CMakeLists.txt - third_party/libgit2 - Git at Google

 # CMake build script for the libgit2 project
 #
 # Building (out of source build):
 # > mkdir build && cd build
 # > cmake .. [-DSETTINGS=VALUE]
 # > cmake --build .
 #
 # Testing:
 # > ctest -V
 #
 # Install:
 # > cmake --build . --target install

 PROJECT(libgit2 C)
 CMAKE_MINIMUM_REQUIRED(VERSION 2.6)

 # Add find modules to the path
 SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")

 # Build options
 #
 OPTION( SONAME				"Set the (SO)VERSION of the target"		ON  )
 OPTION( BUILD_SHARED_LIBS	"Build Shared Library (OFF for Static)"	ON  )
 OPTION( THREADSAFE			"Build libgit2 as threadsafe"			OFF )
 OPTION( BUILD_CLAR			"Build Tests using the Clar suite"		ON  )
 OPTION( BUILD_EXAMPLES		"Build library usage example apps"		OFF )
 OPTION( TAGS				"Generate tags"							OFF )
 OPTION( PROFILE				"Generate profiling information"		OFF )
 OPTION( ENABLE_TRACE		"Enables tracing support"				OFF )
 OPTION( LIBGIT2_FILENAME	"Name of the produced binary" OFF )

 IF(MSVC)
 	# This option is only availalbe when building with MSVC. By default,
 	# libgit2 is build using the stdcall calling convention, as that's what
 	# the CLR expects by default and how the Windows API is built.
 	#
 	# If you are writing a C or C++ program and want to link to libgit2, you
 	# have to either:
 	# - Add /Gz to the compiler options of _your_ program / library.
 	# - Turn this off by invoking CMake with the "-DSTDCALL=Off" argument.
 	#
 	OPTION( STDCALL			"Build libgit2 with the __stdcall convention"	ON  )

 	# This option must match the settings used in your program, in particular if you
 	# are linking statically
 	OPTION( STATIC_CRT		"Link the static CRT libraries"	ON  )
 ENDIF()

 # Installation paths
 #
 SET(BIN_INSTALL_DIR bin CACHE PATH "Where to install binaries to.")
 SET(LIB_INSTALL_DIR lib CACHE PATH "Where to install libraries to.")
 SET(INCLUDE_INSTALL_DIR include CACHE PATH "Where to install headers to.")

 FUNCTION(TARGET_OS_LIBRARIES target)
 	IF(WIN32)
 		TARGET_LINK_LIBRARIES(${target} ws2_32)
 	ELSEIF(CMAKE_SYSTEM_NAME MATCHES "(Solaris|SunOS)")
 		TARGET_LINK_LIBRARIES(${target} socket nsl)
 	ENDIF ()
 	IF(THREADSAFE)
 		TARGET_LINK_LIBRARIES(${target} ${CMAKE_THREAD_LIBS_INIT})
 	ENDIF()
 ENDFUNCTION()

 # For the MSVC IDE, this function splits up the source files like windows
 # explorer does. This is esp. useful with the libgit2_clar project, were
 # usually 2 or more files share the same name.  Sadly, this file grouping
 # is a per-directory option in cmake and not per-target, resulting in
 # empty virtual folders "tests-clar" for the git2.dll
 FUNCTION(MSVC_SPLIT_SOURCES target)
 	IF(MSVC_IDE)
 		GET_TARGET_PROPERTY(sources ${target} SOURCES)
 		FOREACH(source ${sources})
 			IF(source MATCHES ".*/")
 				STRING(REPLACE ${CMAKE_CURRENT_SOURCE_DIR}/ "" rel ${source})
 				IF(rel)
 					STRING(REGEX REPLACE "/([^/]*)$" "" rel ${rel})
 					IF(rel)
 						STRING(REPLACE "/" "\\\\" rel ${rel})
 						SOURCE_GROUP(${rel} FILES ${source})
 					ENDIF()
 				ENDIF()
 			ENDIF()
 		ENDFOREACH()
 	ENDIF()
 ENDFUNCTION()

 FILE(STRINGS "include/git2/version.h" GIT2_HEADER REGEX "^#define LIBGIT2_VERSION \"[^\"]*\"$")

 STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"([0-9]+).*$" "\\1" LIBGIT2_VERSION_MAJOR "${GIT2_HEADER}")
 STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_VERSION_MINOR  "${GIT2_HEADER}")
 STRING(REGEX REPLACE "^.*LIBGIT2_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).*$" "\\1" LIBGIT2_VERSION_REV "${GIT2_HEADER}")
 SET(LIBGIT2_VERSION_STRING "${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}.${LIBGIT2_VERSION_REV}")

 # Find required dependencies
 INCLUDE_DIRECTORIES(src include)

 IF (WIN32 AND NOT MINGW)
 	ADD_DEFINITIONS(-DGIT_WINHTTP)
 ELSE ()
 	IF (NOT AMIGA)
 		FIND_PACKAGE(OpenSSL)
 	ENDIF ()

 	FIND_PACKAGE(HTTP_Parser QUIET)
 	IF (HTTP_PARSER_FOUND AND HTTP_PARSER_VERSION_MAJOR EQUAL 2)
 		INCLUDE_DIRECTORIES(${HTTP_PARSER_INCLUDE_DIRS})
 		LINK_LIBRARIES(${HTTP_PARSER_LIBRARIES})
 	ELSE()
 		MESSAGE("http-parser was not found or is too old; using bundled 3rd-party sources.")
 		INCLUDE_DIRECTORIES(deps/http-parser)
 		FILE(GLOB SRC_HTTP deps/http-parser/*.c)
 	ENDIF()
 ENDIF()

