path: root/contrib/buildsystems/CMakeLists.txt

#
#	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)

#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)


#macros for parsing the Makefile for sources
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()

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

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

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()

#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="")

set(FALLBACK_RUNTIME_PREFIX /home/$ENV{USER})
add_compile_definitions(FALLBACK_RUNTIME_PREFIX="${FALLBACK_RUNTIME_PREFIX}")

add_compile_definitions(PROCFS_EXECUTABLE_PATH="/proc/self/exe" HAVE_DEV_TTY )
list(APPEND compat_SOURCES unix-socket.c)

#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)

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-bugreport git-credential-store git-daemon git-fast-import git-http-backend git-sh-i18n--envsubst
	git-shell git-remote-testsvn git-credential-cache git-credential-cache--daemon)

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})

#libvcs-svn
parse_makefile_for_sources(libvcs-svn_SOURCES "VCSSVN_OBJS")

list(TRANSFORM libvcs-svn_SOURCES PREPEND "${CMAKE_SOURCE_DIR}/")
add_library(vcs-svn STATIC ${libvcs-svn_SOURCES})

#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} pthread rt)
if(Intl_FOUND)
	target_link_libraries(common-main ${Intl_LIBRARIES})
endif()
if(Iconv_FOUND)
	target_link_libraries(common-main ${Iconv_LIBRARIES})
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-bugreport ${CMAKE_SOURCE_DIR}/bugreport.c)
target_link_libraries(git-bugreport common-main)

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

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

add_executable(git-fast-import ${CMAKE_SOURCE_DIR}/fast-import.c)
target_link_libraries(git-fast-import 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()

add_executable(git-remote-testsvn ${CMAKE_SOURCE_DIR}/remote-testsvn.c)
target_link_libraries(git-remote-testsvn common-main vcs-svn)

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

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


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 ${CMAKE_BINARY_DIR}/CreateLinks.cmake "file(CREATE_LINK git git-${s})\n")
	list(APPEND git_links ${CMAKE_BINARY_DIR}/git-${s})
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 ${s})\n")
		list(APPEND git_http_links ${CMAKE_BINARY_DIR}/${s})
	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})