_ON(n) site is hit,
+// we determine what variable will dynamically control logging at this site:
+// it's either FLAGS_v or an appropriate internal variable
+// matching the current source file that represents results of
+// parsing of --vmodule flag and/or SetVLOGLevel calls.
+#define VLOG_IS_ON(verboselevel)                                \
+  __extension__  \
+  ({ static google::int32* vlocal__ = &google::kLogSiteUninitialized;           \
+     google::int32 verbose_level__ = (verboselevel);                    \
+     (*vlocal__ >= verbose_level__) &&                          \
+     ((vlocal__ != &google::kLogSiteUninitialized) ||                   \
+      (google::InitVLOG3__(&vlocal__, &FLAGS_v,                         \
+                   __FILE__, verbose_level__))); })
+#else
+// GNU extensions not available, so we do not support --vmodule.
+// Dynamic value of FLAGS_v always controls the logging level.
+#define VLOG_IS_ON(verboselevel) (FLAGS_v >= (verboselevel))
+#endif
+
+// Set VLOG(_IS_ON) level for module_pattern to log_level.
+// This lets us dynamically control what is normally set by the --vmodule flag.
+// Returns the level that previously applied to module_pattern.
+// NOTE: To change the log level for VLOG(_IS_ON) sites
+//	 that have already executed after/during InitGoogleLogging,
+//	 one needs to supply the exact --vmodule pattern that applied to them.
+//       (If no --vmodule pattern applied to them
+//       the value of FLAGS_v will continue to control them.)
+extern GOOGLE_GLOG_DLL_DECL int SetVLOGLevel(const char* module_pattern,
+                                             int log_level);
+
+// Various declarations needed for VLOG_IS_ON above: =========================
+
+// Special value used to indicate that a VLOG_IS_ON site has not been
+// initialized.  We make this a large value, so the common-case check
+// of "*vlocal__ >= verbose_level__" in VLOG_IS_ON definition
+// passes in such cases and InitVLOG3__ is then triggered.
+extern google::int32 kLogSiteUninitialized;
+
+// Helper routine which determines the logging info for a particalur VLOG site.
+//   site_flag     is the address of the site-local pointer to the controlling
+//                 verbosity level
+//   site_default  is the default to use for *site_flag
+//   fname         is the current source file name
+//   verbose_level is the argument to VLOG_IS_ON
+// We will return the return value for VLOG_IS_ON
+// and if possible set *site_flag appropriately.
+extern GOOGLE_GLOG_DLL_DECL bool InitVLOG3__(
+    google::int32** site_flag,
+    google::int32* site_default,
+    const char* fname,
+    google::int32 verbose_level);
+
+#endif  // BASE_VLOG_IS_ON_H_
diff --git a/lib/libglog.a b/lib/libglog.a
new file mode 100644
index 0000000..ae51647
--- /dev/null
+++ b/lib/libglog.a
Binary files differ
diff --git a/lib/libglog.la b/lib/libglog.la
new file mode 100755
index 0000000..bf7e5c0
--- /dev/null
+++ b/lib/libglog.la
@@ -0,0 +1,41 @@
+# libglog.la - a libtool library file
+# Generated by libtool (GNU libtool) 2.4.2 Debian-2.4.2-1ubuntu1
+#
+# Please DO NOT delete this file!
+# It is necessary for linking the library.
+
+# The name that we can dlopen(3).
+dlname='libglog.so.0'
+
+# Names of this library.
+library_names='libglog.so.0.0.0 libglog.so.0 libglog.so'
+
+# The name of the static archive.
+old_library='libglog.a'
+
+# Linker flags that can not go in dependency_libs.
+inherited_linker_flags=''
+
+# Libraries that this one depends upon.
+dependency_libs=' -L/tmp/libglog-chaorenl/gcc/lib/gcc/x86_64-linux/4.8 -L/tmp/libglog-chaorenl/gcc/x86_64-linux/lib64 -lpthread'
+
+# Names of additional weak libraries provided by this library
+weak_library_names=''
+
+# Version information for libglog.
+current=0
+age=0
+revision=0
+
+# Is this an already installed library?
+installed=yes
+
+# Should we warn about portability when linking against -modules?
+shouldnotlink=no
+
+# Files to dlopen/dlpreopen
+dlopen=''
+dlpreopen=''
+
+# Directory that this library needs to be installed in:
+libdir='/tmp/libglog-chaorenl/install/lib'
diff --git a/lib/libglog.so b/lib/libglog.so
new file mode 120000
index 0000000..e23402b
--- /dev/null
+++ b/lib/libglog.so
@@ -0,0 +1 @@
+libglog.so.0.0.0
\ No newline at end of file
diff --git a/lib/libglog.so.0 b/lib/libglog.so.0
new file mode 120000
index 0000000..e23402b
--- /dev/null
+++ b/lib/libglog.so.0
@@ -0,0 +1 @@
+libglog.so.0.0.0
\ No newline at end of file
diff --git a/lib/libglog.so.0.0.0 b/lib/libglog.so.0.0.0
new file mode 100755
index 0000000..4733e00
--- /dev/null
+++ b/lib/libglog.so.0.0.0
Binary files differ
diff --git a/lib/pkgconfig/libglog.pc b/lib/pkgconfig/libglog.pc
new file mode 100644
index 0000000..6679664
--- /dev/null
+++ b/lib/pkgconfig/libglog.pc
@@ -0,0 +1,10 @@
+prefix=/tmp/libglog-chaorenl/install
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: libglog
+Description: Google Log (glog) C++ logging framework
+Version: 0.3.4
+Libs: -L${libdir} -lglog
+Cflags: -I${includedir}
diff --git a/share/doc/glog-0.3.4/AUTHORS b/share/doc/glog-0.3.4/AUTHORS
new file mode 100644
index 0000000..ee92be8
--- /dev/null
+++ b/share/doc/glog-0.3.4/AUTHORS
@@ -0,0 +1,2 @@
+opensource@google.com
+
diff --git a/share/doc/glog-0.3.4/COPYING b/share/doc/glog-0.3.4/COPYING
new file mode 100644
index 0000000..38396b5
--- /dev/null
+++ b/share/doc/glog-0.3.4/COPYING
@@ -0,0 +1,65 @@
+Copyright (c) 2008, Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+A function gettimeofday in utilities.cc is based on
+
+http://www.google.com/codesearch/p?hl=en#dR3YEbitojA/COPYING&q=GetSystemTimeAsFileTime%20license:bsd
+
+The license of this code is:
+
+Copyright (c) 2003-2008, Jouni Malinen <j@w1.fi> and contributors
+All Rights Reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. Neither the name(s) of the above-listed copyright holder(s) nor the
+   names of its contributors may be used to endorse or promote products
+   derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/share/doc/glog-0.3.4/ChangeLog b/share/doc/glog-0.3.4/ChangeLog
new file mode 100644
index 0000000..d1b4248
--- /dev/null
+++ b/share/doc/glog-0.3.4/ChangeLog
@@ -0,0 +1,84 @@
+2013-02-01  Google Inc. <opensource@google.com>
+
+	* google-glog: version 0.3.3
+	* Add --disable-rtti option for configure.