 # Specify sha1 implementation
 IF (WIN32 AND NOT MINGW AND NOT SHA1_TYPE STREQUAL "builtin")
 	ADD_DEFINITIONS(-DWIN32_SHA1)
 	FILE(GLOB SRC_SHA1 src/hash/hash_win32.c)
 ELSEIF (OPENSSL_FOUND AND NOT SHA1_TYPE STREQUAL "builtin")
 	ADD_DEFINITIONS(-DOPENSSL_SHA1)
 ELSE()
 	FILE(GLOB SRC_SHA1 src/hash/hash_generic.c)
 ENDIF()

 # Enable tracing
 IF (ENABLE_TRACE STREQUAL "ON")
 	ADD_DEFINITIONS(-DGIT_TRACE)
 ENDIF()

 # Include POSIX regex when it is required
 IF(WIN32 OR AMIGA)
 	INCLUDE_DIRECTORIES(deps/regex)
 	SET(SRC_REGEX deps/regex/regex.c)
 ENDIF()

 # Optional external dependency: zlib
 # It's optional, but FIND_PACKAGE gives a warning that looks more like an
 # error.
 FIND_PACKAGE(ZLIB QUIET)
 IF (ZLIB_FOUND)
 	INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIRS})
 	LINK_LIBRARIES(${ZLIB_LIBRARIES})
 	# Fake the message CMake would have shown
 	MESSAGE("-- Found zlib: ${ZLIB_LIBRARY}")
 ELSE()
 	MESSAGE( "zlib was not found; using bundled 3rd-party sources." )
 	INCLUDE_DIRECTORIES(deps/zlib)
 	ADD_DEFINITIONS(-DNO_VIZ -DSTDC -DNO_GZIP)
 	FILE(GLOB SRC_ZLIB deps/zlib/*.c)
 ENDIF()

 IF(NOT LIBSSH2_LIBRARY)
 	FIND_PACKAGE(LIBSSH2 QUIET)
 ENDIF()
 IF (LIBSSH2_FOUND)
 	ADD_DEFINITIONS(-DGIT_SSH)
 	INCLUDE_DIRECTORIES(${LIBSSH2_INCLUDE_DIR})
 	SET(SSH_LIBRARIES ${LIBSSH2_LIBRARIES})
 ENDIF()

 # Platform specific compilation flags
 IF (MSVC)

 	STRING(REPLACE "/Zm1000" " " CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")

 	# /GF - String pooling
 	# /MP - Parallel build
 	SET(CMAKE_C_FLAGS "/GF /MP /nologo ${CMAKE_C_FLAGS}")

 	IF (STDCALL)
 		# /Gz - stdcall calling convention
 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Gz")
 	ENDIF ()

 	IF (STATIC_CRT)
 		SET(CRT_FLAG_DEBUG "/MTd")
 		SET(CRT_FLAG_RELEASE "/MT")
 	ELSE()
 		SET(CRT_FLAG_DEBUG "/MDd")
 		SET(CRT_FLAG_RELEASE "/MD")
 	ENDIF()

 	# /Zi - Create debugging information
 	# /Od - Disable optimization
 	# /D_DEBUG - #define _DEBUG
 	# /MTd - Statically link the multithreaded debug version of the CRT
 	# /MDd - Dynamically link the multithreaded debug version of the CRT
 	# /RTC1 - Run time checks
 	SET(CMAKE_C_FLAGS_DEBUG "/Zi /Od /D_DEBUG /RTC1 ${CRT_FLAG_DEBUG}")

 	# /DNDEBUG - Disables asserts
 	# /MT - Statically link the multithreaded release version of the CRT
 	# /MD - Dynamically link the multithreaded release version of the CRT
 	# /O2 - Optimize for speed
 	# /Oy - Enable frame pointer omission (FPO) (otherwise CMake will automatically turn it off)
 	# /GL - Link time code generation (whole program optimization)
 	# /Gy - Function-level linking
 	SET(CMAKE_C_FLAGS_RELEASE "/DNDEBUG /O2 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")

 	# /Oy- - Disable frame pointer omission (FPO)
 	SET(CMAKE_C_FLAGS_RELWITHDEBINFO "/DNDEBUG /Zi /O2 /Oy- /GL /Gy ${CRT_FLAG_RELEASE}")

 	# /O1 - Optimize for size
 	SET(CMAKE_C_FLAGS_MINSIZEREL "/DNDEBUG /O1 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")

 	# /DYNAMICBASE - Address space load randomization (ASLR)
 	# /NXCOMPAT - Data execution prevention (DEP)
 	# /LARGEADDRESSAWARE - >2GB user address space on x86
 	# /VERSION - Embed version information in PE header
 	SET(CMAKE_EXE_LINKER_FLAGS "/DYNAMICBASE /NXCOMPAT /LARGEADDRESSAWARE /VERSION:${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}")

