#
#	Copyright (c) 2020 Sibi Siddharthan
#

#[[

Instructions to run CMake:

cmake `relative-path-to-CMakeLists.txt` -DCMAKE_BUILD_TYPE=Release
Eg.
From the root of git source tree
	`cmake contrib/buildsystems/ `
This will build the git binaries at the root

For out of source builds, say build in 'git/git-build/'
	`mkdir git-build;cd git-build; cmake ../contrib/buildsystems/`
This will build the git binaries in git-build directory

Possible build configurations(-DCMAKE_BUILD_TYPE) with corresponding
compiler flags
Debug : -g
Release: -O3
RelWithDebInfo : -O2 -g
MinSizeRel : -Os
empty(default) :

NOTE: -DCMAKE_BUILD_TYPE is optional. For multi-config generators like Visual Studio
this option is ignored

This process generates a Makefile(Linux/*BSD/MacOS) , Visual Studio solution(Windows) by default.
Run `make` to build Git on Linux/*BSD/MacOS.
Open git.sln on Windows and build Git.

NOTE: By default CMake uses Makefile as the build tool on Linux and Visual Studio in Windows,
to use another tool say `ninja` add this to the command line when configuring.
`-G Ninja`

]]
cmake_minimum_required(VERSION 3.14)

#set the source directory to root of git
set(CMAKE_SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/../..)

find_program(SH_EXE sh)
if(NOT SH_EXE)
	message(FATAL_ERROR "sh: shell interpreter was not found in your path, please install one."
			"On Windows, you can get it as part of 'Git for Windows' install at https://gitforwindows.org/")
endif()

#Create GIT-VERSION-FILE using GIT-VERSION-GEN
if(NOT EXISTS ${CMAKE_SOURCE_DIR}/GIT-VERSION-FILE)
	message("Generating GIT-VERSION-FILE")
	execute_process(COMMAND ${SH_EXE} ${CMAKE_SOURCE_DIR}/GIT-VERSION-GEN
		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR})
endif()

#Parse GIT-VERSION-FILE to get the version
file(STRINGS ${CMAKE_SOURCE_DIR}/GIT-VERSION-FILE git_version REGEX "GIT_VERSION = (.*)")
string(REPLACE "GIT_VERSION = " "" git_version ${git_version})
string(FIND ${git_version} "GIT" location)
if(location EQUAL -1)
	string(REGEX MATCH "[0-9]*\\.[0-9]*\\.[0-9]*" git_version ${git_version})
else()
	string(REGEX MATCH "[0-9]*\\.[0-9]*" git_version ${git_version})
	string(APPEND git_version ".0") #for building from a snapshot
endif()

project(git
	VERSION ${git_version}
	LANGUAGES C)


#TODO gitk git-gui gitweb
#TODO Enable NLS on windows natively
#TODO Add pcre support

#macros for parsing the Makefile for sources and scripts
macro(parse_makefile_for_sources list_var regex)
	file(STRINGS ${CMAKE_SOURCE_DIR}/Makefile ${list_var} REGEX "^${regex} \\+=(.*)")
	string(REPLACE "${regex} +=" "" ${list_var} ${${list_var}})
	string(REPLACE "$(COMPAT_OBJS)" "" ${list_var} ${${list_var}}) #remove "$(COMPAT_OBJS)" This is only for libgit.
	string(STRIP ${${list_var}} ${list_var}) #remove trailing/leading whitespaces
	string(REPLACE ".o" ".c;" ${list_var} ${${list_var}}) #change .o to .c, ; is for converting the string into a list
	list(TRANSFORM ${list_var} STRIP) #remove trailing/leading whitespaces for each element in list
	list(REMOVE_ITEM ${list_var} "") #remove empty list elements
endmacro()

macro(parse_makefile_for_scripts list_var regex lang)
	file(STRINGS ${CMAKE_SOURCE_DIR}/Makefile ${list_var} REGEX "^${regex} \\+=(.*)")
	string(REPLACE "${regex} +=" "" ${list_var} ${${list_var}})
	string(STRIP ${${list_var}} ${list_var}) #remove trailing/leading whitespaces
	string(REPLACE " " ";" ${list_var} ${${list_var}}) #convert string to a list
	if(NOT ${lang}) #exclude for SCRIPT_LIB
		list(TRANSFORM ${list_var} REPLACE "${lang}" "") #do the replacement
	endif()
endmacro()

include(CheckTypeSize)
include(CheckCSourceRuns)
include(CheckCSourceCompiles)
include(CheckIncludeFile)
include(CheckFunctionExists)
include(CheckSymbolExists)
include(CheckStructHasMember)
include(CTest)

find_package(ZLIB REQUIRED)
find_package(CURL)
find_package(EXPAT)
find_package(Iconv)

#Don't use libintl on Windows Visual Studio and Clang builds
if(NOT (WIN32 AND (CMAKE_C_COMPILER_ID STREQUAL "MSVC" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")))
	find_package(Intl)
endif()

if(NOT Intl_FOUND)
	add_compile_definitions(NO_GETTEXT)
	if(NOT Iconv_FOUND)
		add_compile_definitions(NO_ICONV)
	endif()
endif()

include_directories(SYSTEM ${ZLIB_INCLUDE_DIRS})
if(CURL_FOUND)
	include_directories(SYSTEM ${CURL_INCLUDE_DIRS})
endif()
if(EXPAT_FOUND)
	include_directories(SYSTEM ${EXPAT_INCLUDE_DIRS})
endif()
if(Iconv_FOUND)
	include_directories(SYSTEM ${Iconv_INCLUDE_DIRS})
endif()
if(Intl_FOUND)
	include_directories(SYSTEM ${Intl_INCLUDE_DIRS})
endif()


if(WIN32 AND NOT MSVC)#not required for visual studio builds
	find_program(WINDRES_EXE windres)
	if(NOT WINDRES_EXE)
		message(FATAL_ERROR "Install windres on Windows for resource files")
	endif()
endif()

find_program(MSGFMT_EXE msgfmt)
if(NOT MSGFMT_EXE)
	message(WARNING "Text Translations won't be build")
endif()