+	* Visual Studio build and test fix.
+	* QNX build fix (thanks vanuan).
+	* Reduce warnings.
+	* Fixed LOG_SYSRESULT (thanks ukai).
+	* FreeBSD build fix (thanks yyanagisawa).
+	* Clang build fix.
+	* Now users can re-initialize glog after ShutdownGoogleLogging.
+	* Color output support by GLOG_colorlogtostderr (thanks alexs).
+	* Now glog's ABI around flags are compatible with gflags.
+	* Document mentions how to modify flags from user programs.
+
+2012-01-12  Google Inc. <opensource@google.com>
+
+	* google-glog: version 0.3.2
+	* Clang support.
+	* Demangler and stacktrace improvement for newer GCCs.
+	* Now fork(2) doesn't mess up log files.
+	* Make valgrind happier.
+	* Reduce warnings for more -W options.
+	* Provide a workaround for ERROR defined by windows.h.
+
+2010-06-15  Google Inc. <opensource@google.com>
+
+	* google-glog: version 0.3.1
+	* GLOG_* environment variables now work even when gflags is installed.
+	* Snow leopard support.
+	* Now we can build and test from out side tree.
+	* Add DCHECK_NOTNULL.
+	* Add ShutdownGoogleLogging to close syslog (thanks DGunchev)
+	* Fix --enable-frame-pointers option (thanks kazuki.ohta)
+	* Fix libunwind detection (thanks giantchen)
+
+2009-07-30  Google Inc. <opensource@google.com>
+
+	* google-glog: version 0.3.0
+	* Fix a deadlock happened when user uses glog with recent gflags.
+	* Suppress several unnecessary warnings (thanks keir).
+	* NetBSD and OpenBSD support.
+	* Use Win32API GetComputeNameA properly (thanks magila).
+	* Fix user name detection for Windows (thanks ademin).
+	* Fix several minor bugs.
+
+2009-04-10  Google Inc. <opensource@google.com>
+	* google-glog: version 0.2.1
+	* Fix timestamps of VC++ version.
+	* Add pkg-config support (thanks Tomasz)
+	* Fix build problem when building with gtest (thanks Michael)
+	* Add --with-gflags option for configure (thanks Michael)
+	* Fixes for GCC 4.4 (thanks John)
+
+2009-01-23  Google Inc. <opensource@google.com>
+	* google-glog: version 0.2
+	* Add initial Windows VC++ support.
+	* Google testing/mocking frameworks integration.
+	* Link pthread library automatically.
+	* Flush logs in signal handlers.
+	* Add macros LOG_TO_STRING, LOG_AT_LEVEL, DVLOG, and LOG_TO_SINK_ONLY.
+	* Log microseconds.
+	* Add --log_backtrace_at option.
+	* Fix some minor bugs.
+
+2008-11-18  Google Inc. <opensource@google.com>
+	* google-glog: version 0.1.2
+	* Add InstallFailureSignalHandler(). (satorux)
+	* Re-organize the way to produce stacktraces.
+	* Don't define unnecessary macro DISALLOW_EVIL_CONSTRUCTORS.
+
+2008-10-15  Google Inc. <opensource@google.com>
+	* google-glog: version 0.1.1
+	* Support symbolize for MacOSX 10.5.
+	* BUG FIX: --vmodule didn't work with gflags.
+	* BUG FIX: symbolize_unittest failed with GCC 4.3.
+	* Several fixes on the document.
+
+2008-10-07  Google Inc. <opensource@google.com>
+
+	* google-glog: initial release:
+	The glog package contains a library that implements application-level
+	logging.  This library provides logging APIs based on C++-style
+	streams and various helper macros.
diff --git a/share/doc/glog-0.3.4/INSTALL b/share/doc/glog-0.3.4/INSTALL
new file mode 100644
index 0000000..0babe24
--- /dev/null
+++ b/share/doc/glog-0.3.4/INSTALL
@@ -0,0 +1,297 @@
+Installation Instructions
+*************************
+
+Copyright (C) 1994, 1995, 1996, 1999, 2000, 2001, 2002, 2004, 2005,
+2006, 2007 Free Software Foundation, Inc.
+
+This file is free documentation; the Free Software Foundation gives
+unlimited permission to copy, distribute and modify it.
+
+Glog-Specific Install Notes
+================================
+
+*** NOTE FOR 64-BIT LINUX SYSTEMS
+
+The glibc built-in stack-unwinder on 64-bit systems has some problems
+with the glog libraries.  (In particular, if you are using
+InstallFailureSignalHandler(), the signal may be raised in the middle
+of malloc, holding some malloc-related locks when they invoke the
+stack unwinder.  The built-in stack unwinder may call malloc
+recursively, which may require the thread to acquire a lock it already
+holds: deadlock.)
+
+For that reason, if you use a 64-bit system and you need
+InstallFailureSignalHandler(), we strongly recommend you install
+libunwind before trying to configure or install google glog.
+libunwind can be found at
+
+   http://download.savannah.nongnu.org/releases/libunwind/libunwind-snap-070410.tar.gz
+
+Even if you already have libunwind installed, you will probably still
+need to install from the snapshot to get the latest version.
+
+CAUTION: if you install libunwind from the URL above, be aware that
+you may have trouble if you try to statically link your binary with
+glog: that is, if you link with 'gcc -static -lgcc_eh ...'.  This
+is because both libunwind and libgcc implement the same C++ exception
+handling APIs, but they implement them differently on some platforms.
+This is not likely to be a problem on ia64, but may be on x86-64.
+
+Also, if you link binaries statically, make sure that you add
+-Wl,--eh-frame-hdr to your linker options. This is required so that
+libunwind can find the information generated by the compiler required
+for stack unwinding.
+
+Using -static is rare, though, so unless you know this will affect you
+it probably won't.
+
+If you cannot or do not wish to install libunwind, you can still try
+to use two kinds of stack-unwinder: 1. glibc built-in stack-unwinder
+and 2. frame pointer based stack-unwinder.
