configure.ac - toolchain/m4 - Git at Google

 # Configure template for GNU M4.           -*-Autoconf-*-
 # Copyright (C) 1991, 1993-1994, 2004-2014, 2016 Free Software
 # Foundation, Inc.
 #
 # This file is part of GNU M4.
 #
 # GNU M4 is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # GNU M4 is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 AC_PREREQ([2.62])
 AC_INIT([GNU M4], m4_esyscmd([build-aux/git-version-gen .tarball-version]),
   [bug-m4@gnu.org])
 AC_CONFIG_AUX_DIR([build-aux])

 AM_INIT_AUTOMAKE([1.11.6 dist-bzip2 dist-xz color-tests parallel-tests
 silent-rules subdir-objects gnu])
 AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.

 m4_pattern_forbid([^M4_[A-Z]])

 AC_CONFIG_SRCDIR([src/m4.h])
 AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])

 AC_PROG_CC
 AC_DEFUN([gl_CXX_CHOICE_DEFAULT_NO])
 M4_EARLY

 # Maintainer note - comment this line out if you plan to rerun
 # GNULIB_POSIXCHECK testing to see if M4 should be using more modules.
 # Leave it uncommented for normal releases, for faster ./configure.
 gl_ASSERT_NO_GNULIB_POSIXCHECK

 # M4 is single-threaded; so we can optimize gnulib code by using this:
 gl_DISABLE_THREADS

 AC_ARG_ENABLE([gcc-warnings],
   [AS_HELP_STRING([--enable-gcc-warnings],
                   [turn on lots of GCC warnings (for developers)])],
   [case $enableval in
      yes|no) ;;
      *)      AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
    esac
    gl_gcc_warnings=$enableval],
   [if test -f "$srcdir"/.tarball-version; then
      gl_gcc_warnings=no
    else
      gl_gcc_warnings=yes
    fi]
 )

 if test "$gl_gcc_warnings" = yes; then
   gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
   AC_SUBST([WERROR_CFLAGS])

   # We use '#pragma GCC diagnostic push' to silence some
   # warnings, but older gcc doesn't support this.
   AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
     [M4_cv_gcc_pragma_push_works], [
     save_CFLAGS=$CFLAGS
     CFLAGS='-Wunknown-pragmas -Werror'
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #pragma GCC diagnostic push
       #pragma GCC diagnostic pop
     ]])],
     [M4_cv_gcc_pragma_push_works=yes],
     [M4_cv_gcc_pragma_push_works=no])
     CFLAGS=$save_CFLAGS])

   # This, $nw, is the list of warnings we disable.
   nw=
   nw="$nw -Waggregate-return"       # K&R is anachronistic
   nw="$nw -Wtraditional-conversion" # K&R is anachronistic
   nw="$nw -Wundef"                  # K&R is anachronistic
   nw="$nw -Wtraditional"            # K&R is anachronistic
   nw="$nw -Wlong-long"              # C90 is anachronistic
   nw="$nw -Wsystem-headers"         # Don't let system headers trigger warnings
   nw="$nw -Wpadded"                 # Our structs are not packed
   nw="$nw -Wconversion"             # Too many warnings for now
   nw="$nw -Wsign-conversion"        # Too many warnings for now
   nw="$nw -Wcast-qual"              # Too many warnings for now
   nw="$nw -Wswitch-enum"            # Too many warnings for now
   # gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
   nw="$nw -Wenum-compare"

   # Gnulib uses '#pragma GCC diagnostic push' to silence some
   # warnings, but older gcc doesn't support this.
   AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
     [M4_cv_gcc_pragma_push_works], [
     save_CFLAGS=$CFLAGS
     CFLAGS='-Wunknown-pragmas -Werror'
     AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
       #pragma GCC diagnostic push
       #pragma GCC diagnostic pop
     ]])],
     [M4_cv_gcc_pragma_push_works=yes],
     [M4_cv_gcc_pragma_push_works=no])
     CFLAGS=$save_CFLAGS])
   if test $M4_cv_gcc_pragma_push_works = no; then
     nw="$nw -Wmissing-prototypes"
     nw="$nw -Wmissing-declarations"
     nw="$nw -Wunreachable-code"
   fi

   gl_MANYWARN_ALL_GCC([ws])
   gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
   for w in $ws; do
     gl_WARN_ADD([$w])
   done

   # Gnulib turns on -Wformat=2, which implies -Wformat-nonliteral, but
   # we temporarily override it in format.c if possible.
   if test $M4_cv_gcc_pragma_push_works = no; then
     gl_WARN_ADD([-Wno-format-nonliteral])
   fi

   AC_SUBST([WARN_CFLAGS])