 	# /DEBUG - Create a PDB
 	# /LTCG - Link time code generation (whole program optimization)
 	# /OPT:REF /OPT:ICF - Fold out duplicate code at link step
 	# /INCREMENTAL:NO - Required to use /LTCG
 	# /DEBUGTYPE:cv,fixup - Additional data embedded in the PDB (requires /INCREMENTAL:NO, so not on for Debug)
 	SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "/DEBUG")
 	SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")
 	SET(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "/DEBUG /RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO /DEBUGTYPE:cv,fixup")
 	SET(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")

 	# Same linker settings for DLL as EXE
 	SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
 	SET(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG}")
 	SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
 	SET(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
 	SET(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}")

 	SET(WIN_RC "src/win32/git2.rc")

    # Precompiled headers

 ELSE ()
 	SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes ${CMAKE_C_FLAGS}")

 	IF (WIN32 AND NOT CYGWIN)
 		SET(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")
 	ENDIF ()

 	IF (MINGW) # MinGW always does PIC and complains if we tell it to
 		STRING(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
 		# MinGW >= 3.14 uses the C99-style stdio functions
 		# automatically, but forks like mingw-w64 still want
 		# us to define this in order to use them
 		ADD_DEFINITIONS(-D__USE_MINGW_ANSI_STDIO=1)

 	ELSEIF (BUILD_SHARED_LIBS)
 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fPIC")
 	ENDIF ()
 	IF (APPLE) # Apple deprecated OpenSSL
 		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations")
 	ENDIF ()
 	IF (PROFILE)
 		SET(CMAKE_C_FLAGS "-pg ${CMAKE_C_FLAGS}")
 		SET(CMAKE_EXE_LINKER_FLAGS "-pg ${CMAKE_EXE_LINKER_FLAGS}")
 	ENDIF ()
 ENDIF()

 IF( NOT CMAKE_CONFIGURATION_TYPES )
 	# Build Debug by default
 	IF (NOT CMAKE_BUILD_TYPE)
 		SET(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel." FORCE)
 	ENDIF ()
 ELSE()
 	# Using a multi-configuration generator eg MSVC or Xcode
 	# that uses CMAKE_CONFIGURATION_TYPES and not CMAKE_BUILD_TYPE
 ENDIF()

 IF (OPENSSL_FOUND)
   ADD_DEFINITIONS(-DGIT_SSL)
   INCLUDE_DIRECTORIES(${OPENSSL_INCLUDE_DIR})
   SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES})
 ENDIF()

 IF (THREADSAFE)
 	IF (NOT WIN32)
 		find_package(Threads REQUIRED)
 	ENDIF()

 	ADD_DEFINITIONS(-DGIT_THREADS)
 ENDIF()

 ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=64)

 # Collect sourcefiles
 FILE(GLOB SRC_H include/git2/*.h)

 # On Windows use specific platform sources
 IF (WIN32 AND NOT CYGWIN)
 	ADD_DEFINITIONS(-DWIN32 -D_WIN32_WINNT=0x0501)
 	FILE(GLOB SRC_OS src/win32/*.c)
 ELSEIF (AMIGA)
 	ADD_DEFINITIONS(-DNO_ADDRINFO -DNO_READDIR_R)
 	FILE(GLOB SRC_OS src/amiga/*.c)
 ELSE()
 	FILE(GLOB SRC_OS src/unix/*.c)
 ENDIF()
 FILE(GLOB SRC_GIT2 src/*.c src/transports/*.c src/xdiff/*.c)

 # Determine architecture of the machine
 IF (CMAKE_SIZEOF_VOID_P EQUAL 8)
 	ADD_DEFINITIONS(-DGIT_ARCH_64)
 ELSEIF (CMAKE_SIZEOF_VOID_P EQUAL 4)
 	ADD_DEFINITIONS(-DGIT_ARCH_32)
 ELSE()
 	message(FATAL_ERROR "Unsupported architecture")
 ENDIF()

 # Compile and link libgit2
 ADD_LIBRARY(git2 ${SRC_GIT2} ${SRC_OS} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1} ${WIN_RC})
 TARGET_LINK_LIBRARIES(git2 ${SSL_LIBRARIES})
 TARGET_LINK_LIBRARIES(git2 ${SSH_LIBRARIES})
 TARGET_OS_LIBRARIES(git2)

 # Workaround for Cmake bug #0011240 (see http://public.kitware.com/Bug/view.php?id=11240)
 # Win64+MSVC+static libs = linker error
 IF(MSVC AND GIT_ARCH_64 AND NOT BUILD_SHARED_LIBS)
   SET_TARGET_PROPERTIES(git2 PROPERTIES STATIC_LIBRARY_FLAGS "/MACHINE:x64")
 ENDIF()

 MSVC_SPLIT_SOURCES(git2)

 IF (SONAME)
 	SET_TARGET_PROPERTIES(git2 PROPERTIES VERSION ${LIBGIT2_VERSION_STRING})
 	SET_TARGET_PROPERTIES(git2 PROPERTIES SOVERSION ${LIBGIT2_VERSION_MAJOR})
 	IF (LIBGIT2_FILENAME)
 		ADD_DEFINITIONS(-DLIBGIT2_FILENAME=\"${LIBGIT2_FILENAME}\")
 		SET_TARGET_PROPERTIES(git2 PROPERTIES OUTPUT_NAME ${LIBGIT2_FILENAME})
 	ENDIF()
 ENDIF()
 CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/libgit2.pc.in ${CMAKE_CURRENT_BINARY_DIR}/libgit2.pc @ONLY)

