# Autodetermine target if not set
ifeq ($(TARGET),)
	ifeq ($(shell uname),Darwin)
		TARGET := darwin
	else ifeq ($(shell uname),Linux)
		TARGET := linux
	else ifeq ($(findstring CYGWIN,$(shell uname)),CYGWIN)
		TARGET := windows
	else ifeq ($(findstring MINGW,$(shell uname)),MINGW)
		TARGET := windows
	endif
endif

############################################
# Google NaCl target
ifeq ($(TARGET),nacl)
	ifndef NACL_SDK_ROOT
		$(error Set NACL_SDK_ROOT environment variable)
	endif
	ifeq ($(findstring CYGWIN,$(shell uname)),CYGWIN)
		NACL_SDK_ROOT := $(shell cygpath -u "$(NACL_SDK_ROOT)")
	endif
	
	OSNAME := $(shell python $(NACL_SDK_ROOT)/tools/getos.py)
	NACL_TOOLCHAIN := $(abspath $(NACL_SDK_ROOT)/toolchain/$(OSNAME)_x86_newlib)
	CXX := $(NACL_TOOLCHAIN)/bin/i686-nacl-g++
	CC := $(NACL_TOOLCHAIN)/bin/i686-nacl-gcc
	AR := $(NACL_TOOLCHAIN)/bin/i686-nacl-ar
	STATICLIB_EXT := a
	DYNAMICLIB_EXT := nexe
	LIBRARY_PREFIX := lib
	LDLIBS += -lppapi_cpp -lppapi 
	GLOBAL_INCLUDES := -I../zlib/zlib_library -I$(NACL_TOOLCHAIN)/i686-nacl/usr/include
	ZLIB_BUILD := defined
	CFLAGS += -D__int64="long long"
	CXXFLAGS += -D__int64="long long" -std=gnu++0x
	DYNAMICLIB_FLAGS := -shared
############################################
# MacOSX/Darwin target
else ifeq ($(TARGET),darwin)
	MACOSX_TOOLCHAIN_ROOT := /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer
	MACOSX_SDK := $(IOS_TOOLCHAIN_ROOT)/SDKs/MacOSX10.6.sdk/
	ifeq ($(JAVA_HOME),)
		JAVA_HOME = /System/Library/Frameworks/JavaVM.framework/Versions/Current/Headers
	endif
	
	# Skia on Darwin supports only i386
	ARCH := i386
	CXXFLAGS += -arch $(ARCH)
	CFLAGS += -arch $(ARCH)
	
	CXX := /usr/bin/g++
	CC := /usr/bin/gcc
	AR := /usr/bin/ar
	GLOBAL_INCLUDES := -I../zlib/zlib_library
	ZLIB_BUILD := defined
	STATICLIB_EXT := a
	DYNAMICLIB_EXT := dylib
	LIBRARY_PREFIX := lib
	DYNAMICLIB_FLAGS := -dynamiclib
############################################
# iOS target
else ifeq ($(TARGET),ios)
	IOS_TOOLCHAIN_ROOT := /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer
	IOS_SDK := $(IOS_TOOLCHAIN_ROOT)/SDKs/iPhoneOS5.1.sdk/
	ifeq ($(ARCH),)
		ARCH := armv6
	endif

	CXX := $(IOS_TOOLCHAIN_ROOT)/usr/bin/arm-apple-darwin10-llvm-g++-4.2
	CC := $(IOS_TOOLCHAIN_ROOT)/usr/bin/arm-apple-darwin10-llvm-gcc-4.2
	AR := $(IOS_TOOLCHAIN_ROOT)/usr/bin/ar
	GLOBAL_INCLUDES := -I../zlib/zlib_library
	ZLIB_BUILD := defined
	STATICLIB_EXT := a
	DYNAMICLIB_EXT := dylib
	LIBRARY_PREFIX := lib
	CXXFLAGS += -isysroot $(IOS_SDK)
	CFLAGS += -isysroot $(IOS_SDK)
	DYNAMICLIB_FLAGS := -dynamiclib
	LDFLAGS := # empty
# -arch armv6
############################################
### EVERYTHING ELSE REQUIRES JAVA_HOME #####
else

# Just don't ask
	ifndef JAVA_HOME
$(error Set JAVA_HOME environment variable)
	endif

############################################
# Windows via MinGW/Linux and MinGW/Cygwin target
	ifeq ($(TARGET),windows)
		CXX := i686-w64-mingw32-g++
		CC := i686-w64-mingw32-gcc
		AR := i686-w64-mingw32-ar
		GLOBAL_INCLUDES := -I../zlib/zlib_library
		ZLIB_BUILD := defined
		STATICLIB_EXT := lib
		DYNAMICLIB_EXT := dll
		LIBRARY_PREFIX := # empty
		LDFLAGS += -Wl,--kill-at -static-libstdc++ -static-libgcc
		CFLAGS += # empty
		CXXFLAGS += -std=gnu++0x
		DYNAMICLIB_FLAGS := -shared
		ifeq ($(findstring CYGWIN,$(shell uname)),CYGWIN)
			# Latest MinGW compiler under Cygwin needs this
			CFLAGS += -D__int64="long long"
			CXXFLAGS += -D__int64="long long"
		endif
###########################################
# Default target
	else
		STATICLIB_EXT := a
		DYNAMICLIB_EXT := so
		LIBRARY_PREFIX := lib
		DYNAMICLIB_FLAGS := -shared -Wl,-Bsymbolic-functions -Wl,--dynamic-list-cpp-new
		CFLAGS += # empty
		CXXFLAGS += -std=gnu++0x
	endif

endif


############################################
# CPU architectures support

# Make default definitions
ifeq ($(ARCH),)
	ifeq ($(findstring CYGWIN,$(shell uname)),CYGWIN)
		# Cygwin returns 'unknown'
		ARCH := i386
	else
		ARCH := $(shell uname -i)
		ifeq ($(ARCH),unknown)
			ARCH := $(shell uname -m)
		endif
	endif
endif

# Modify compiler flags
ifeq ($(ARCH),i386)
	CFLAGS += -m32
	CXXFLAGS += -m32
	LDFLAGS += -m32
else ifeq ($(ARCH),x86_64)
	CFLAGS += -m64 -fPIC
	CXXFLAGS += -m64 -fPIC
	LDFLAGS += -m64 -fPIC
else ifeq ($(ARCH),armv6)
else 
$(error Undefined ARCH $(ARCH))  
endif