   AH_VERBATIM([FORTIFY_SOURCE],
   [/* Enable compile-time and run-time bounds-checking, and some warnings,
       without upsetting newer glibc. */
    #if defined __OPTIMIZE__ && __OPTIMIZE__
    # define _FORTIFY_SOURCE 2
    #endif
   ])
 fi

 # Tandem/NSK is broken - it has 'long long int' but not
 # 'unsigned long long int', which confuses assumptions made by gnulib.
 # Simply pretend that neither type exists if both do not work.
 AC_TYPE_LONG_LONG_INT
 AC_TYPE_UNSIGNED_LONG_LONG_INT
 if test $ac_cv_type_long_long_int:$ac_cv_type_unsigned_long_long_int = yes:no
 then
   ac_cv_type_long_long_int=no
   AC_DEFINE([HAVE_LONG_LONG_INT], 0,
     [Define to 1 if the system has the type `long long int'.])
 fi

 M4_INIT

 AC_CACHE_CHECK([whether an open file can be renamed],
   [M4_cv_func_rename_open_file_works],
   [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
       [FILE *f = fopen ("conftest.1", "w+");
        int result = rename ("conftest.1", "conftest.2");
        fclose (f); remove ("conftest.1"); remove ("conftest.2");
        return result;])],
     [M4_cv_func_rename_open_file_works=yes],
     [M4_cv_func_rename_open_file_works=no],
     [M4_cv_func_rename_open_file_works='guessing no'])])
 if test "$M4_cv_func_rename_open_file_works" = yes ; then
   M4_rename_open_works=1
 else
   M4_rename_open_works=0
 fi
 AC_DEFINE_UNQUOTED([RENAME_OPEN_FILE_WORKS], [$M4_rename_open_works],
   [Define to 1 if a file can be renamed while open, or to 0 if not.])

 dnl Don't let changeword get in our way, if bootstrapping with a version of
 dnl m4 that already turned the feature on.
 m4_ifdef([changeword], [m4_undefine([changeword])])dnl

 AC_MSG_CHECKING([[if changeword is wanted]])
 AC_ARG_ENABLE([changeword],
   [AS_HELP_STRING([--enable-changeword],
      [enable -W and changeword() builtin])],
   [if test "$enableval" = yes; then
     AC_MSG_RESULT([yes])
     AC_DEFINE([ENABLE_CHANGEWORD], [1],
       [Define to 1 if the changeword(REGEXP) functionality is wanted])
   else
     AC_MSG_RESULT([no])
   fi], [AC_MSG_RESULT([no])])

 AC_MSG_CHECKING([[which shell to use for syscmd]])
 AC_ARG_WITH([syscmd-shell],
   [AS_HELP_STRING([--with-syscmd-shell], [shell used by syscmd [/bin/sh]])],
   [case $withval in
     yes[)] with_syscmd_shell=no;;
    esac], [with_syscmd_shell=no])
 if test "$with_syscmd_shell" = no ; then
   with_syscmd_shell=/bin/sh
   if test "$cross_compiling" != yes ; then
 dnl Give mingw a default that is more likely to be available.
     AS_IF([AS_EXECUTABLE_P([/bin/sh$EXEEXT])], [],
       [if (cmd /c) 2>/dev/null; then with_syscmd_shell=cmd; fi])
 dnl Too bad _AS_PATH_WALK is not public.
     M4_save_IFS=$IFS; IFS=$PATH_SEPARATOR
     for M4_dir in `if (command -p getconf PATH) 2>/dev/null ; then
         command -p getconf PATH
       else
         echo "/bin$PATH_SEPARATOR$PATH"
       fi`
     do
       IFS=$M4_save_IFS
       test -z "$M4_dir" && continue
       AS_EXECUTABLE_P(["$M4_dir/sh"]) \
         && { with_syscmd_shell=$M4_dir/sh; break; }
     done
     IFS=$M4_save_IFS
   fi
 fi
 AC_MSG_RESULT([$with_syscmd_shell])
 AC_DEFINE_UNQUOTED([SYSCMD_SHELL], ["$with_syscmd_shell"],
   [Shell used by syscmd and esyscmd, must accept -c argument.])

 M4_WITH_DMALLOC

 AC_CONFIG_COMMANDS([stamp-h], [[test -z "$CONFIG_HEADERS" || date > stamp-h]])

 AS_CASE([$host], [*-*-os2*], [OS2_LDFLAGS="-Zargs-resp"])
 AC_SUBST([OS2_LDFLAGS])

 AC_CONFIG_FILES([Makefile
                  doc/Makefile
                  lib/Makefile
                  src/Makefile
                  tests/Makefile
                  checks/Makefile
                  examples/Makefile
 ])