+
+1. As we already mentioned, glibc's unwinder has a deadlock issue.
+However, if you don't use InstallFailureSignalHandler() or you don't
+worry about the rare possibilities of deadlocks, you can use this
+stack-unwinder.  If you specify no options and libunwind isn't
+detected on your system, the configure script chooses this unwinder by
+default.
+
+2. The frame pointer based stack unwinder requires that your
+application, the glog library, and system libraries like libc, all be
+compiled with a frame pointer.  This is *not* the default for x86-64.
+
+If you are on x86-64 system, know that you have a set of system
+libraries with frame-pointers enabled, and compile all your
+applications with -fno-omit-frame-pointer, then you can enable the
+frame pointer based stack unwinder by passing the
+--enable-frame-pointers flag to configure.
+
+
+Basic Installation
+==================
+
+Briefly, the shell commands `./configure; make; make install' should
+configure, build, and install this package.  The following
+more-detailed instructions are generic; see the `README' file for
+instructions specific to this package.
+
+   The `configure' shell script attempts to guess correct values for
+various system-dependent variables used during compilation.  It uses
+those values to create a `Makefile' in each directory of the package.
+It may also create one or more `.h' files containing system-dependent
+definitions.  Finally, it creates a shell script `config.status' that
+you can run in the future to recreate the current configuration, and a
+file `config.log' containing compiler output (useful mainly for
+debugging `configure').
+
+   It can also use an optional file (typically called `config.cache'
+and enabled with `--cache-file=config.cache' or simply `-C') that saves
+the results of its tests to speed up reconfiguring.  Caching is
+disabled by default to prevent problems with accidental use of stale
+cache files.
+
+   If you need to do unusual things to compile the package, please try
+to figure out how `configure' could check whether to do them, and mail
+diffs or instructions to the address given in the `README' so they can
+be considered for the next release.  If you are using the cache, and at
+some point `config.cache' contains results you don't want to keep, you
+may remove or edit it.
+
+   The file `configure.ac' (or `configure.in') is used to create
+`configure' by a program called `autoconf'.  You need `configure.ac' if
+you want to change it or regenerate `configure' using a newer version
+of `autoconf'.
+
+The simplest way to compile this package is:
+
+  1. `cd' to the directory containing the package's source code and type
+     `./configure' to configure the package for your system.
+
+     Running `configure' might take a while.  While running, it prints
+     some messages telling which features it is checking for.
+
+  2. Type `make' to compile the package.
+
+  3. Optionally, type `make check' to run any self-tests that come with
+     the package.
+
+  4. Type `make install' to install the programs and any data files and
+     documentation.
+
+  5. You can remove the program binaries and object files from the
+     source code directory by typing `make clean'.  To also remove the
+     files that `configure' created (so you can compile the package for
+     a different kind of computer), type `make distclean'.  There is
+     also a `make maintainer-clean' target, but that is intended mainly
+     for the package's developers.  If you use it, you may have to get
+     all sorts of other programs in order to regenerate files that came
+     with the distribution.
+
+  6. Often, you can also type `make uninstall' to remove the installed
+     files again.
+
+Compilers and Options
+=====================
+
+Some systems require unusual options for compilation or linking that the
+`configure' script does not know about.  Run `./configure --help' for
+details on some of the pertinent environment variables.
+
+   You can give `configure' initial values for configuration parameters
+by setting variables in the command line or in the environment.  Here
+is an example:
+
+     ./configure CC=c99 CFLAGS=-g LIBS=-lposix
+
+   *Note Defining Variables::, for more details.
+
+Compiling For Multiple Architectures
+====================================
+
+You can compile the package for more than one kind of computer at the
+same time, by placing the object files for each architecture in their
+own directory.  To do this, you can use GNU `make'.  `cd' to the
+directory where you want the object files and executables to go and run
+the `configure' script.  `configure' automatically checks for the
+source code in the directory that `configure' is in and in `..'.
+
+   With a non-GNU `make', it is safer to compile the package for one
+architecture at a time in the source code directory.  After you have
+installed the package for one architecture, use `make distclean' before
+reconfiguring for another architecture.
+
+Installation Names
+==================
+
+By default, `make install' installs the package's commands under
+`/usr/local/bin', include files under `/usr/local/include', etc.  You
+can specify an installation prefix other than `/usr/local' by giving
+`configure' the option `--prefix=PREFIX'.
+
+   You can specify separate installation prefixes for
+architecture-specific files and architecture-independent files.  If you
+pass the option `--exec-prefix=PREFIX' to `configure', the package uses
+PREFIX as the prefix for installing programs and libraries.
+Documentation and other data files still use the regular prefix.
+
+   In addition, if you use an unusual directory layout you can give
+options like `--bindir=DIR' to specify different values for particular
+kinds of files.  Run `configure --help' for a list of the directories
+you can set and what kinds of files go in them.
+
+   If the package supports it, you can cause programs to be installed
+with an extra prefix or suffix on their names by giving `configure' the
+option `--program-prefix=PREFIX' or `--program-suffix=SUFFIX'.
+
+Optional Features
+=================
+
+Some packages pay attention to `--enable-FEATURE' options to
+`configure', where FEATURE indicates an optional part of the package.
+They may also pay attention to `--with-PACKAGE' options, where PACKAGE
+is something like `gnu-as' or `x' (for the X Window System).  The
+`README' should mention any `--enable-' and `--with-' options that the
+package recognizes.
+
+   For packages that use the X Window System, `configure' can usually
+find the X include and library files automatically, but if it doesn't,
+you can use the `configure' options `--x-includes=DIR' and
+`--x-libraries=DIR' to specify their locations.
+
+Specifying the System Type
+==========================
+
+There may be some features `configure' cannot figure out automatically,
+but needs to determine by the type of machine the package will run on.
+Usually, assuming the package is built to be run on the _same_
+architectures, `configure' can figure that out, but if it prints a
+message saying it cannot guess the machine type, give it the
+`--build=TYPE' option.  TYPE can either be a short name for the system
+type, such as `sun4', or a canonical name which has the form:
+
+     CPU-COMPANY-SYSTEM
+
+where SYSTEM can have one of these forms:
+
+     OS KERNEL-OS
+
+   See the file `config.sub' for the possible values of each field.  If
+`config.sub' isn't included in this package, then this package doesn't
+need to know the machine type.
+
+   If you are _building_ compiler tools for cross-compiling, you should
+use the option `--target=TYPE' to select the type of system they will
+produce code for.