#Force all visual studio outputs to CMAKE_BINARY_DIR
if(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_BINARY_DIR})
	set(CMAKE_RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_BINARY_DIR})
	add_compile_options(/MP)
endif()

#default behaviour
include_directories(${CMAKE_SOURCE_DIR})
add_compile_definitions(GIT_HOST_CPU="${CMAKE_SYSTEM_PROCESSOR}")
add_compile_definitions(SHA256_BLK INTERNAL_QSORT RUNTIME_PREFIX)
add_compile_definitions(NO_OPENSSL SHA1_DC SHA1DC_NO_STANDARD_INCLUDES
			SHA1DC_INIT_SAFE_HASH_DEFAULT=0
			SHA1DC_CUSTOM_INCLUDE_SHA1_C="cache.h"
			SHA1DC_CUSTOM_INCLUDE_UBC_CHECK_C="git-compat-util.h" )
list(APPEND compat_SOURCES sha1dc_git.c sha1dc/sha1.c sha1dc/ubc_check.c block-sha1/sha1.c sha256/block/sha256.c compat/qsort_s.c)


add_compile_definitions(PAGER_ENV="LESS=FRX LV=-c"
			ETC_GITATTRIBUTES="etc/gitattributes"
			ETC_GITCONFIG="etc/gitconfig"
			GIT_EXEC_PATH="libexec/git-core"
			GIT_LOCALE_PATH="share/locale"
			GIT_MAN_PATH="share/man"
			GIT_INFO_PATH="share/info"
			GIT_HTML_PATH="share/doc/git-doc"
			DEFAULT_HELP_FORMAT="html"
			DEFAULT_GIT_TEMPLATE_DIR="share/git-core/templates"
			GIT_VERSION="${PROJECT_VERSION}.GIT"
			GIT_USER_AGENT="git/${PROJECT_VERSION}.GIT"
			BINDIR="bin"
			GIT_BUILT_FROM_COMMIT="")

if(WIN32)
	set(FALLBACK_RUNTIME_PREFIX /mingw64)
	add_compile_definitions(FALLBACK_RUNTIME_PREFIX="${FALLBACK_RUNTIME_PREFIX}")
else()
	set(FALLBACK_RUNTIME_PREFIX /home/$ENV{USER})
	add_compile_definitions(FALLBACK_RUNTIME_PREFIX="${FALLBACK_RUNTIME_PREFIX}")
endif()


#Platform Specific
if(CMAKE_SYSTEM_NAME STREQUAL "Windows")
	if(CMAKE_C_COMPILER_ID STREQUAL "MSVC" OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
		include_directories(${CMAKE_SOURCE_DIR}/compat/vcbuild/include)
		add_compile_definitions(_CRT_SECURE_NO_WARNINGS _CRT_NONSTDC_NO_DEPRECATE)
	endif()
	include_directories(${CMAKE_SOURCE_DIR}/compat/win32)
	add_compile_definitions(HAVE_ALLOCA_H NO_POSIX_GOODIES NATIVE_CRLF NO_UNIX_SOCKETS WIN32
				_CONSOLE DETECT_MSYS_TTY STRIP_EXTENSION=".exe"  NO_SYMLINK_HEAD UNRELIABLE_FSTAT
				NOGDI OBJECT_CREATION_MODE=1 __USE_MINGW_ANSI_STDIO=0
				USE_NED_ALLOCATOR OVERRIDE_STRDUP MMAP_PREVENTS_DELETE USE_WIN32_MMAP
				UNICODE _UNICODE HAVE_WPGMPTR ENSURE_MSYSTEM_IS_SET)
	list(APPEND compat_SOURCES compat/mingw.c compat/winansi.c compat/win32/path-utils.c
		compat/win32/pthread.c compat/win32mmap.c compat/win32/syslog.c
		compat/win32/trace2_win32_process_info.c compat/win32/dirent.c
		compat/nedmalloc/nedmalloc.c compat/strdup.c)
	set(NO_UNIX_SOCKETS 1)

elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
	add_compile_definitions(PROCFS_EXECUTABLE_PATH="/proc/self/exe" HAVE_DEV_TTY )
	list(APPEND compat_SOURCES unix-socket.c)
endif()

set(EXE_EXTENSION ${CMAKE_EXECUTABLE_SUFFIX})

#header checks
check_include_file(libgen.h HAVE_LIBGEN_H)
if(NOT HAVE_LIBGEN_H)
	add_compile_definitions(NO_LIBGEN_H)
	list(APPEND compat_SOURCES compat/basename.c)
endif()

check_include_file(sys/sysinfo.h HAVE_SYSINFO)
if(HAVE_SYSINFO)
	add_compile_definitions(HAVE_SYSINFO)
endif()

check_c_source_compiles("
#include <alloca.h>

int main(void)
{
	char *p = (char *) alloca(2 * sizeof(int));

	if (p)
		return 0;
	return 0;
}"
HAVE_ALLOCA_H)
if(HAVE_ALLOCA_H)
	add_compile_definitions(HAVE_ALLOCA_H)
endif()

check_include_file(strings.h HAVE_STRINGS_H)
if(HAVE_STRINGS_H)
	add_compile_definitions(HAVE_STRINGS_H)
endif()