 AC_OUTPUT
	# Configure template for GNU M4. --Autoconf--
	# Copyright (C) 1991, 1993-1994, 2004-2014, 2016 Free Software
	# Foundation, Inc.
	#
	# This file is part of GNU M4.
	#
	# GNU M4 is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# GNU M4 is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	AC_PREREQ([2.62])
	AC_INIT([GNU M4], m4_esyscmd([build-aux/git-version-gen .tarball-version]),
	[bug-m4@gnu.org])
	AC_CONFIG_AUX_DIR([build-aux])

	AM_INIT_AUTOMAKE([1.11.6 dist-bzip2 dist-xz color-tests parallel-tests
	silent-rules subdir-objects gnu])
	AM_SILENT_RULES([yes]) # make --enable-silent-rules the default.

	m4_pattern_forbid([^M4_[A-Z]])

	AC_CONFIG_SRCDIR([src/m4.h])
	AC_CONFIG_HEADERS([lib/config.h:lib/config.hin])

	AC_PROG_CC
	AC_DEFUN([gl_CXX_CHOICE_DEFAULT_NO])
	M4_EARLY

	# Maintainer note - comment this line out if you plan to rerun
	# GNULIB_POSIXCHECK testing to see if M4 should be using more modules.
	# Leave it uncommented for normal releases, for faster ./configure.
	gl_ASSERT_NO_GNULIB_POSIXCHECK

	# M4 is single-threaded; so we can optimize gnulib code by using this:
	gl_DISABLE_THREADS

	AC_ARG_ENABLE([gcc-warnings],
	[AS_HELP_STRING([--enable-gcc-warnings],
	[turn on lots of GCC warnings (for developers)])],
	[case $enableval in
	yes\|no) ;;
	*) AC_MSG_ERROR([bad value $enableval for gcc-warnings option]) ;;
	esac
	gl_gcc_warnings=$enableval],
	[if test -f "$srcdir"/.tarball-version; then
	gl_gcc_warnings=no
	else
	gl_gcc_warnings=yes
	fi]
	)

	if test "$gl_gcc_warnings" = yes; then
	gl_WARN_ADD([-Werror], [WERROR_CFLAGS])
	AC_SUBST([WERROR_CFLAGS])

	# We use '#pragma GCC diagnostic push' to silence some
	# warnings, but older gcc doesn't support this.
	AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
	[M4_cv_gcc_pragma_push_works], [
	save_CFLAGS=$CFLAGS
	CFLAGS='-Wunknown-pragmas -Werror'
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#pragma GCC diagnostic push
	#pragma GCC diagnostic pop
	]])],
	[M4_cv_gcc_pragma_push_works=yes],
	[M4_cv_gcc_pragma_push_works=no])
	CFLAGS=$save_CFLAGS])

	# This, $nw, is the list of warnings we disable.
	nw=
	nw="$nw -Waggregate-return" # K&R is anachronistic
	nw="$nw -Wtraditional-conversion" # K&R is anachronistic
	nw="$nw -Wundef" # K&R is anachronistic
	nw="$nw -Wtraditional" # K&R is anachronistic
	nw="$nw -Wlong-long" # C90 is anachronistic
	nw="$nw -Wsystem-headers" # Don't let system headers trigger warnings
	nw="$nw -Wpadded" # Our structs are not packed
	nw="$nw -Wconversion" # Too many warnings for now
	nw="$nw -Wsign-conversion" # Too many warnings for now
	nw="$nw -Wcast-qual" # Too many warnings for now
	nw="$nw -Wswitch-enum" # Too many warnings for now
	# gcc 4.4.6 complains enum-compare is C++ only; gcc 4.7.0 implies it in -Wall
	nw="$nw -Wenum-compare"

	# Gnulib uses '#pragma GCC diagnostic push' to silence some
	# warnings, but older gcc doesn't support this.
	AC_CACHE_CHECK([whether pragma GCC diagnostic push works],
	[M4_cv_gcc_pragma_push_works], [
	save_CFLAGS=$CFLAGS
	CFLAGS='-Wunknown-pragmas -Werror'
	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
	#pragma GCC diagnostic push
	#pragma GCC diagnostic pop
	]])],
	[M4_cv_gcc_pragma_push_works=yes],
	[M4_cv_gcc_pragma_push_works=no])
	CFLAGS=$save_CFLAGS])
	if test $M4_cv_gcc_pragma_push_works = no; then
	nw="$nw -Wmissing-prototypes"
	nw="$nw -Wmissing-declarations"
	nw="$nw -Wunreachable-code"
	fi

	gl_MANYWARN_ALL_GCC([ws])
	gl_MANYWARN_COMPLEMENT([ws], [$ws], [$nw])
	for w in $ws; do
	gl_WARN_ADD([$w])
	done

	# Gnulib turns on -Wformat=2, which implies -Wformat-nonliteral, but
	# we temporarily override it in format.c if possible.
	if test $M4_cv_gcc_pragma_push_works = no; then
	gl_WARN_ADD([-Wno-format-nonliteral])
	fi