+
+   If you want to _use_ a cross compiler, that generates code for a
+platform different from the build platform, you should specify the
+"host" platform (i.e., that on which the generated programs will
+eventually be run) with `--host=TYPE'.
+
+Sharing Defaults
+================
+
+If you want to set default values for `configure' scripts to share, you
+can create a site shell script called `config.site' that gives default
+values for variables like `CC', `cache_file', and `prefix'.
+`configure' looks for `PREFIX/share/config.site' if it exists, then
+`PREFIX/etc/config.site' if it exists.  Or, you can set the
+`CONFIG_SITE' environment variable to the location of the site script.
+A warning: not all `configure' scripts look for a site script.
+
+Defining Variables
+==================
+
+Variables not defined in a site shell script can be set in the
+environment passed to `configure'.  However, some packages may run
+configure again during the build, and the customized values of these
+variables may be lost.  In order to avoid this problem, you should set
+them in the `configure' command line, using `VAR=value'.  For example:
+
+     ./configure CC=/usr/local2/bin/gcc
+
+causes the specified `gcc' to be used as the C compiler (unless it is
+overridden in the site shell script).
+
+Unfortunately, this technique does not work for `CONFIG_SHELL' due to
+an Autoconf bug.  Until the bug is fixed you can use this workaround:
+
+     CONFIG_SHELL=/bin/bash /bin/bash ./configure CONFIG_SHELL=/bin/bash
+
+`configure' Invocation
+======================
+
+`configure' recognizes the following options to control how it operates.
+
+`--help'
+`-h'
+     Print a summary of the options to `configure', and exit.
+
+`--version'
+`-V'
+     Print the version of Autoconf used to generate the `configure'
+     script, and exit.
+
+`--cache-file=FILE'
+     Enable the cache: use and save the results of the tests in FILE,
+     traditionally `config.cache'.  FILE defaults to `/dev/null' to
+     disable caching.
+
+`--config-cache'
+`-C'
+     Alias for `--cache-file=config.cache'.
+
+`--quiet'
+`--silent'
+`-q'
+     Do not print messages saying which checks are being made.  To
+     suppress all normal output, redirect it to `/dev/null' (any error
+     messages will still be shown).
+
+`--srcdir=DIR'
+     Look for the package's source code in directory DIR.  Usually
+     `configure' can determine that directory automatically.
+
+`configure' also accepts some other, not widely useful, options.  Run
+`configure --help' for more details.
+
diff --git a/share/doc/glog-0.3.4/NEWS b/share/doc/glog-0.3.4/NEWS
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/share/doc/glog-0.3.4/NEWS
diff --git a/share/doc/glog-0.3.4/README b/share/doc/glog-0.3.4/README
new file mode 100644
index 0000000..77efd37
--- /dev/null
+++ b/share/doc/glog-0.3.4/README
@@ -0,0 +1,5 @@
+This repository contains a C++ implementation of the Google logging
+module.  Documentation for the implementation is in doc/.
+
+See INSTALL for (generic) installation instructions for C++: basically
+   ./configure && make && make install
diff --git a/share/doc/glog-0.3.4/README.windows b/share/doc/glog-0.3.4/README.windows
new file mode 100644
index 0000000..dbeef32
--- /dev/null
+++ b/share/doc/glog-0.3.4/README.windows
@@ -0,0 +1,26 @@
+This project has begun being ported to Windows.  A working solution
+file exists in this directory:
+    google-glog.sln
+
+You can load this solution file into VC++ 9.0 (Visual Studio
+2008).  You may also be able to use this solution file with older
+Visual Studios by converting the solution file.
+
+Note that stack tracing and some unittests are not ported
+yet.
+
+You can also link glog code in statically -- see the example project
+libglog_static and logging_unittest_static, which does this.  For this
+to work, you'll need to add "/D GOOGLE_GLOG_DLL_DECL=" to the compile
+line of every glog's .cc file.
+
+I have little experience with Windows programming, so there may be
+better ways to set this up than I've done!  If you run across any
+problems, please post to the google-glog Google Group, or report
+them on the google-glog Google Code site:
+   http://groups.google.com/group/google-glog
+   https://github.com/google/glog/issues
+
+-- Shinichiro Hamaji
+
+Last modified: 23 January 2009
diff --git a/share/doc/glog-0.3.4/designstyle.css b/share/doc/glog-0.3.4/designstyle.css
new file mode 100644
index 0000000..f5d1ec2
--- /dev/null
+++ b/share/doc/glog-0.3.4/designstyle.css
@@ -0,0 +1,115 @@
+body {
+  background-color: #ffffff;
+  color: black;
+  margin-right: 1in;
+  margin-left: 1in;
+}
+
+
+h1, h2, h3, h4, h5, h6 {
+  color: #3366ff;
+  font-family: sans-serif;
+}
+@media print {
+  /* Darker version for printing */
+  h1, h2, h3, h4, h5, h6 {
+    color: #000080;
+    font-family: helvetica, sans-serif;
+  }
+}
+
+h1 { 
+  text-align: center;
+  font-size: 18pt;
+}
+h2 {
+  margin-left: -0.5in;
+}
+h3 {
+  margin-left: -0.25in;
+}
+h4 {
+  margin-left: -0.125in;
+}
+hr {
+  margin-left: -1in;
+}
+
+/* Definition lists: definition term bold */
+dt {
+  font-weight: bold;
+}
+
+address {
+  text-align: right;
+}
+/* Use the <code> tag for bits of code and <var> for variables and objects. */
+code,pre,samp,var {
+  color: #006000;
+}
+/* Use the <file> tag for file and directory paths and names. */
+file {
+  color: #905050;
+  font-family: monospace;
+}
+/* Use the <kbd> tag for stuff the user should type. */
+kbd {
+  color: #600000;
+}
+div.note p {
+  float: right;
+  width: 3in;
+  margin-right: 0%;
+  padding: 1px;
+  border: 2px solid #6060a0;
+  background-color: #fffff0;
+}
+
+UL.nobullets {
+  list-style-type: none;
+  list-style-image: none;
+  margin-left: -1em;
+}
+
+/*
+body:after {
+  content: "Google Confidential";
+}
+*/
+
+/* pretty printing styles.  See prettify.js */
+.str { color: #080; }
+.kwd { color: #008; }
+.com { color: #800; }
+.typ { color: #606; }
+.lit { color: #066; }
+.pun { color: #660; }
+.pln { color: #000; }
+.tag { color: #008; }
+.atn { color: #606; }
+.atv { color: #080; }