check_include_file(sys/select.h HAVE_SYS_SELECT_H)
if(NOT HAVE_SYS_SELECT_H)
	add_compile_definitions(NO_SYS_SELECT_H)
endif()

check_include_file(sys/poll.h HAVE_SYS_POLL_H)
if(NOT HAVE_SYS_POLL_H)
	add_compile_definitions(NO_SYS_POLL_H)
endif()

check_include_file(poll.h HAVE_POLL_H)
if(NOT HAVE_POLL_H)
	add_compile_definitions(NO_POLL_H)
endif()

check_include_file(inttypes.h HAVE_INTTYPES_H)
if(NOT HAVE_INTTYPES_H)
	add_compile_definitions(NO_INTTYPES_H)
endif()

check_include_file(paths.h HAVE_PATHS_H)
if(HAVE_PATHS_H)
	add_compile_definitions(HAVE_PATHS_H)
endif()

#function checks
set(function_checks
	strcasestr memmem strlcpy strtoimax strtoumax strtoull
	setenv mkdtemp poll pread memmem)

#unsetenv,hstrerror are incompatible with windows build
if(NOT WIN32)
	list(APPEND function_checks unsetenv hstrerror)
endif()

foreach(f ${function_checks})
	string(TOUPPER ${f} uf)
	check_function_exists(${f} HAVE_${uf})
	if(NOT HAVE_${uf})
		add_compile_definitions(NO_${uf})
	endif()
endforeach()

if(NOT HAVE_POLL_H OR NOT HAVE_SYS_POLL_H OR NOT HAVE_POLL)
	include_directories(${CMAKE_SOURCE_DIR}/compat/poll)
	add_compile_definitions(NO_POLL)
	list(APPEND compat_SOURCES compat/poll/poll.c)
endif()

if(NOT HAVE_STRCASESTR)
	list(APPEND compat_SOURCES compat/strcasestr.c)
endif()

if(NOT HAVE_STRLCPY)
	list(APPEND compat_SOURCES compat/strlcpy.c)
endif()

if(NOT HAVE_STRTOUMAX)
	list(APPEND compat_SOURCES compat/strtoumax.c compat/strtoimax.c)
endif()

if(NOT HAVE_SETENV)
	list(APPEND compat_SOURCES compat/setenv.c)
endif()

if(NOT HAVE_MKDTEMP)
	list(APPEND compat_SOURCES compat/mkdtemp.c)
endif()

if(NOT HAVE_PREAD)
	list(APPEND compat_SOURCES compat/pread.c)
endif()

if(NOT HAVE_MEMMEM)
	list(APPEND compat_SOURCES compat/memmem.c)
endif()

if(NOT WIN32)
	if(NOT HAVE_UNSETENV)
		list(APPEND compat_SOURCES compat/unsetenv.c)
	endif()

	if(NOT HAVE_HSTRERROR)
		list(APPEND compat_SOURCES compat/hstrerror.c)
	endif()
endif()

check_function_exists(getdelim HAVE_GETDELIM)
if(HAVE_GETDELIM)
	add_compile_definitions(HAVE_GETDELIM)
endif()

check_function_exists(clock_gettime HAVE_CLOCK_GETTIME)
check_symbol_exists(CLOCK_MONOTONIC "time.h" HAVE_CLOCK_MONOTONIC)
if(HAVE_CLOCK_GETTIME)
	add_compile_definitions(HAVE_CLOCK_GETTIME)
endif()
if(HAVE_CLOCK_MONOTONIC)
	add_compile_definitions(HAVE_CLOCK_MONOTONIC)
endif()

#check for st_blocks in struct stat
check_struct_has_member("struct stat" st_blocks "sys/stat.h" STRUCT_STAT_HAS_ST_BLOCKS)
if(NOT STRUCT_STAT_HAS_ST_BLOCKS)
	add_compile_definitions(NO_ST_BLOCKS_IN_STRUCT_STAT)
endif()

#compile checks
check_c_source_runs("
#include<stdio.h>
#include<stdarg.h>
#include<string.h>
#include<stdlib.h>

int test_vsnprintf(char *str, size_t maxsize, const char *format, ...)
{
	int ret;
	va_list ap;

	va_start(ap, format);
	ret = vsnprintf(str, maxsize, format, ap);
	va_end(ap);
	return ret;
}

int main(void)
{
	char buf[6];

	if (test_vsnprintf(buf, 3, \"%s\", \"12345\") != 5
		|| strcmp(buf, \"12\"))
			return 1;
	if (snprintf(buf, 3, \"%s\", \"12345\") != 5
		|| strcmp(buf, \"12\"))
			return 1;
	return 0;
}"
SNPRINTF_OK)
if(NOT SNPRINTF_OK)
	add_compile_definitions(SNPRINTF_RETURNS_BOGUS)
	list(APPEND compat_SOURCES compat/snprintf.c)
endif()

check_c_source_runs("
#include<stdio.h>

int main(void)
{
	FILE *f = fopen(\".\", \"r\");

	return f != NULL;
}"
FREAD_READS_DIRECTORIES_NO)
if(NOT FREAD_READS_DIRECTORIES_NO)
	add_compile_definitions(FREAD_READS_DIRECTORIES)
	list(APPEND compat_SOURCES compat/fopen.c)
endif()

check_c_source_compiles("
#include <regex.h>
#ifndef REG_STARTEND
#error oops we dont have it
#endif