	AC_SUBST([WARN_CFLAGS])

	AH_VERBATIM([FORTIFY_SOURCE],
	[/* Enable compile-time and run-time bounds-checking, and some warnings,
	without upsetting newer glibc. */
	#if defined __OPTIMIZE__ && __OPTIMIZE__
	# define _FORTIFY_SOURCE 2
	#endif
	])
	fi

	# Tandem/NSK is broken - it has 'long long int' but not
	# 'unsigned long long int', which confuses assumptions made by gnulib.
	# Simply pretend that neither type exists if both do not work.
	AC_TYPE_LONG_LONG_INT
	AC_TYPE_UNSIGNED_LONG_LONG_INT
	if test $ac_cv_type_long_long_int:$ac_cv_type_unsigned_long_long_int = yes:no
	then
	ac_cv_type_long_long_int=no
	AC_DEFINE([HAVE_LONG_LONG_INT], 0,
	[Define to 1 if the system has the type `long long int'.])
	fi

	M4_INIT

	AC_CACHE_CHECK([whether an open file can be renamed],
	[M4_cv_func_rename_open_file_works],
	[AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],
	[FILE *f = fopen ("conftest.1", "w+");
	int result = rename ("conftest.1", "conftest.2");
	fclose (f); remove ("conftest.1"); remove ("conftest.2");
	return result;])],
	[M4_cv_func_rename_open_file_works=yes],
	[M4_cv_func_rename_open_file_works=no],
	[M4_cv_func_rename_open_file_works='guessing no'])])
	if test "$M4_cv_func_rename_open_file_works" = yes ; then
	M4_rename_open_works=1
	else
	M4_rename_open_works=0
	fi
	AC_DEFINE_UNQUOTED([RENAME_OPEN_FILE_WORKS], [$M4_rename_open_works],
	[Define to 1 if a file can be renamed while open, or to 0 if not.])

	dnl Don't let changeword get in our way, if bootstrapping with a version of
	dnl m4 that already turned the feature on.
	m4_ifdef([changeword], [m4_undefine([changeword])])dnl

	AC_MSG_CHECKING([[if changeword is wanted]])
	AC_ARG_ENABLE([changeword],
	[AS_HELP_STRING([--enable-changeword],
	[enable -W and changeword() builtin])],
	[if test "$enableval" = yes; then
	AC_MSG_RESULT([yes])
	AC_DEFINE([ENABLE_CHANGEWORD], [1],
	[Define to 1 if the changeword(REGEXP) functionality is wanted])
	else
	AC_MSG_RESULT([no])
	fi], [AC_MSG_RESULT([no])])

	AC_MSG_CHECKING([[which shell to use for syscmd]])
	AC_ARG_WITH([syscmd-shell],
	[AS_HELP_STRING([--with-syscmd-shell], [shell used by syscmd [/bin/sh]])],
	[case $withval in
	yes[)] with_syscmd_shell=no;;
	esac], [with_syscmd_shell=no])
	if test "$with_syscmd_shell" = no ; then
	with_syscmd_shell=/bin/sh
	if test "$cross_compiling" != yes ; then
	dnl Give mingw a default that is more likely to be available.
	AS_IF([AS_EXECUTABLE_P([/bin/sh$EXEEXT])], [],
	[if (cmd /c) 2>/dev/null; then with_syscmd_shell=cmd; fi])
	dnl Too bad _AS_PATH_WALK is not public.
	M4_save_IFS=$IFS; IFS=$PATH_SEPARATOR
	for M4_dir in `if (command -p getconf PATH) 2>/dev/null ; then
	command -p getconf PATH
	else
	echo "/bin$PATH_SEPARATOR$PATH"
	fi`
	do
	IFS=$M4_save_IFS
	test -z "$M4_dir" && continue
	AS_EXECUTABLE_P(["$M4_dir/sh"]) \
	&& { with_syscmd_shell=$M4_dir/sh; break; }
	done
	IFS=$M4_save_IFS
	fi
	fi
	AC_MSG_RESULT([$with_syscmd_shell])
	AC_DEFINE_UNQUOTED([SYSCMD_SHELL], ["$with_syscmd_shell"],
	[Shell used by syscmd and esyscmd, must accept -c argument.])

	M4_WITH_DMALLOC

	AC_CONFIG_COMMANDS([stamp-h], [[test -z "$CONFIG_HEADERS" \|\| date > stamp-h]])

	AS_CASE([$host], [--os2*], [OS2_LDFLAGS="-Zargs-resp"])
	AC_SUBST([OS2_LDFLAGS])

	AC_CONFIG_FILES([Makefile
	doc/Makefile
	lib/Makefile
	src/Makefile
	tests/Makefile
	checks/Makefile
	examples/Makefile
	])

	AC_OUTPUT