+pre.prettyprint { padding: 2px; border: 1px solid #888; }
+
+.embsrc { background: #eee; }
+
+@media print {
+  .str { color: #060; }
+  .kwd { color: #006; font-weight: bold; }
+  .com { color: #600; font-style: italic; }
+  .typ { color: #404; font-weight: bold; }
+  .lit { color: #044; }
+  .pun { color: #440; }
+  .pln { color: #000; }
+  .tag { color: #006; font-weight: bold; }
+  .atn { color: #404; }
+  .atv { color: #060; }
+}
+
+/* Table Column Headers */
+.hdr { 
+  color: #006; 
+  font-weight: bold; 
+  background-color: #dddddd; }
+.hdr2 { 
+  color: #006; 
+  background-color: #eeeeee; }
\ No newline at end of file
diff --git a/share/doc/glog-0.3.4/glog.html b/share/doc/glog-0.3.4/glog.html
new file mode 100644
index 0000000..8b200ba
--- /dev/null
+++ b/share/doc/glog-0.3.4/glog.html
@@ -0,0 +1,613 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+
+<html>
+<head>
+<title>How To Use Google Logging Library (glog)</title>
+
+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<link href="http://www.google.com/favicon.ico" type="image/x-icon"
+      rel="shortcut icon">
+<link href="designstyle.css" type="text/css" rel="stylesheet">
+<style type="text/css">
+<!--
+  ol.bluelist li {
+    color: #3366ff;
+    font-family: sans-serif;
+  }
+  ol.bluelist li p {
+    color: #000;
+    font-family: "Times Roman", times, serif;
+  }
+  ul.blacklist li {
+    color: #000;
+    font-family: "Times Roman", times, serif;
+  }
+//-->
+</style>
+</head>
+
+<body>
+
+<h1>How To Use Google Logging Library (glog)</h1>
+<small>(as of
+<script type=text/javascript>
+  var lm = new Date(document.lastModified);
+  document.write(lm.toDateString());
+</script>)
+</small>
+<br>
+
+<h2> <A NAME=intro>Introduction</A> </h2>
+
+<p><b>Google glog</b> is a library that implements application-level
+logging.  This library provides logging APIs based on C++-style
+streams and various helper macros.
+You can log a message by simply streaming things to LOG(&lt;a
+particular <a href="#severity">severity level</a>&gt;), e.g.
+
+<pre>
+   #include &lt;glog/logging.h&gt;
+
+   int main(int argc, char* argv[]) {
+     // Initialize Google's logging library.
+     google::InitGoogleLogging(argv[0]);
+
+     // ...
+     LOG(INFO) &lt;&lt; "Found " &lt;&lt; num_cookies &lt;&lt; " cookies";
+   }
+</pre>
+
+<p>Google glog defines a series of macros that simplify many common logging
+tasks.  You can log messages by severity level, control logging
+behavior from the command line, log based on conditionals, abort the
+program when expected conditions are not met, introduce your own
+verbose logging levels, and more.  This document describes the
+functionality supported by glog.  Please note that this document
+doesn't describe all features in this library, but the most useful
+ones.  If you want to find less common features, please check
+header files under <code>src/glog</code> directory.
+
+<h2> <A NAME=severity>Severity Level</A> </h2>
+
+<p>
+You can specify one of the following severity levels (in
+increasing order of severity): <code>INFO</code>, <code>WARNING</code>,
+<code>ERROR</code>, and <code>FATAL</code>.
+Logging a <code>FATAL</code> message terminates the program (after the
+message is logged).
+Note that messages of a given severity are logged not only in the
+logfile for that severity, but also in all logfiles of lower severity.
+E.g., a message of severity <code>FATAL</code> will be logged to the
+logfiles of severity <code>FATAL</code>, <code>ERROR</code>,
+<code>WARNING</code>, and <code>INFO</code>.
+
+<p>
+The <code>DFATAL</code> severity logs a <code>FATAL</code> error in
+debug mode (i.e., there is no <code>NDEBUG</code> macro defined), but
+avoids halting the program in production by automatically reducing the
+severity to <code>ERROR</code>.
+
+<p>Unless otherwise specified, glog writes to the filename
+"/tmp/&lt;program name&gt;.&lt;hostname&gt;.&lt;user name&gt;.log.&lt;severity level&gt;.&lt;date&gt;.&lt;time&gt;.&lt;pid&gt;"
+(e.g., "/tmp/hello_world.example.com.hamaji.log.INFO.20080709-222411.10474").
+By default, glog copies the log messages of severity level
+<code>ERROR</code> or <code>FATAL</code> to standard error (stderr)
+in addition to log files.
+
+<h2><A NAME=flags>Setting Flags</A></h2>
+
+<p>Several flags influence glog's output behavior.
+If the <a href="http://code.google.com/p/google-gflags/">Google
+gflags library</a> is installed on your machine, the
+<code>configure</code> script (see the INSTALL file in the package for
+detail of this script) will automatically detect and use it,
+allowing you to pass flags on the command line.  For example, if you
+want to turn the flag <code>--logtostderr</code> on, you can start
+your application with the following command line:
+
+<pre>
+   ./your_application --logtostderr=1
+</pre>
+
+If the Google gflags library isn't installed, you set flags via
+environment variables, prefixing the flag name with "GLOG_", e.g.
+
+<pre>
+   GLOG_logtostderr=1 ./your_application
+</pre>
+
+<!-- TODO(hamaji): Fill the version number
+<p>By glog version 0.x.x, you can use GLOG_* environment variables
+even if you have gflags. If both an environment variable and a flag
+are specified, the value specified by a flag wins. E.g., if GLOG_v=0
+and --v=1, the verbosity will be 1, not 0.
+-->
+
+<p>The following flags are most commonly used:
+
+<dl>
+<dt><code>logtostderr</code> (<code>bool</code>, default=<code>false</code>)
+<dd>Log messages to stderr instead of logfiles.<br>
+Note: you can set binary flags to <code>true</code> by specifying
+<code>1</code>, <code>true</code>, or <code>yes</code> (case
+insensitive).
+Also, you can set binary flags to <code>false</code> by specifying
+<code>0</code>, <code>false</code>, or <code>no</code> (again, case
+insensitive).
+<dt><code>stderrthreshold</code> (<code>int</code>, default=2, which
+is <code>ERROR</code>)
+<dd>Copy log messages at or above this level to stderr in
+addition to logfiles.  The numbers of severity levels
+<code>INFO</code>, <code>WARNING</code>, <code>ERROR</code>, and
+<code>FATAL</code> are 0, 1, 2, and 3, respectively.