int main(void)
{
	return 0;
}"
HAVE_REGEX)
if(NOT HAVE_REGEX)
	include_directories(${CMAKE_SOURCE_DIR}/compat/regex)
	list(APPEND compat_SOURCES compat/regex/regex.c )
	add_compile_definitions(NO_REGEX NO_MBSUPPORT GAWK)
endif()


check_c_source_compiles("
#include <stddef.h>
#include <sys/types.h>
#include <sys/sysctl.h>

int main(void)
{
	int val, mib[2];
	size_t len;

	mib[0] = CTL_HW;
	mib[1] = 1;
	len = sizeof(val);
	return sysctl(mib, 2, &val, &len, NULL, 0) ? 1 : 0;
}"
HAVE_BSD_SYSCTL)
if(HAVE_BSD_SYSCTL)
	add_compile_definitions(HAVE_BSD_SYSCTL)
endif()

set(CMAKE_REQUIRED_LIBRARIES ${Iconv_LIBRARIES})
set(CMAKE_REQUIRED_INCLUDES ${Iconv_INCLUDE_DIRS})

check_c_source_compiles("
#include <iconv.h>

extern size_t iconv(iconv_t cd,
		char **inbuf, size_t *inbytesleft,
		char **outbuf, size_t *outbytesleft);

int main(void)
{
	return 0;
}"
HAVE_NEW_ICONV)
if(HAVE_NEW_ICONV)
	set(HAVE_OLD_ICONV 0)
else()
	set(HAVE_OLD_ICONV 1)
endif()

check_c_source_runs("
#include <iconv.h>
#if ${HAVE_OLD_ICONV}
typedef const char *iconv_ibp;
#else
typedef char *iconv_ibp;
#endif

int main(void)
{
	int v;
	iconv_t conv;
	char in[] = \"a\";
	iconv_ibp pin = in;
	char out[20] = \"\";
	char *pout = out;
	size_t isz = sizeof(in);
	size_t osz = sizeof(out);

	conv = iconv_open(\"UTF-16\", \"UTF-8\");
	iconv(conv, &pin, &isz, &pout, &osz);
	iconv_close(conv);
	v = (unsigned char)(out[0]) + (unsigned char)(out[1]);
	return v != 0xfe + 0xff;
}"
ICONV_DOESNOT_OMIT_BOM)
if(NOT ICONV_DOESNOT_OMIT_BOM)
	add_compile_definitions(ICONV_OMITS_BOM)
endif()

unset(CMAKE_REQUIRED_LIBRARIES)
unset(CMAKE_REQUIRED_INCLUDES)


#programs
set(PROGRAMS_BUILT
	git git-daemon git-http-backend git-sh-i18n--envsubst
	git-shell)

if(NOT CURL_FOUND)
	list(APPEND excluded_progs git-http-fetch git-http-push)
	add_compile_definitions(NO_CURL)
	message(WARNING "git-http-push and git-http-fetch will not be built")
else()
	list(APPEND PROGRAMS_BUILT git-http-fetch git-http-push git-imap-send git-remote-http)
	if(CURL_VERSION_STRING VERSION_GREATER_EQUAL 7.34.0)
		add_compile_definitions(USE_CURL_FOR_IMAP_SEND)
	endif()
endif()

if(NOT EXPAT_FOUND)
	list(APPEND excluded_progs git-http-push)
	add_compile_definitions(NO_EXPAT)
else()
	list(APPEND PROGRAMS_BUILT git-http-push)
	if(EXPAT_VERSION_STRING VERSION_LESS_EQUAL 1.2)
		add_compile_definitions(EXPAT_NEEDS_XMLPARSE_H)
	endif()
endif()

list(REMOVE_DUPLICATES excluded_progs)
list(REMOVE_DUPLICATES PROGRAMS_BUILT)


foreach(p ${excluded_progs})
	list(APPEND EXCLUSION_PROGS --exclude-program ${p} )
endforeach()

#for comparing null values
list(APPEND EXCLUSION_PROGS empty)
set(EXCLUSION_PROGS_CACHE ${EXCLUSION_PROGS} CACHE STRING "Programs not built" FORCE)

if(NOT EXISTS ${CMAKE_BINARY_DIR}/command-list.h OR NOT EXCLUSION_PROGS_CACHE STREQUAL EXCLUSION_PROGS)
	list(REMOVE_ITEM EXCLUSION_PROGS empty)
	message("Generating command-list.h")
	execute_process(COMMAND ${SH_EXE} ${CMAKE_SOURCE_DIR}/generate-cmdlist.sh ${EXCLUSION_PROGS} command-list.txt
			WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
			OUTPUT_FILE ${CMAKE_BINARY_DIR}/command-list.h)
endif()

if(NOT EXISTS ${CMAKE_BINARY_DIR}/config-list.h)
	message("Generating config-list.h")
	execute_process(COMMAND ${SH_EXE} ${CMAKE_SOURCE_DIR}/generate-configlist.sh
			WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
			OUTPUT_FILE ${CMAKE_BINARY_DIR}/config-list.h)
endif()

include_directories(${CMAKE_BINARY_DIR})

#build
#libgit
parse_makefile_for_sources(libgit_SOURCES "LIB_OBJS")

list(TRANSFORM libgit_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
list(TRANSFORM compat_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
add_library(libgit ${libgit_SOURCES} ${compat_SOURCES})

