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# are met:
#
#   - Redistributions of source code must retain the above copyright
#     notice, this list of conditions and the following disclaimer.
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########################################################################
#
# Sample GNU Makefile for building JVMTI Demo gctest
#
#  Example uses:    
#       gnumake JDK=<java_home> OSNAME=solaris [OPT=true] [LIBARCH=sparc]
#       gnumake JDK=<java_home> OSNAME=solaris [OPT=true] [LIBARCH=sparcv9]
#       gnumake JDK=<java_home> OSNAME=linux   [OPT=true]
#       gnumake JDK=<java_home> OSNAME=win32   [OPT=true]
#
########################################################################

# Source lists
LIBNAME=gctest
SOURCES=gctest.c ../agent_util/agent_util.c

# Solaris Studio C Compiler Version 12.4
ifeq ($(OSNAME), solaris)
    # Sun Solaris Compiler options needed
    COMMON_FLAGS=-mt -KPIC
    # Options that help find errors
    COMMON_FLAGS+= -Xa -v -xc99=%none
    # Check LIBARCH for any special compiler options
    LIBARCH=$(shell uname -p)
    ifeq ($(LIBARCH), sparc)
        COMMON_FLAGS+=-xarch=v8 -xregs=no%appl
    endif
    ifeq ($(LIBARCH), sparcv9)
        COMMON_FLAGS+=-xarch=v9 -xregs=no%appl
    endif
    ifeq ($(OPT), true)
        CFLAGS=-xO2 $(COMMON_FLAGS) 
    else
        CFLAGS=-g $(COMMON_FLAGS)
    endif
    # Object files needed to create library
    OBJECTS=$(SOURCES:%.c=%.o)
    # Library name and options needed to build it
    LIBRARY=lib$(LIBNAME).so
    LDFLAGS=-z defs -ztext
    # Libraries we are dependent on
    LIBRARIES= -lc
    # Building a shared library
    LINK_SHARED=$(LINK.c) -G -o $@
endif

# Linux GNU C Compiler
ifeq ($(OSNAME), linux)
    # GNU Compiler options needed to build it
    COMMON_FLAGS=-fno-strict-aliasing -fPIC -fno-omit-frame-pointer
    # Options that help find errors
    COMMON_FLAGS+= -W -Wall  -Wno-unused -Wno-parentheses
    ifeq ($(OPT), true)
        CFLAGS=-O2 $(COMMON_FLAGS) 
    else
        CFLAGS=-g $(COMMON_FLAGS) 
    endif
    # Object files needed to create library
    OBJECTS=$(SOURCES:%.c=%.o)
    # Library name and options needed to build it
    LIBRARY=lib$(LIBNAME).so
    LDFLAGS=-Wl,-soname=$(LIBRARY) -static-libgcc
    # Libraries we are dependent on
    LIBRARIES=-lc
    # Building a shared library
    LINK_SHARED=$(LINK.c) -shared -o $@
endif

# Windows Microsoft C/C++ Optimizing Compiler Version 12
ifeq ($(OSNAME), win32)
    CC=cl
    # Compiler options needed to build it
    COMMON_FLAGS=-Gy -DWIN32
    # Options that help find errors
    COMMON_FLAGS+=-W0 -WX
    ifeq ($(OPT), true)
        CFLAGS= -Ox -Op -Zi $(COMMON_FLAGS) 
    else
        CFLAGS= -Od -Zi $(COMMON_FLAGS) 
    endif
    # Object files needed to create library
    OBJECTS=$(SOURCES:%.c=%.obj)
    # Library name and options needed to build it
    LIBRARY=$(LIBNAME).dll
    LDFLAGS=
    # Libraries we are dependent on
    LIBRARIES=
    # Building a shared library
    LINK_SHARED=link -dll -out:$@
endif

# Common -I options
CFLAGS += -I.
CFLAGS += -I../agent_util
CFLAGS += -I$(JDK)/include -I$(JDK)/include/$(OSNAME)

# Default rule
all: $(LIBRARY)

# Build native library
$(LIBRARY): $(OBJECTS)
	$(LINK_SHARED) $(OBJECTS) $(LIBRARIES)

# Cleanup the built bits
clean:
	rm -f $(LIBRARY) $(OBJECTS)

# Simple tester
test: all
	LD_LIBRARY_PATH=`pwd` $(JDK)/bin/java -agentlib:$(LIBNAME) -version

# Compilation rule only needed on Windows
ifeq ($(OSNAME), win32)
%.obj: %.c
	$(COMPILE.c) $<
endif