+<dt><code>minloglevel</code> (<code>int</code>, default=0, which
+is <code>INFO</code>)
+<dd>Log messages at or above this level.  Again, the numbers of
+severity levels <code>INFO</code>, <code>WARNING</code>,
+<code>ERROR</code>, and <code>FATAL</code> are 0, 1, 2, and 3,
+respectively.
+<dt><code>log_dir</code> (<code>string</code>, default="")
+<dd>If specified, logfiles are written into this directory instead
+of the default logging directory.
+<dt><code>v</code> (<code>int</code>, default=0)
+<dd>Show all <code>VLOG(m)</code> messages for <code>m</code> less or
+equal the value of this flag.  Overridable by --vmodule.
+See <a href="#verbose">the section about verbose logging</a> for more
+detail.
+<dt><code>vmodule</code> (<code>string</code>, default="")
+<dd>Per-module verbose level.  The argument has to contain a
+comma-separated list of &lt;module name&gt;=&lt;log level&gt;.
+&lt;module name&gt;
+is a glob pattern (e.g., <code>gfs*</code> for all modules whose name
+starts with "gfs"), matched against the filename base
+(that is, name ignoring .cc/.h./-inl.h).
+&lt;log level&gt; overrides any value given by --v.
+See also <a href="#verbose">the section about verbose logging</a>.
+</dl>
+
+<p>There are some other flags defined in logging.cc.  Please grep the
+source code for "DEFINE_" to see a complete list of all flags.
+
+<p>You can also modify flag values in your program by modifying global
+variables <code>FLAGS_*</code> . Most settings start working
+immediately after you update <code>FLAGS_*</code> . The exceptions are
+the flags related to destination files. For example, you might want to
+set <code>FLAGS_log_dir</code> before
+calling <code>google::InitGoogleLogging</code> . Here is an example:
+
+<pre>
+   LOG(INFO) << "file";
+   // Most flags work immediately after updating values.
+   FLAGS_logtostderr = 1;
+   LOG(INFO) << "stderr";
+   FLAGS_logtostderr = 0;
+   // This won't change the log destination. If you want to set this
+   // value, you should do this before google::InitGoogleLogging .
+   FLAGS_log_dir = "/some/log/directory";
+   LOG(INFO) << "the same file";
+</pre>
+
+<h2><A NAME=conditional>Conditional / Occasional Logging</A></h2>
+
+<p>Sometimes, you may only want to log a message under certain
+conditions. You can use the following macros to perform conditional
+logging:
+
+<pre>
+   LOG_IF(INFO, num_cookies &gt; 10) &lt;&lt; "Got lots of cookies";
+</pre>
+
+The "Got lots of cookies" message is logged only when the variable
+<code>num_cookies</code> exceeds 10.
+
+If a line of code is executed many times, it may be useful to only log
+a message at certain intervals.  This kind of logging is most useful
+for informational messages.
+
+<pre>
+   LOG_EVERY_N(INFO, 10) &lt;&lt; "Got the " &lt;&lt; google::COUNTER &lt;&lt; "th cookie";
+</pre>
+
+<p>The above line outputs a log messages on the 1st, 11th,
+21st, ... times it is executed.  Note that the special
+<code>google::COUNTER</code> value is used to identify which repetition is
+happening.
+
+<p>You can combine conditional and occasional logging with the
+following macro.
+
+<pre>
+   LOG_IF_EVERY_N(INFO, (size &gt; 1024), 10) &lt;&lt; "Got the " &lt;&lt; google::COUNTER
+                                           &lt;&lt; "th big cookie";
+</pre>
+
+<p>Instead of outputting a message every nth time, you can also limit
+the output to the first n occurrences:
+
+<pre>
+   LOG_FIRST_N(INFO, 20) &lt;&lt; "Got the " &lt;&lt; google::COUNTER &lt;&lt; "th cookie";
+</pre>
+
+<p>Outputs log messages for the first 20 times it is executed.  Again,
+the <code>google::COUNTER</code> identifier indicates which repetition is
+happening.
+
+<h2><A NAME=debug>Debug Mode Support</A></h2>
+
+<p>Special "debug mode" logging macros only have an effect in debug
+mode and are compiled away to nothing for non-debug mode
+compiles.  Use these macros to avoid slowing down your production
+application due to excessive logging.
+
+<pre>
+   DLOG(INFO) &lt;&lt; "Found cookies";
+
+   DLOG_IF(INFO, num_cookies &gt; 10) &lt;&lt; "Got lots of cookies";
+
+   DLOG_EVERY_N(INFO, 10) &lt;&lt; "Got the " &lt;&lt; google::COUNTER &lt;&lt; "th cookie";
+</pre>
+
+<h2><A NAME=check>CHECK Macros</A></h2>
+
+<p>It is a good practice to check expected conditions in your program
+frequently to detect errors as early as possible. The
+<code>CHECK</code> macro provides the ability to abort the application
+when a condition is not met, similar to the <code>assert</code> macro
+defined in the standard C library.
+
+<p><code>CHECK</code> aborts the application if a condition is not
+true.  Unlike <code>assert</code>, it is *not* controlled by
+<code>NDEBUG</code>, so the check will be executed regardless of
+compilation mode.  Therefore, <code>fp-&gt;Write(x)</code> in the
+following example is always executed:
+
+<pre>
+   CHECK(fp-&gt;Write(x) == 4) &lt;&lt; "Write failed!";
+</pre>
+
+<p>There are various helper macros for
+equality/inequality checks - <code>CHECK_EQ</code>,
+<code>CHECK_NE</code>, <code>CHECK_LE</code>, <code>CHECK_LT</code>,
+<code>CHECK_GE</code>, and <code>CHECK_GT</code>.
+They compare two values, and log a
+<code>FATAL</code> message including the two values when the result is
+not as expected.  The values must have <code>operator&lt;&lt;(ostream,
+...)</code> defined.
+
+<p>You may append to the error message like so:
+
+<pre>
+   CHECK_NE(1, 2) &lt;&lt; ": The world must be ending!";
+</pre>
+
+<p>We are very careful to ensure that each argument is evaluated exactly
+once, and that anything which is legal to pass as a function argument is
+legal here.  In particular, the arguments may be temporary expressions
+which will end up being destroyed at the end of the apparent statement,
+for example:
+
+<pre>
+   CHECK_EQ(string("abc")[1], 'b');
+</pre>
+
+<p>The compiler reports an error if one of the arguments is a
+pointer and the other is NULL. To work around this, simply static_cast
+NULL to the type of the desired pointer.