#libxdiff
parse_makefile_for_sources(libxdiff_SOURCES "XDIFF_OBJS")

list(TRANSFORM libxdiff_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
add_library(xdiff STATIC ${libxdiff_SOURCES})

if(WIN32)
	if(NOT MSVC)#use windres when compiling with gcc and clang
		add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/git.res
				COMMAND ${WINDRES_EXE} -O coff -DMAJOR=${PROJECT_VERSION_MAJOR} -DMINOR=${PROJECT_VERSION_MINOR}
					-DMICRO=${PROJECT_VERSION_PATCH} -DPATCHLEVEL=0 -DGIT_VERSION="\\\"${PROJECT_VERSION}.GIT\\\""
					-i ${CMAKE_SOURCE_DIR}/git.rc -o ${CMAKE_BINARY_DIR}/git.res
				WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
				VERBATIM)
	else()#MSVC use rc
		add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/git.res
				COMMAND ${CMAKE_RC_COMPILER} /d MAJOR=${PROJECT_VERSION_MAJOR} /d MINOR=${PROJECT_VERSION_MINOR}
					/d MICRO=${PROJECT_VERSION_PATCH} /d PATCHLEVEL=0 /d GIT_VERSION="${PROJECT_VERSION}.GIT"
					/fo ${CMAKE_BINARY_DIR}/git.res ${CMAKE_SOURCE_DIR}/git.rc
				WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
				VERBATIM)
	endif()
	add_custom_target(git-rc DEPENDS ${CMAKE_BINARY_DIR}/git.res)
endif()

#link all required libraries to common-main
add_library(common-main OBJECT ${CMAKE_SOURCE_DIR}/common-main.c)

target_link_libraries(common-main libgit xdiff ${ZLIB_LIBRARIES})
if(Intl_FOUND)
	target_link_libraries(common-main ${Intl_LIBRARIES})
endif()
if(Iconv_FOUND)
	target_link_libraries(common-main ${Iconv_LIBRARIES})
endif()
if(WIN32)
	target_link_libraries(common-main ws2_32 ntdll ${CMAKE_BINARY_DIR}/git.res)
	add_dependencies(common-main git-rc)
	if(CMAKE_C_COMPILER_ID STREQUAL "GNU")
		target_link_options(common-main PUBLIC -municode -Wl,--nxcompat -Wl,--dynamicbase -Wl,--pic-executable,-e,mainCRTStartup)
	elseif(CMAKE_C_COMPILER_ID STREQUAL "Clang")
		target_link_options(common-main PUBLIC -municode -Wl,-nxcompat -Wl,-dynamicbase -Wl,-entry:wmainCRTStartup -Wl,invalidcontinue.obj)
	elseif(CMAKE_C_COMPILER_ID STREQUAL "MSVC")
		target_link_options(common-main PUBLIC /IGNORE:4217 /IGNORE:4049 /NOLOGO /ENTRY:wmainCRTStartup /SUBSYSTEM:CONSOLE invalidcontinue.obj)
	endif()
elseif(UNIX)
	target_link_libraries(common-main pthread rt)
endif()

#git
parse_makefile_for_sources(git_SOURCES "BUILTIN_OBJS")

list(TRANSFORM git_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
add_executable(git ${CMAKE_SOURCE_DIR}/git.c ${git_SOURCES})
target_link_libraries(git common-main)

add_executable(git-daemon ${CMAKE_SOURCE_DIR}/daemon.c)
target_link_libraries(git-daemon common-main)

add_executable(git-http-backend ${CMAKE_SOURCE_DIR}/http-backend.c)
target_link_libraries(git-http-backend common-main)

add_executable(git-sh-i18n--envsubst ${CMAKE_SOURCE_DIR}/sh-i18n--envsubst.c)
target_link_libraries(git-sh-i18n--envsubst common-main)

add_executable(git-shell ${CMAKE_SOURCE_DIR}/shell.c)
target_link_libraries(git-shell common-main)

if(CURL_FOUND)
	add_library(http_obj OBJECT ${CMAKE_SOURCE_DIR}/http.c)

	add_executable(git-imap-send ${CMAKE_SOURCE_DIR}/imap-send.c)
	target_link_libraries(git-imap-send http_obj common-main ${CURL_LIBRARIES})

	add_executable(git-http-fetch ${CMAKE_SOURCE_DIR}/http-walker.c ${CMAKE_SOURCE_DIR}/http-fetch.c)
	target_link_libraries(git-http-fetch http_obj common-main ${CURL_LIBRARIES})

	add_executable(git-remote-http ${CMAKE_SOURCE_DIR}/http-walker.c ${CMAKE_SOURCE_DIR}/remote-curl.c)
	target_link_libraries(git-remote-http http_obj common-main ${CURL_LIBRARIES} )

	if(EXPAT_FOUND)
		add_executable(git-http-push ${CMAKE_SOURCE_DIR}/http-push.c)
		target_link_libraries(git-http-push http_obj common-main ${CURL_LIBRARIES} ${EXPAT_LIBRARIES})
	endif()
endif()

set(git_builtin_extra
	cherry cherry-pick format-patch fsck-objects
	init merge-subtree restore show
	stage status switch whatchanged)

#Creating hardlinks
foreach(s ${git_SOURCES} ${git_builtin_extra})
	string(REPLACE "${CMAKE_SOURCE_DIR}/builtin/" "" s ${s})
	string(REPLACE ".c" "" s ${s})
	file(APPEND ${CMAKE_BINARY_DIR}/CreateLinks.cmake "file(CREATE_LINK git${EXE_EXTENSION} git-${s}${EXE_EXTENSION})\n")
	list(APPEND git_links ${CMAKE_BINARY_DIR}/git-${s}${EXE_EXTENSION})
endforeach()

if(CURL_FOUND)
	set(remote_exes
		git-remote-https git-remote-ftp git-remote-ftps)
	foreach(s ${remote_exes})
		file(APPEND ${CMAKE_BINARY_DIR}/CreateLinks.cmake "file(CREATE_LINK git-remote-http${EXE_EXTENSION} ${s}${EXE_EXTENSION})\n")
		list(APPEND git_http_links ${CMAKE_BINARY_DIR}/${s}${EXE_EXTENSION})
	endforeach()
endif()

add_custom_command(OUTPUT ${git_links} ${git_http_links}
		COMMAND ${CMAKE_COMMAND} -P ${CMAKE_BINARY_DIR}/CreateLinks.cmake
		DEPENDS git git-remote-http)
add_custom_target(git-links ALL DEPENDS ${git_links} ${git_http_links})