 IF (MSVC_IDE)
    # Precompiled headers
    SET_TARGET_PROPERTIES(git2 PROPERTIES COMPILE_FLAGS "/Yuprecompiled.h /FIprecompiled.h")
    SET_SOURCE_FILES_PROPERTIES(src/win32/precompiled.c COMPILE_FLAGS "/Ycprecompiled.h")
 ENDIF ()

 # Install
 INSTALL(TARGETS git2
 	RUNTIME DESTINATION ${BIN_INSTALL_DIR}
 	LIBRARY DESTINATION ${LIB_INSTALL_DIR}
 	ARCHIVE DESTINATION ${LIB_INSTALL_DIR}
 )
 INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/libgit2.pc DESTINATION ${LIB_INSTALL_DIR}/pkgconfig )
 INSTALL(DIRECTORY include/git2 DESTINATION ${INCLUDE_INSTALL_DIR} )
 INSTALL(FILES include/git2.h DESTINATION ${INCLUDE_INSTALL_DIR} )

 # Tests
 IF (BUILD_CLAR)
 	FIND_PACKAGE(PythonInterp REQUIRED)

 	SET(CLAR_FIXTURES "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar/resources/")
 	SET(CLAR_PATH "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar")
 	SET(CLAR_RESOURCES "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar/resources" CACHE PATH "Path to test resources.")
 	ADD_DEFINITIONS(-DCLAR_FIXTURE_PATH=\"${CLAR_FIXTURES}\")
 	ADD_DEFINITIONS(-DCLAR_RESOURCES=\"${TEST_RESOURCES}\")

 	INCLUDE_DIRECTORIES(${CLAR_PATH})
 	FILE(GLOB_RECURSE SRC_TEST ${CLAR_PATH}/*/*.c)
 	SET(SRC_CLAR "${CLAR_PATH}/main.c" "${CLAR_PATH}/clar_libgit2.c" "${CLAR_PATH}/clar.c")

 	ADD_CUSTOM_COMMAND(
 		OUTPUT ${CLAR_PATH}/clar.suite
 		COMMAND ${PYTHON_EXECUTABLE} generate.py -f -xonline .
 		DEPENDS ${SRC_TEST}
 		WORKING_DIRECTORY ${CLAR_PATH}
 	)

 	SET_SOURCE_FILES_PROPERTIES(
 		${CLAR_PATH}/clar.c
 		PROPERTIES OBJECT_DEPENDS ${CLAR_PATH}/clar.suite)

 	ADD_EXECUTABLE(libgit2_clar ${SRC_GIT2} ${SRC_OS} ${SRC_CLAR} ${SRC_TEST} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1})

 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSL_LIBRARIES})
 	TARGET_LINK_LIBRARIES(libgit2_clar ${SSH_LIBRARIES})
 	TARGET_OS_LIBRARIES(libgit2_clar)
 	MSVC_SPLIT_SOURCES(libgit2_clar)

 	IF (MSVC_IDE)
 		# Precompiled headers
 		SET_TARGET_PROPERTIES(libgit2_clar PROPERTIES COMPILE_FLAGS "/Yuprecompiled.h /FIprecompiled.h")
 	ENDIF ()

 	ENABLE_TESTING()
 	ADD_TEST(libgit2_clar libgit2_clar -ionline)
 ENDIF ()

 IF (TAGS)
 	FIND_PROGRAM(CTAGS ctags)
 	IF (NOT CTAGS)
 		message(FATAL_ERROR "Could not find ctags command")
 	ENDIF ()

 	FILE(GLOB_RECURSE SRC_ALL *.[ch])

 	ADD_CUSTOM_COMMAND(
 		OUTPUT tags
 		COMMAND ${CTAGS} -a ${SRC_ALL}
 		DEPENDS ${SRC_ALL}
 	)
 	ADD_CUSTOM_TARGET(
 		do_tags ALL
 		DEPENDS tags
 	)
 ENDIF ()

 IF (BUILD_EXAMPLES)
 	FILE(GLOB_RECURSE EXAMPLE_SRC examples/network/*.c)
 	ADD_EXECUTABLE(cgit2 ${EXAMPLE_SRC})
 	IF(WIN32)
 		TARGET_LINK_LIBRARIES(cgit2 git2)
 	ELSE()
 		TARGET_LINK_LIBRARIES(cgit2 git2 pthread)
 	ENDIF()

 	ADD_EXECUTABLE(git-diff examples/diff.c)
 	TARGET_LINK_LIBRARIES(git-diff git2)

 	ADD_EXECUTABLE(git-general examples/general.c)
 	TARGET_LINK_LIBRARIES(git-general git2)

 	ADD_EXECUTABLE(git-showindex examples/showindex.c)
 	TARGET_LINK_LIBRARIES(git-showindex git2)

 	ADD_EXECUTABLE(git-rev-list examples/rev-list.c)
 	TARGET_LINK_LIBRARIES(git-rev-list git2)
 ENDIF ()
	# CMake build script for the libgit2 project
	#
	# Building (out of source build):
	# > mkdir build && cd build
	# > cmake .. [-DSETTINGS=VALUE]
	# > cmake --build .
	#
	# Testing:
	# > ctest -V
	#
	# Install:
	# > cmake --build . --target install

	PROJECT(libgit2 C)
	CMAKE_MINIMUM_REQUIRED(VERSION 2.6)