+
+<pre>
+   CHECK_EQ(some_ptr, static_cast&lt;SomeType*&gt;(NULL));
+</pre>
+
+<p>Better yet, use the CHECK_NOTNULL macro:
+
+<pre>
+   CHECK_NOTNULL(some_ptr);
+   some_ptr-&gt;DoSomething();
+</pre>
+
+<p>Since this macro returns the given pointer, this is very useful in
+constructor initializer lists.
+
+<pre>
+   struct S {
+     S(Something* ptr) : ptr_(CHECK_NOTNULL(ptr)) {}
+     Something* ptr_;
+   };
+</pre>
+
+<p>Note that you cannot use this macro as a C++ stream due to this
+feature.  Please use <code>CHECK_EQ</code> described above to log a
+custom message before aborting the application.
+
+<p>If you are comparing C strings (char *), a handy set of macros
+performs case sensitive as well as case insensitive comparisons -
+<code>CHECK_STREQ</code>, <code>CHECK_STRNE</code>,
+<code>CHECK_STRCASEEQ</code>, and <code>CHECK_STRCASENE</code>.  The
+CASE versions are case-insensitive.  You can safely pass <code>NULL</code>
+pointers for this macro.  They treat <code>NULL</code> and any
+non-<code>NULL</code> string as not equal.  Two <code>NULL</code>s are
+equal.
+
+<p>Note that both arguments may be temporary strings which are
+destructed at the end of the current "full expression"
+(e.g., <code>CHECK_STREQ(Foo().c_str(), Bar().c_str())</code> where
+<code>Foo</code> and <code>Bar</code> return C++'s
+<code>std::string</code>).
+
+<p>The <code>CHECK_DOUBLE_EQ</code> macro checks the equality of two
+floating point values, accepting a small error margin.
+<code>CHECK_NEAR</code> accepts a third floating point argument, which
+specifies the acceptable error margin.
+
+<h2><A NAME=verbose>Verbose Logging</A></h2>
+
+<p>When you are chasing difficult bugs, thorough log messages are very
+useful.  However, you may want to ignore too verbose messages in usual
+development.  For such verbose logging, glog provides the
+<code>VLOG</code> macro, which allows you to define your own numeric
+logging levels.  The <code>--v</code> command line option controls
+which verbose messages are logged:
+
+<pre>
+   VLOG(1) &lt;&lt; "I'm printed when you run the program with --v=1 or higher";
+   VLOG(2) &lt;&lt; "I'm printed when you run the program with --v=2 or higher";
+</pre>
+
+<p>With <code>VLOG</code>, the lower the verbose level, the more
+likely messages are to be logged.  For example, if
+<code>--v==1</code>, <code>VLOG(1)</code> will log, but
+<code>VLOG(2)</code> will not log.  This is opposite of the severity
+level, where <code>INFO</code> is 0, and <code>ERROR</code> is 2.
+<code>--minloglevel</code> of 1 will log <code>WARNING</code> and
+above.  Though you can specify any integers for both <code>VLOG</code>
+macro and <code>--v</code> flag, the common values for them are small
+positive integers.  For example, if you write <code>VLOG(0)</code>,
+you should specify <code>--v=-1</code> or lower to silence it.  This
+is less useful since we may not want verbose logs by default in most
+cases.  The <code>VLOG</code> macros always log at the
+<code>INFO</code> log level (when they log at all).
+
+<p>Verbose logging can be controlled from the command line on a
+per-module basis:
+
+<pre>
+   --vmodule=mapreduce=2,file=1,gfs*=3 --v=0
+</pre>
+
+<p>will:
+
+<ul>
+  <li>a. Print VLOG(2) and lower messages from mapreduce.{h,cc}
+  <li>b. Print VLOG(1) and lower messages from file.{h,cc}
+  <li>c. Print VLOG(3) and lower messages from files prefixed with "gfs"
+  <li>d. Print VLOG(0) and lower messages from elsewhere
+</ul>
+
+<p>The wildcarding functionality shown by (c) supports both '*'
+(matches 0 or more characters) and '?' (matches any single character)
+wildcards.  Please also check the section about <a
+href="#flags">command line flags</a>.
+
+<p>There's also <code>VLOG_IS_ON(n)</code> "verbose level" condition
+macro.  This macro returns true when the <code>--v</code> is equal or
+greater than <code>n</code>.  To be used as
+
+<pre>
+   if (VLOG_IS_ON(2)) {
+     // do some logging preparation and logging
+     // that can't be accomplished with just VLOG(2) &lt;&lt; ...;
+   }
+</pre>
+
+<p>Verbose level condition macros <code>VLOG_IF</code>,
+<code>VLOG_EVERY_N</code> and <code>VLOG_IF_EVERY_N</code> behave
+analogous to <code>LOG_IF</code>, <code>LOG_EVERY_N</code>,
+<code>LOF_IF_EVERY</code>, but accept a numeric verbosity level as
+opposed to a severity level.
+
+<pre>
+   VLOG_IF(1, (size &gt; 1024))
+      &lt;&lt; "I'm printed when size is more than 1024 and when you run the "
+         "program with --v=1 or more";
+   VLOG_EVERY_N(1, 10)
+      &lt;&lt; "I'm printed every 10th occurrence, and when you run the program "
+         "with --v=1 or more. Present occurence is " &lt;&lt; google::COUNTER;
+   VLOG_IF_EVERY_N(1, (size &gt; 1024), 10)
+      &lt;&lt; "I'm printed on every 10th occurence of case when size is more "
+         " than 1024, when you run the program with --v=1 or more. ";
+         "Present occurence is " &lt;&lt; google::COUNTER;
+</pre>
+
+<h2> <A name="signal">Failure Signal Handler</A> </h2>
+
+<p>
+The library provides a convenient signal handler that will dump useful
+information when the program crashes on certain signals such as SIGSEGV.
+The signal handler can be installed by
+google::InstallFailureSignalHandler().  The following is an example of output
+from the signal handler.
+
+<pre>
+*** Aborted at 1225095260 (unix time) try "date -d @1225095260" if you are using GNU date ***
+*** SIGSEGV (@0x0) received by PID 17711 (TID 0x7f893090a6f0) from PID 0; stack trace: ***
+PC: @           0x412eb1 TestWaitingLogSink::send()
+    @     0x7f892fb417d0 (unknown)
+    @           0x412eb1 TestWaitingLogSink::send()
+    @     0x7f89304f7f06 google::LogMessage::SendToLog()
+    @     0x7f89304f35af google::LogMessage::Flush()
+    @     0x7f89304f3739 google::LogMessage::~LogMessage()
+    @           0x408cf4 TestLogSinkWaitTillSent()
+    @           0x4115de main
+    @     0x7f892f7ef1c4 (unknown)
+    @           0x4046f9 (unknown)
+</pre>
+
+<p>
+By default, the signal handler writes the failure dump to the standard
+error.  You can customize the destination by InstallFailureWriter().