#creating required scripts
set(SHELL_PATH /bin/sh)
set(PERL_PATH /usr/bin/perl)
set(LOCALEDIR ${FALLBACK_RUNTIME_PREFIX}/share/locale)
set(GITWEBDIR ${FALLBACK_RUNTIME_PREFIX}/share/locale)
set(INSTLIBDIR ${FALLBACK_RUNTIME_PREFIX}/share/perl5)

#shell scripts
parse_makefile_for_scripts(git_sh_scripts "SCRIPT_SH" ".sh")
parse_makefile_for_scripts(git_shlib_scripts "SCRIPT_LIB" "")
set(git_shell_scripts
	${git_sh_scripts} ${git_shlib_scripts} git-instaweb)

foreach(script ${git_shell_scripts})
	file(STRINGS ${CMAKE_SOURCE_DIR}/${script}.sh content NEWLINE_CONSUME)
	string(REPLACE "@SHELL_PATH@" "${SHELL_PATH}" content "${content}")
	string(REPLACE "@@DIFF@@" "diff" content "${content}")
	string(REPLACE "@LOCALEDIR@" "${LOCALEDIR}" content "${content}")
	string(REPLACE "@GITWEBDIR@" "${GITWEBDIR}" content "${content}")
	string(REPLACE "@@NO_CURL@@" "" content "${content}")
	string(REPLACE "@@USE_GETTEXT_SCHEME@@" "" content "${content}")
	string(REPLACE "# @@BROKEN_PATH_FIX@@" "" content "${content}")
	string(REPLACE "@@PERL@@" "${PERL_PATH}" content "${content}")
	string(REPLACE "@@SANE_TEXT_GREP@@" "-a" content "${content}")
	string(REPLACE "@@PAGER_ENV@@" "LESS=FRX LV=-c" content "${content}")
	file(WRITE ${CMAKE_BINARY_DIR}/${script} ${content})
endforeach()

#perl scripts
parse_makefile_for_scripts(git_perl_scripts "SCRIPT_PERL" ".perl")

#create perl header
file(STRINGS ${CMAKE_SOURCE_DIR}/perl/header_templates/fixed_prefix.template.pl perl_header )
string(REPLACE "@@PATHSEP@@" ":" perl_header "${perl_header}")
string(REPLACE "@@INSTLIBDIR@@" "${INSTLIBDIR}" perl_header "${perl_header}")

foreach(script ${git_perl_scripts})
	file(STRINGS ${CMAKE_SOURCE_DIR}/${script}.perl content NEWLINE_CONSUME)
	string(REPLACE "#!/usr/bin/perl" "#!/usr/bin/perl\n${perl_header}\n" content "${content}")
	string(REPLACE "@@GIT_VERSION@@" "${PROJECT_VERSION}" content "${content}")
	file(WRITE ${CMAKE_BINARY_DIR}/${script} ${content})
endforeach()

#python script
file(STRINGS ${CMAKE_SOURCE_DIR}/git-p4.py content NEWLINE_CONSUME)
string(REPLACE "#!/usr/bin/env python" "#!/usr/bin/python" content "${content}")
file(WRITE ${CMAKE_BINARY_DIR}/git-p4 ${content})

#perl modules
file(GLOB_RECURSE perl_modules "${CMAKE_SOURCE_DIR}/perl/*.pm")

foreach(pm ${perl_modules})
	string(REPLACE "${CMAKE_SOURCE_DIR}/perl/" "" file_path ${pm})
	file(STRINGS ${pm} content NEWLINE_CONSUME)
	string(REPLACE "@@LOCALEDIR@@" "${LOCALEDIR}" content "${content}")
	string(REPLACE "@@NO_PERL_CPAN_FALLBACKS@@" "" content "${content}")
	file(WRITE ${CMAKE_BINARY_DIR}/perl/build/lib/${file_path} ${content})
#test-lib.sh requires perl/build/lib to be the build directory of perl modules
endforeach()


#templates
file(GLOB templates "${CMAKE_SOURCE_DIR}/templates/*")
list(TRANSFORM templates REPLACE "${CMAKE_SOURCE_DIR}/templates/" "")
list(REMOVE_ITEM templates ".gitignore")
list(REMOVE_ITEM templates "Makefile")
list(REMOVE_ITEM templates "blt")# Prevents an error when reconfiguring for in source builds

list(REMOVE_ITEM templates "branches--")
file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/templates/blt/branches) #create branches

#templates have @.*@ replacement so use configure_file instead
foreach(tm ${templates})
	string(REPLACE "--" "/" blt_tm ${tm})
	string(REPLACE "this" "" blt_tm ${blt_tm})# for this--
	configure_file(${CMAKE_SOURCE_DIR}/templates/${tm} ${CMAKE_BINARY_DIR}/templates/blt/${blt_tm} @ONLY)
endforeach()