	# Add find modules to the path
	SET(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")

	# Build options
	#
	OPTION( SONAME "Set the (SO)VERSION of the target" ON )
	OPTION( BUILD_SHARED_LIBS "Build Shared Library (OFF for Static)" ON )
	OPTION( THREADSAFE "Build libgit2 as threadsafe" OFF )
	OPTION( BUILD_CLAR "Build Tests using the Clar suite" ON )
	OPTION( BUILD_EXAMPLES "Build library usage example apps" OFF )
	OPTION( TAGS "Generate tags" OFF )
	OPTION( PROFILE "Generate profiling information" OFF )
	OPTION( ENABLE_TRACE "Enables tracing support" OFF )
	OPTION( LIBGIT2_FILENAME "Name of the produced binary" OFF )

	IF(MSVC)
	# This option is only availalbe when building with MSVC. By default,
	# libgit2 is build using the stdcall calling convention, as that's what
	# the CLR expects by default and how the Windows API is built.
	#
	# If you are writing a C or C++ program and want to link to libgit2, you
	# have to either:
	# - Add /Gz to the compiler options of _your_ program / library.
	# - Turn this off by invoking CMake with the "-DSTDCALL=Off" argument.
	#
	OPTION( STDCALL "Build libgit2 with the __stdcall convention" ON )

	# This option must match the settings used in your program, in particular if you
	# are linking statically
	OPTION( STATIC_CRT "Link the static CRT libraries" ON )
	ENDIF()

	# Installation paths
	#
	SET(BIN_INSTALL_DIR bin CACHE PATH "Where to install binaries to.")
	SET(LIB_INSTALL_DIR lib CACHE PATH "Where to install libraries to.")
	SET(INCLUDE_INSTALL_DIR include CACHE PATH "Where to install headers to.")

	FUNCTION(TARGET_OS_LIBRARIES target)
	IF(WIN32)
	TARGET_LINK_LIBRARIES(${target} ws2_32)
	ELSEIF(CMAKE_SYSTEM_NAME MATCHES "(Solaris\|SunOS)")
	TARGET_LINK_LIBRARIES(${target} socket nsl)
	ENDIF ()
	IF(THREADSAFE)
	TARGET_LINK_LIBRARIES(${target} ${CMAKE_THREAD_LIBS_INIT})
	ENDIF()
	ENDFUNCTION()

	# For the MSVC IDE, this function splits up the source files like windows
	# explorer does. This is esp. useful with the libgit2_clar project, were
	# usually 2 or more files share the same name. Sadly, this file grouping
	# is a per-directory option in cmake and not per-target, resulting in
	# empty virtual folders "tests-clar" for the git2.dll
	FUNCTION(MSVC_SPLIT_SOURCES target)
	IF(MSVC_IDE)
	GET_TARGET_PROPERTY(sources ${target} SOURCES)
	FOREACH(source ${sources})
	IF(source MATCHES ".*/")
	STRING(REPLACE ${CMAKE_CURRENT_SOURCE_DIR}/ "" rel ${source})
	IF(rel)
	STRING(REGEX REPLACE "/([^/]*)$" "" rel ${rel})
	IF(rel)
	STRING(REPLACE "/" "\\\\" rel ${rel})
	SOURCE_GROUP(${rel} FILES ${source})
	ENDIF()
	ENDIF()
	ENDIF()
	ENDFOREACH()
	ENDIF()
	ENDFUNCTION()

	FILE(STRINGS "include/git2/version.h" GIT2_HEADER REGEX "^#define LIBGIT2_VERSION \"[^\"]*\"$")

	STRING(REGEX REPLACE "^.LIBGIT2_VERSION \"([0-9]+).$" "\\1" LIBGIT2_VERSION_MAJOR "${GIT2_HEADER}")
	STRING(REGEX REPLACE "^.LIBGIT2_VERSION \"[0-9]+\\.([0-9]+).$" "\\1" LIBGIT2_VERSION_MINOR "${GIT2_HEADER}")
	STRING(REGEX REPLACE "^.LIBGIT2_VERSION \"[0-9]+\\.[0-9]+\\.([0-9]+).$" "\\1" LIBGIT2_VERSION_REV "${GIT2_HEADER}")
	SET(LIBGIT2_VERSION_STRING "${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}.${LIBGIT2_VERSION_REV}")

	# Find required dependencies
	INCLUDE_DIRECTORIES(src include)

	IF (WIN32 AND NOT MINGW)
	ADD_DEFINITIONS(-DGIT_WINHTTP)
	ELSE ()
	IF (NOT AMIGA)
	FIND_PACKAGE(OpenSSL)
	ENDIF ()

	FIND_PACKAGE(HTTP_Parser QUIET)
	IF (HTTP_PARSER_FOUND AND HTTP_PARSER_VERSION_MAJOR EQUAL 2)
	INCLUDE_DIRECTORIES(${HTTP_PARSER_INCLUDE_DIRS})
	LINK_LIBRARIES(${HTTP_PARSER_LIBRARIES})
	ELSE()
	MESSAGE("http-parser was not found or is too old; using bundled 3rd-party sources.")
	INCLUDE_DIRECTORIES(deps/http-parser)
	FILE(GLOB SRC_HTTP deps/http-parser/*.c)
	ENDIF()
	ENDIF()