+
+<h2> <A name="misc">Miscellaneous Notes</A> </h2>
+
+<h3><A NAME=message>Performance of Messages</A></h3>
+
+<p>The conditional logging macros provided by glog (e.g.,
+<code>CHECK</code>, <code>LOG_IF</code>, <code>VLOG</code>, ...) are
+carefully implemented and don't execute the right hand side
+expressions when the conditions are false.  So, the following check
+may not sacrifice the performance of your application.
+
+<pre>
+   CHECK(obj.ok) &lt;&lt; obj.CreatePrettyFormattedStringButVerySlow();
+</pre>
+
+<h3><A NAME=failure>User-defined Failure Function</A></h3>
+
+<p><code>FATAL</code> severity level messages or unsatisfied
+<code>CHECK</code> condition terminate your program.  You can change
+the behavior of the termination by
+<code>InstallFailureFunction</code>.
+
+<pre>
+   void YourFailureFunction() {
+     // Reports something...
+     exit(1);
+   }
+
+   int main(int argc, char* argv[]) {
+     google::InstallFailureFunction(&amp;YourFailureFunction);
+   }
+</pre>
+
+<p>By default, glog tries to dump stacktrace and makes the program
+exit with status 1.  The stacktrace is produced only when you run the
+program on an architecture for which glog supports stack tracing (as
+of September 2008, glog supports stack tracing for x86 and x86_64).
+
+<h3><A NAME=raw>Raw Logging</A></h3>
+
+<p>The header file <code>&lt;glog/raw_logging.h&gt;</code> can be
+used for thread-safe logging, which does not allocate any memory or
+acquire any locks.  Therefore, the macros defined in this
+header file can be used by low-level memory allocation and
+synchronization code.
+Please check <code>src/glog/raw_logging.h.in</code> for detail.
+</p>
+
+<h3><A NAME=plog>Google Style perror()</A></h3>
+
+<p><code>PLOG()</code> and <code>PLOG_IF()</code> and
+<code>PCHECK()</code> behave exactly like their <code>LOG*</code> and
+<code>CHECK</code> equivalents with the addition that they append a
+description of the current state of errno to their output lines.
+E.g.
+
+<pre>
+   PCHECK(write(1, NULL, 2) &gt;= 0) &lt;&lt; "Write NULL failed";
+</pre>
+
+<p>This check fails with the following error message.
+
+<pre>
+   F0825 185142 test.cc:22] Check failed: write(1, NULL, 2) &gt;= 0 Write NULL failed: Bad address [14]
+</pre>
+
+<h3><A NAME=syslog>Syslog</A></h3>
+
+<p><code>SYSLOG</code>, <code>SYSLOG_IF</code>, and
+<code>SYSLOG_EVERY_N</code> macros are available.
+These log to syslog in addition to the normal logs.  Be aware that
+logging to syslog can drastically impact performance, especially if
+syslog is configured for remote logging!  Make sure you understand the
+implications of outputting to syslog before you use these macros. In
+general, it's wise to use these macros sparingly.
+
+<h3><A NAME=strip>Strip Logging Messages</A></h3>
+
+<p>Strings used in log messages can increase the size of your binary
+and present a privacy concern.  You can therefore instruct glog to
+remove all strings which fall below a certain severity level by using
+the GOOGLE_STRIP_LOG macro:
+
+<p>If your application has code like this:
+
+<pre>
+   #define GOOGLE_STRIP_LOG 1    // this must go before the #include!
+   #include &lt;glog/logging.h&gt;
+</pre>
+
+<p>The compiler will remove the log messages whose severities are less
+than the specified integer value.  Since
+<code>VLOG</code> logs at the severity level <code>INFO</code>
+(numeric value <code>0</code>),
+setting <code>GOOGLE_STRIP_LOG</code> to 1 or greater removes
+all log messages associated with <code>VLOG</code>s as well as
+<code>INFO</code> log statements.
+
+<h3><A NAME=windows>Notes for Windows users</A></h3>
+
+<p>Google glog defines a severity level <code>ERROR</code>, which is
+also defined in <code>windows.h</code> . You can make glog not define
+<code>INFO</code>, <code>WARNING</code>, <code>ERROR</code>,
+and <code>FATAL</code> by defining
+<code>GLOG_NO_ABBREVIATED_SEVERITIES</code> before
+including <code>glog/logging.h</code> . Even with this macro, you can
+still use the iostream like logging facilities:
+
+<pre>
+  #define GLOG_NO_ABBREVIATED_SEVERITIES
+  #include &lt;windows.h&gt;
+  #include &lt;glog/logging.h&gt;
+
+  // ...
+
+  LOG(ERROR) &lt;&lt; "This should work";
+  LOG_IF(ERROR, x &gt; y) &lt;&lt; "This should be also OK";
+</pre>
+
+<p>
+However, you cannot
+use <code>INFO</code>, <code>WARNING</code>, <code>ERROR</code>,
+and <code>FATAL</code> anymore for functions defined
+in <code>glog/logging.h</code> .
+
+<pre>
+  #define GLOG_NO_ABBREVIATED_SEVERITIES
+  #include &lt;windows.h&gt;
+  #include &lt;glog/logging.h&gt;
+
+  // ...
+
+  // This won't work.
+  // google::FlushLogFiles(google::ERROR);
+
+  // Use this instead.
+  google::FlushLogFiles(google::GLOG_ERROR);
+</pre>
+
+<p>
+If you don't need <code>ERROR</code> defined
+by <code>windows.h</code>, there are a couple of more workarounds
+which sometimes don't work:
+
+<ul>
+  <li>#define <code>WIN32_LEAN_AND_MEAN</code> or <code>NOGDI</code>
+      <strong>before</strong> you #include <code>windows.h</code> .
+  <li>#undef <code>ERROR</code> <strong>after</strong> you #include
+      <code>windows.h</code> .
+</ul>
+
+<p>See <a href="http://code.google.com/p/google-glog/issues/detail?id=33">
+this issue</a> for more detail.
+
+<hr>
+<address>
+Shinichiro Hamaji<br>
+Gregor Hohpe<br>
+<script type=text/javascript>
+  var lm = new Date(document.lastModified);
+  document.write(lm.toDateString());
+</script>
+</address>
+
+</body>
+</html>