#translations
if(MSGFMT_EXE)
	file(GLOB po_files "${CMAKE_SOURCE_DIR}/po/*.po")
	list(TRANSFORM po_files REPLACE "${CMAKE_SOURCE_DIR}/po/" "")
	list(TRANSFORM po_files REPLACE ".po" "")
	foreach(po ${po_files})
		file(MAKE_DIRECTORY ${CMAKE_BINARY_DIR}/po/build/locale/${po}/LC_MESSAGES)
		add_custom_command(OUTPUT ${CMAKE_BINARY_DIR}/po/build/locale/${po}/LC_MESSAGES/git.mo
				COMMAND ${MSGFMT_EXE} --check --statistics -o ${CMAKE_BINARY_DIR}/po/build/locale/${po}/LC_MESSAGES/git.mo ${CMAKE_SOURCE_DIR}/po/${po}.po)
		list(APPEND po_gen ${CMAKE_BINARY_DIR}/po/build/locale/${po}/LC_MESSAGES/git.mo)
	endforeach()
	add_custom_target(po-gen ALL DEPENDS ${po_gen})
endif()


#to help with the install
list(TRANSFORM git_shell_scripts PREPEND "${CMAKE_BINARY_DIR}/")
list(TRANSFORM git_perl_scripts PREPEND "${CMAKE_BINARY_DIR}/")

#install
install(TARGETS git git-shell
	RUNTIME DESTINATION bin)
install(PROGRAMS ${CMAKE_BINARY_DIR}/git-cvsserver
	DESTINATION bin)

list(REMOVE_ITEM PROGRAMS_BUILT git git-shell)
install(TARGETS ${PROGRAMS_BUILT}
	RUNTIME DESTINATION libexec/git-core)

set(bin_links
	git-receive-pack git-upload-archive git-upload-pack)

foreach(b ${bin_links})
install(CODE "file(CREATE_LINK ${CMAKE_INSTALL_PREFIX}/bin/git${EXE_EXTENSION} ${CMAKE_INSTALL_PREFIX}/bin/${b}${EXE_EXTENSION})")
endforeach()

install(CODE "file(CREATE_LINK ${CMAKE_INSTALL_PREFIX}/bin/git${EXE_EXTENSION} ${CMAKE_INSTALL_PREFIX}/libexec/git-core/git${EXE_EXTENSION})")
install(CODE "file(CREATE_LINK ${CMAKE_INSTALL_PREFIX}/bin/git-shell${EXE_EXTENSION} ${CMAKE_INSTALL_PREFIX}/libexec/git-core/git-shell${EXE_EXTENSION})")

foreach(b ${git_links})
	string(REPLACE "${CMAKE_BINARY_DIR}" "" b ${b})
	install(CODE "file(CREATE_LINK ${CMAKE_INSTALL_PREFIX}/bin/git${EXE_EXTENSION} ${CMAKE_INSTALL_PREFIX}/libexec/git-core/${b}${EXE_EXTENSION})")
endforeach()

foreach(b ${git_http_links})
	string(REPLACE "${CMAKE_BINARY_DIR}" "" b ${b})
	install(CODE "file(CREATE_LINK  ${CMAKE_INSTALL_PREFIX}/libexec/git-core/git-remote-http${EXE_EXTENSION} ${CMAKE_INSTALL_PREFIX}/libexec/git-core/${b}${EXE_EXTENSION})")
endforeach()

install(PROGRAMS ${git_shell_scripts} ${git_perl_scripts} ${CMAKE_BINARY_DIR}/git-p4
	DESTINATION libexec/git-core)

install(DIRECTORY ${CMAKE_SOURCE_DIR}/mergetools DESTINATION libexec/git-core)
install(DIRECTORY ${CMAKE_BINARY_DIR}/perl/build/lib/ DESTINATION share/perl5
	FILES_MATCHING PATTERN "*.pm")
install(DIRECTORY ${CMAKE_BINARY_DIR}/templates/blt/ DESTINATION share/git-core/templates)

if(MSGFMT_EXE)
	install(DIRECTORY ${CMAKE_BINARY_DIR}/po/build/locale DESTINATION share)
endif()


if(BUILD_TESTING)

#tests-helpers
add_executable(test-fake-ssh ${CMAKE_SOURCE_DIR}/t/helper/test-fake-ssh.c)
target_link_libraries(test-fake-ssh common-main)

#test-tool
parse_makefile_for_sources(test-tool_SOURCES "TEST_BUILTINS_OBJS")

list(TRANSFORM test-tool_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/t/helper/")
add_executable(test-tool ${CMAKE_SOURCE_DIR}/t/helper/test-tool.c ${test-tool_SOURCES})
target_link_libraries(test-tool common-main)

set_target_properties(test-fake-ssh test-tool
			PROPERTIES RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/t/helper)

if(MSVC)
	set_target_properties(test-fake-ssh test-tool
				PROPERTIES RUNTIME_OUTPUT_DIRECTORY_DEBUG ${CMAKE_BINARY_DIR}/t/helper)
	set_target_properties(test-fake-ssh test-tool
				PROPERTIES RUNTIME_OUTPUT_DIRECTORY_RELEASE ${CMAKE_BINARY_DIR}/t/helper)
endif()

#wrapper scripts
set(wrapper_scripts
	git git-upload-pack git-receive-pack git-upload-archive git-shell git-remote-ext)

set(wrapper_test_scripts
	test-fake-ssh test-tool)


foreach(script ${wrapper_scripts})
	file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
	string(REPLACE "@@BUILD_DIR@@" "${CMAKE_BINARY_DIR}" content "${content}")
	string(REPLACE "@@PROG@@" "${script}${EXE_EXTENSION}" content "${content}")
	file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/${script} ${content})
endforeach()

foreach(script ${wrapper_test_scripts})
	file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
	string(REPLACE "@@BUILD_DIR@@" "${CMAKE_BINARY_DIR}" content "${content}")
	string(REPLACE "@@PROG@@" "t/helper/${script}${EXE_EXTENSION}" content "${content}")
	file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/${script} ${content})
endforeach()

file(STRINGS ${CMAKE_SOURCE_DIR}/wrap-for-bin.sh content NEWLINE_CONSUME)
string(REPLACE "@@BUILD_DIR@@" "${CMAKE_BINARY_DIR}" content "${content}")
string(REPLACE "@@PROG@@" "git-cvsserver" content "${content}")
file(WRITE ${CMAKE_BINARY_DIR}/bin-wrappers/git-cvsserver ${content})