	# Specify sha1 implementation
	IF (WIN32 AND NOT MINGW AND NOT SHA1_TYPE STREQUAL "builtin")
	ADD_DEFINITIONS(-DWIN32_SHA1)
	FILE(GLOB SRC_SHA1 src/hash/hash_win32.c)
	ELSEIF (OPENSSL_FOUND AND NOT SHA1_TYPE STREQUAL "builtin")
	ADD_DEFINITIONS(-DOPENSSL_SHA1)
	ELSE()
	FILE(GLOB SRC_SHA1 src/hash/hash_generic.c)
	ENDIF()

	# Enable tracing
	IF (ENABLE_TRACE STREQUAL "ON")
	ADD_DEFINITIONS(-DGIT_TRACE)
	ENDIF()

	# Include POSIX regex when it is required
	IF(WIN32 OR AMIGA)
	INCLUDE_DIRECTORIES(deps/regex)
	SET(SRC_REGEX deps/regex/regex.c)
	ENDIF()

	# Optional external dependency: zlib
	# It's optional, but FIND_PACKAGE gives a warning that looks more like an
	# error.
	FIND_PACKAGE(ZLIB QUIET)
	IF (ZLIB_FOUND)
	INCLUDE_DIRECTORIES(${ZLIB_INCLUDE_DIRS})
	LINK_LIBRARIES(${ZLIB_LIBRARIES})
	# Fake the message CMake would have shown
	MESSAGE("-- Found zlib: ${ZLIB_LIBRARY}")
	ELSE()
	MESSAGE( "zlib was not found; using bundled 3rd-party sources." )
	INCLUDE_DIRECTORIES(deps/zlib)
	ADD_DEFINITIONS(-DNO_VIZ -DSTDC -DNO_GZIP)
	FILE(GLOB SRC_ZLIB deps/zlib/*.c)
	ENDIF()

	IF(NOT LIBSSH2_LIBRARY)
	FIND_PACKAGE(LIBSSH2 QUIET)
	ENDIF()
	IF (LIBSSH2_FOUND)
	ADD_DEFINITIONS(-DGIT_SSH)
	INCLUDE_DIRECTORIES(${LIBSSH2_INCLUDE_DIR})
	SET(SSH_LIBRARIES ${LIBSSH2_LIBRARIES})
	ENDIF()

	# Platform specific compilation flags
	IF (MSVC)

	STRING(REPLACE "/Zm1000" " " CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")

	# /GF - String pooling
	# /MP - Parallel build
	SET(CMAKE_C_FLAGS "/GF /MP /nologo ${CMAKE_C_FLAGS}")

	IF (STDCALL)
	# /Gz - stdcall calling convention
	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Gz")
	ENDIF ()

	IF (STATIC_CRT)
	SET(CRT_FLAG_DEBUG "/MTd")
	SET(CRT_FLAG_RELEASE "/MT")
	ELSE()
	SET(CRT_FLAG_DEBUG "/MDd")
	SET(CRT_FLAG_RELEASE "/MD")
	ENDIF()

	# /Zi - Create debugging information
	# /Od - Disable optimization
	# /D_DEBUG - #define _DEBUG
	# /MTd - Statically link the multithreaded debug version of the CRT
	# /MDd - Dynamically link the multithreaded debug version of the CRT
	# /RTC1 - Run time checks
	SET(CMAKE_C_FLAGS_DEBUG "/Zi /Od /D_DEBUG /RTC1 ${CRT_FLAG_DEBUG}")

	# /DNDEBUG - Disables asserts
	# /MT - Statically link the multithreaded release version of the CRT
	# /MD - Dynamically link the multithreaded release version of the CRT
	# /O2 - Optimize for speed
	# /Oy - Enable frame pointer omission (FPO) (otherwise CMake will automatically turn it off)
	# /GL - Link time code generation (whole program optimization)
	# /Gy - Function-level linking
	SET(CMAKE_C_FLAGS_RELEASE "/DNDEBUG /O2 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")

	# /Oy- - Disable frame pointer omission (FPO)
	SET(CMAKE_C_FLAGS_RELWITHDEBINFO "/DNDEBUG /Zi /O2 /Oy- /GL /Gy ${CRT_FLAG_RELEASE}")

	# /O1 - Optimize for size
	SET(CMAKE_C_FLAGS_MINSIZEREL "/DNDEBUG /O1 /Oy /GL /Gy ${CRT_FLAG_RELEASE}")

	# /DYNAMICBASE - Address space load randomization (ASLR)
	# /NXCOMPAT - Data execution prevention (DEP)
	# /LARGEADDRESSAWARE - >2GB user address space on x86
	# /VERSION - Embed version information in PE header
	SET(CMAKE_EXE_LINKER_FLAGS "/DYNAMICBASE /NXCOMPAT /LARGEADDRESSAWARE /VERSION:${LIBGIT2_VERSION_MAJOR}.${LIBGIT2_VERSION_MINOR}")

	# /DEBUG - Create a PDB
	# /LTCG - Link time code generation (whole program optimization)
	# /OPT:REF /OPT:ICF - Fold out duplicate code at link step
	# /INCREMENTAL:NO - Required to use /LTCG
	# /DEBUGTYPE:cv,fixup - Additional data embedded in the PDB (requires /INCREMENTAL:NO, so not on for Debug)
	SET(CMAKE_EXE_LINKER_FLAGS_DEBUG "/DEBUG")
	SET(CMAKE_EXE_LINKER_FLAGS_RELEASE "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")
	SET(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "/DEBUG /RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO /DEBUGTYPE:cv,fixup")
	SET(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL "/RELEASE /LTCG /OPT:REF /OPT:ICF /INCREMENTAL:NO")