#options for configuring test options
option(PERL_TESTS "Perform tests that use perl" ON)
option(PYTHON_TESTS "Perform tests that use python" ON)

#GIT-BUILD-OPTIONS
set(TEST_SHELL_PATH ${SHELL_PATH})
set(DIFF diff)
set(PYTHON_PATH /usr/bin/python)
set(TAR tar)
set(NO_CURL )
set(NO_EXPAT )
set(USE_LIBPCRE1 )
set(USE_LIBPCRE2 )
set(NO_LIBPCRE1_JIT )
set(NO_PERL )
set(NO_PTHREADS )
set(NO_PYTHON )
set(PAGER_ENV "LESS=FRX LV=-c")
set(DC_SHA1 YesPlease)
set(RUNTIME_PREFIX true)
set(NO_GETTEXT )

if(NOT CURL_FOUND)
	set(NO_CURL 1)
endif()

if(NOT EXPAT_FOUND)
	set(NO_EXPAT 1)
endif()

if(NOT Intl_FOUND)
	set(NO_GETTEXT 1)
endif()

if(NOT PERL_TESTS)
	set(NO_PERL 1)
endif()

if(NOT PYTHON_TESTS)
	set(NO_PYTHON 1)
endif()

file(WRITE ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "SHELL_PATH='${SHELL_PATH}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "TEST_SHELL_PATH='${TEST_SHELL_PATH}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "PERL_PATH='${PERL_PATH}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "DIFF='${DIFF}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "PYTHON_PATH='${PYTHON_PATH}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "TAR='${TAR}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_CURL='${NO_CURL}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_EXPAT='${NO_EXPAT}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "USE_LIBPCRE1='${USE_LIBPCRE1}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_LIBPCRE1_JIT='${NO_LIBPCRE1_JIT}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_PERL='${NO_PERL}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_PTHREADS='${NO_PTHREADS}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_UNIX_SOCKETS='${NO_UNIX_SOCKETS}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "PAGER_ENV='${PAGER_ENV}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "DC_SHA1='${DC_SHA1}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "X='${EXE_EXTENSION}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_GETTEXT='${NO_GETTEXT}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "RUNTIME_PREFIX='${RUNTIME_PREFIX}'\n")
file(APPEND ${CMAKE_BINARY_DIR}/GIT-BUILD-OPTIONS "NO_PYTHON='${NO_PYTHON}'\n")

#Make the tests work when building out of the source tree
get_filename_component(CACHE_PATH ${CMAKE_CURRENT_LIST_DIR}/../../CMakeCache.txt ABSOLUTE)
if(NOT ${CMAKE_BINARY_DIR}/CMakeCache.txt STREQUAL ${CACHE_PATH})
	file(RELATIVE_PATH BUILD_DIR_RELATIVE ${CMAKE_SOURCE_DIR} ${CMAKE_BINARY_DIR}/CMakeCache.txt)
	string(REPLACE "/CMakeCache.txt" "" BUILD_DIR_RELATIVE ${BUILD_DIR_RELATIVE})
	#Setting the build directory in test-lib.sh before running tests
	file(WRITE ${CMAKE_BINARY_DIR}/CTestCustom.cmake
		"file(STRINGS ${CMAKE_SOURCE_DIR}/t/test-lib.sh GIT_BUILD_DIR_REPL REGEX \"GIT_BUILD_DIR=(.*)\")\n"
		"file(STRINGS ${CMAKE_SOURCE_DIR}/t/test-lib.sh content NEWLINE_CONSUME)\n"
		"string(REPLACE \"\${GIT_BUILD_DIR_REPL}\" \"GIT_BUILD_DIR=\\\"$TEST_DIRECTORY\\\"/../${BUILD_DIR_RELATIVE}\" content \"\${content}\")\n"
		"file(WRITE ${CMAKE_SOURCE_DIR}/t/test-lib.sh \${content})")
	#misc copies
	file(COPY ${CMAKE_SOURCE_DIR}/t/chainlint.sed DESTINATION ${CMAKE_BINARY_DIR}/t/)
	file(COPY ${CMAKE_SOURCE_DIR}/po/is.po DESTINATION ${CMAKE_BINARY_DIR}/po/)
	file(COPY ${CMAKE_SOURCE_DIR}/mergetools/tkdiff DESTINATION ${CMAKE_BINARY_DIR}/mergetools/)
	file(COPY ${CMAKE_SOURCE_DIR}/contrib/completion/git-prompt.sh DESTINATION ${CMAKE_BINARY_DIR}/contrib/completion/)
	file(COPY ${CMAKE_SOURCE_DIR}/contrib/completion/git-completion.bash DESTINATION ${CMAKE_BINARY_DIR}/contrib/completion/)
endif()

file(GLOB test_scipts "${CMAKE_SOURCE_DIR}/t/t[0-9]*.sh")

#test
foreach(tsh ${test_scipts})
	add_test(NAME ${tsh}
		COMMAND ${SH_EXE} ${tsh}
		WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/t)
endforeach()

endif()#BUILD_TESTING