	# Same linker settings for DLL as EXE
	SET(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
	SET(CMAKE_SHARED_LINKER_FLAGS_DEBUG "${CMAKE_EXE_LINKER_FLAGS_DEBUG}")
	SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_EXE_LINKER_FLAGS_RELEASE}")
	SET(CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO}")
	SET(CMAKE_SHARED_LINKER_FLAGS_MINSIZEREL "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}")

	SET(WIN_RC "src/win32/git2.rc")

	# Precompiled headers

	ELSE ()
	SET(CMAKE_C_FLAGS "-D_GNU_SOURCE -Wall -Wextra -Wno-missing-field-initializers -Wstrict-aliasing=2 -Wstrict-prototypes ${CMAKE_C_FLAGS}")

	IF (WIN32 AND NOT CYGWIN)
	SET(CMAKE_C_FLAGS_DEBUG "-D_DEBUG")
	ENDIF ()

	IF (MINGW) # MinGW always does PIC and complains if we tell it to
	STRING(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
	# MinGW >= 3.14 uses the C99-style stdio functions
	# automatically, but forks like mingw-w64 still want
	# us to define this in order to use them
	ADD_DEFINITIONS(-D__USE_MINGW_ANSI_STDIO=1)

	ELSEIF (BUILD_SHARED_LIBS)
	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden -fPIC")
	ENDIF ()
	IF (APPLE) # Apple deprecated OpenSSL
	SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-deprecated-declarations")
	ENDIF ()
	IF (PROFILE)
	SET(CMAKE_C_FLAGS "-pg ${CMAKE_C_FLAGS}")
	SET(CMAKE_EXE_LINKER_FLAGS "-pg ${CMAKE_EXE_LINKER_FLAGS}")
	ENDIF ()
	ENDIF()

	IF( NOT CMAKE_CONFIGURATION_TYPES )
	# Build Debug by default
	IF (NOT CMAKE_BUILD_TYPE)
	SET(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Choose the type of build, options are: Debug Release RelWithDebInfo MinSizeRel." FORCE)
	ENDIF ()
	ELSE()
	# Using a multi-configuration generator eg MSVC or Xcode
	# that uses CMAKE_CONFIGURATION_TYPES and not CMAKE_BUILD_TYPE
	ENDIF()

	IF (OPENSSL_FOUND)
	ADD_DEFINITIONS(-DGIT_SSL)
	INCLUDE_DIRECTORIES(${OPENSSL_INCLUDE_DIR})
	SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES})
	ENDIF()

	IF (THREADSAFE)
	IF (NOT WIN32)
	find_package(Threads REQUIRED)
	ENDIF()

	ADD_DEFINITIONS(-DGIT_THREADS)
	ENDIF()

	ADD_DEFINITIONS(-D_FILE_OFFSET_BITS=64)

	# Collect sourcefiles
	FILE(GLOB SRC_H include/git2/*.h)

	# On Windows use specific platform sources
	IF (WIN32 AND NOT CYGWIN)
	ADD_DEFINITIONS(-DWIN32 -D_WIN32_WINNT=0x0501)
	FILE(GLOB SRC_OS src/win32/*.c)
	ELSEIF (AMIGA)
	ADD_DEFINITIONS(-DNO_ADDRINFO -DNO_READDIR_R)
	FILE(GLOB SRC_OS src/amiga/*.c)
	ELSE()
	FILE(GLOB SRC_OS src/unix/*.c)
	ENDIF()
	FILE(GLOB SRC_GIT2 src/.c src/transports/.c src/xdiff/*.c)

	# Determine architecture of the machine
	IF (CMAKE_SIZEOF_VOID_P EQUAL 8)
	ADD_DEFINITIONS(-DGIT_ARCH_64)
	ELSEIF (CMAKE_SIZEOF_VOID_P EQUAL 4)
	ADD_DEFINITIONS(-DGIT_ARCH_32)
	ELSE()
	message(FATAL_ERROR "Unsupported architecture")
	ENDIF()

	# Compile and link libgit2
	ADD_LIBRARY(git2 ${SRC_GIT2} ${SRC_OS} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1} ${WIN_RC})
	TARGET_LINK_LIBRARIES(git2 ${SSL_LIBRARIES})
	TARGET_LINK_LIBRARIES(git2 ${SSH_LIBRARIES})
	TARGET_OS_LIBRARIES(git2)

	# Workaround for Cmake bug #0011240 (see http://public.kitware.com/Bug/view.php?id=11240)
	# Win64+MSVC+static libs = linker error
	IF(MSVC AND GIT_ARCH_64 AND NOT BUILD_SHARED_LIBS)
	SET_TARGET_PROPERTIES(git2 PROPERTIES STATIC_LIBRARY_FLAGS "/MACHINE:x64")
	ENDIF()

	MSVC_SPLIT_SOURCES(git2)

	IF (SONAME)
	SET_TARGET_PROPERTIES(git2 PROPERTIES VERSION ${LIBGIT2_VERSION_STRING})
	SET_TARGET_PROPERTIES(git2 PROPERTIES SOVERSION ${LIBGIT2_VERSION_MAJOR})
	IF (LIBGIT2_FILENAME)
	ADD_DEFINITIONS(-DLIBGIT2_FILENAME=\"${LIBGIT2_FILENAME}\")
	SET_TARGET_PROPERTIES(git2 PROPERTIES OUTPUT_NAME ${LIBGIT2_FILENAME})
	ENDIF()
	ENDIF()
	CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/libgit2.pc.in ${CMAKE_CURRENT_BINARY_DIR}/libgit2.pc @ONLY)

	IF (MSVC_IDE)
	# Precompiled headers
	SET_TARGET_PROPERTIES(git2 PROPERTIES COMPILE_FLAGS "/Yuprecompiled.h /FIprecompiled.h")
	SET_SOURCE_FILES_PROPERTIES(src/win32/precompiled.c COMPILE_FLAGS "/Ycprecompiled.h")
	ENDIF ()

	# Install
	INSTALL(TARGETS git2
	RUNTIME DESTINATION ${BIN_INSTALL_DIR}
	LIBRARY DESTINATION ${LIB_INSTALL_DIR}
	ARCHIVE DESTINATION ${LIB_INSTALL_DIR}
	)
	INSTALL(FILES ${CMAKE_CURRENT_BINARY_DIR}/libgit2.pc DESTINATION ${LIB_INSTALL_DIR}/pkgconfig )
	INSTALL(DIRECTORY include/git2 DESTINATION ${INCLUDE_INSTALL_DIR} )
	INSTALL(FILES include/git2.h DESTINATION ${INCLUDE_INSTALL_DIR} )

	# Tests
	IF (BUILD_CLAR)
	FIND_PACKAGE(PythonInterp REQUIRED)

	SET(CLAR_FIXTURES "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar/resources/")
	SET(CLAR_PATH "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar")
	SET(CLAR_RESOURCES "${CMAKE_CURRENT_SOURCE_DIR}/tests-clar/resources" CACHE PATH "Path to test resources.")
	ADD_DEFINITIONS(-DCLAR_FIXTURE_PATH=\"${CLAR_FIXTURES}\")
	ADD_DEFINITIONS(-DCLAR_RESOURCES=\"${TEST_RESOURCES}\")

	INCLUDE_DIRECTORIES(${CLAR_PATH})
	FILE(GLOB_RECURSE SRC_TEST ${CLAR_PATH}//.c)
	SET(SRC_CLAR "${CLAR_PATH}/main.c" "${CLAR_PATH}/clar_libgit2.c" "${CLAR_PATH}/clar.c")

	ADD_CUSTOM_COMMAND(
	OUTPUT ${CLAR_PATH}/clar.suite
	COMMAND ${PYTHON_EXECUTABLE} generate.py -f -xonline .
	DEPENDS ${SRC_TEST}
	WORKING_DIRECTORY ${CLAR_PATH}
	)

	SET_SOURCE_FILES_PROPERTIES(
	${CLAR_PATH}/clar.c
	PROPERTIES OBJECT_DEPENDS ${CLAR_PATH}/clar.suite)

	ADD_EXECUTABLE(libgit2_clar ${SRC_GIT2} ${SRC_OS} ${SRC_CLAR} ${SRC_TEST} ${SRC_ZLIB} ${SRC_HTTP} ${SRC_REGEX} ${SRC_SHA1})

	TARGET_LINK_LIBRARIES(libgit2_clar ${SSL_LIBRARIES})
	TARGET_LINK_LIBRARIES(libgit2_clar ${SSH_LIBRARIES})
	TARGET_OS_LIBRARIES(libgit2_clar)
	MSVC_SPLIT_SOURCES(libgit2_clar)

	IF (MSVC_IDE)
	# Precompiled headers
	SET_TARGET_PROPERTIES(libgit2_clar PROPERTIES COMPILE_FLAGS "/Yuprecompiled.h /FIprecompiled.h")
	ENDIF ()

	ENABLE_TESTING()
	ADD_TEST(libgit2_clar libgit2_clar -ionline)
	ENDIF ()

	IF (TAGS)
	FIND_PROGRAM(CTAGS ctags)
	IF (NOT CTAGS)
	message(FATAL_ERROR "Could not find ctags command")
	ENDIF ()

	FILE(GLOB_RECURSE SRC_ALL *.[ch])

	ADD_CUSTOM_COMMAND(
	OUTPUT tags
	COMMAND ${CTAGS} -a ${SRC_ALL}
	DEPENDS ${SRC_ALL}
	)
	ADD_CUSTOM_TARGET(
	do_tags ALL
	DEPENDS tags
	)
	ENDIF ()

	IF (BUILD_EXAMPLES)
	FILE(GLOB_RECURSE EXAMPLE_SRC examples/network/*.c)
	ADD_EXECUTABLE(cgit2 ${EXAMPLE_SRC})
	IF(WIN32)
	TARGET_LINK_LIBRARIES(cgit2 git2)
	ELSE()
	TARGET_LINK_LIBRARIES(cgit2 git2 pthread)
	ENDIF()

	ADD_EXECUTABLE(git-diff examples/diff.c)
	TARGET_LINK_LIBRARIES(git-diff git2)

	ADD_EXECUTABLE(git-general examples/general.c)
	TARGET_LINK_LIBRARIES(git-general git2)

	ADD_EXECUTABLE(git-showindex examples/showindex.c)
	TARGET_LINK_LIBRARIES(git-showindex git2)

	ADD_EXECUTABLE(git-rev-list examples/rev-list.c)
	TARGET_LINK_LIBRARIES(git-rev-list git2)
	ENDIF ()