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# CMake build script for the libgit2 project
# See `README.md` for build instructions.
cmake_minimum_required(VERSION 3.5.1)
project(libgit2 VERSION "1.3.0" LANGUAGES C)
# Add find modules to the path
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${libgit2_SOURCE_DIR}/cmake")
# Modules
include(CheckLibraryExists)
include(CheckFunctionExists)
include(CheckSymbolExists)
include(CheckStructHasMember)
include(CheckPrototypeDefinition)
include(AddCFlagIfSupported)
include(FindPkgLibraries)
include(FindThreads)
include(FindStatNsec)
include(Findfutimens)
include(GNUInstallDirs)
include(IdeSplitSources)
include(FeatureSummary)
include(EnableWarnings)
#
# Build options
#
# Optional subsystems
option(BUILD_SHARED_LIBS "Build Shared Library (OFF for Static)" ON)
option(BUILD_TESTS "Build Tests using the Clar suite" ON)
option(BUILD_EXAMPLES "Build library usage example apps" OFF)
option(BUILD_FUZZERS "Build the fuzz targets" OFF)
# Suggested functionality that may not be available on a per-platform basis
option(USE_THREADS "Use threads for parallel processing when possible" ON)
option(USE_NSEC "Support nanosecond precision file mtimes and ctimes" ON)
# Backend selection
option(USE_SSH "Link with libssh2 to enable SSH support" ON)
option(USE_HTTPS "Enable HTTPS support. Can be set to a specific backend" ON)
option(USE_SHA1 "Enable SHA1. Can be set to CollisionDetection(ON)/HTTPS/Generic" ON)
option(USE_GSSAPI "Link with libgssapi for SPNEGO auth" OFF)
set(USE_HTTP_PARSER "" CACHE STRING "Specifies the HTTP Parser implementation; either system or builtin.")
set(REGEX_BACKEND "" CACHE STRING "Regular expression implementation. One of regcomp_l, pcre2, pcre, regcomp, or builtin.")
option(USE_BUNDLED_ZLIB "Use the bundled version of zlib. Can be set to one of Bundled(ON)/Chromium. The Chromium option requires a x86_64 processor with SSE4.2 and CLMUL" OFF)
# Debugging options
option(USE_LEAK_CHECKER "Run tests with leak checker" OFF)
option(USE_STANDALONE_FUZZERS "Enable standalone fuzzers (compatible with gcc)" OFF)
option(DEBUG_POOL "Enable debug pool allocator" OFF)
option(DEBUG_STRICT_ALLOC "Enable strict allocator behavior" OFF)
option(DEBUG_STRICT_OPEN "Enable path validation in open" OFF)
# Output options
option(SONAME "Set the (SO)VERSION of the target" ON)
option(LIBGIT2_FILENAME "Name of the produced binary" OFF)
option(DEPRECATE_HARD "Do not include deprecated functions in the library" OFF)
# Compilation options
option(ENABLE_WERROR "Enable compilation with -Werror" OFF)
if(UNIX)
# NTLM client requires crypto libraries from the system HTTPS stack
if(NOT USE_HTTPS)
option(USE_NTLMCLIENT "Enable NTLM support on Unix." OFF)
else()
option(USE_NTLMCLIENT "Enable NTLM support on Unix." ON)
endif()
option(ENABLE_REPRODUCIBLE_BUILDS "Enable reproducible builds" OFF)
endif()
if(APPLE)
option(USE_ICONV "Link with and use iconv library" ON)
endif()
if(MSVC)
# 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)
# If you want to embed a copy of libssh2 into libgit2, pass a
# path to libssh2
option(EMBED_SSH_PATH "Path to libssh2 to embed (Windows)" OFF)
# Enable leak checking using the debugging C runtime.
option(WIN32_LEAKCHECK "Enable leak reporting via crtdbg" OFF)
endif()
if(WIN32)
# By default, libgit2 is built with WinHTTP. To use the built-in
# HTTP transport, invoke CMake with the "-DUSE_WINHTTP=OFF" argument.
option(USE_WINHTTP "Use Win32 WinHTTP routines" ON)
endif()
#
# Compiler / linker flags
#
if(DEPRECATE_HARD)
add_definitions(-DGIT_DEPRECATE_HARD)
endif()
# Platform specific compilation flags
if(MSVC)
add_definitions(-D_SCL_SECURE_NO_WARNINGS)
add_definitions(-D_CRT_SECURE_NO_DEPRECATE)
add_definitions(-D_CRT_NONSTDC_NO_DEPRECATE)
string(REPLACE "/Zm1000" " " CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
# /GF - String pooling
# /MP - Parallel build
set(CMAKE_C_FLAGS "/GF /MP /nologo ${CMAKE_C_FLAGS}")
# /Gd - explicitly set cdecl calling convention
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /Gd")
if(NOT (MSVC_VERSION LESS 1900))
# /guard:cf - Enable Control Flow Guard
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /guard:cf")
endif()
if(STATIC_CRT)
set(CRT_FLAG_DEBUG "/MTd")
set(CRT_FLAG_RELEASE "/MT")
else()
set(CRT_FLAG_DEBUG "/MDd")
set(CRT_FLAG_RELEASE "/MD")
endif()
if(WIN32_LEAKCHECK)
set(GIT_WIN32_LEAKCHECK 1)
set(CRT_FLAG_DEBUG "${CRT_FLAG_DEBUG}")
set(CMAKE_C_STANDARD_LIBRARIES "${CMAKE_C_STANDARD_LIBRARIES} Dbghelp.lib")
endif()
# /Zi - Create debugging information
# /Od - Disable optimization
# /D_DEBUG - #define _DEBUG
# /MTd - Statically link the multithreaded debug version of the CRT
# /MDd - Dynamically link the multithreaded debug version of the CRT
# /RTC1 - Run time checks
set(CMAKE_C_FLAGS_DEBUG "${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 ${CRT_FLAG_RELEASE}")
# /IGNORE:4221 - Ignore empty compilation units
set(CMAKE_STATIC_LINKER_FLAGS "/IGNORE:4221")
# /DYNAMICBASE - Address space load randomization (ASLR)
# /NXCOMPAT - Data execution prevention (DEP)
# /LARGEADDRESSAWARE - >2GB user address space on x86
# /VERSION - Embed version information in PE header
set(CMAKE_EXE_LINKER_FLAGS "/DYNAMICBASE /NXCOMPAT /LARGEADDRESSAWARE /VERSION:${libgit2_VERSION_MAJOR}.${libgit2_VERSION_MINOR}")
if(NOT (MSVC_VERSION LESS 1900))
# /GUARD:CF - Enable Control Flow Guard
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /GUARD:CF")
endif()
# /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}")
else()
if(ENABLE_REPRODUCIBLE_BUILDS)
set(CMAKE_C_ARCHIVE_CREATE "<CMAKE_AR> Dqc <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_APPEND "<CMAKE_AR> Dq <TARGET> <LINK_FLAGS> <OBJECTS>")
set(CMAKE_C_ARCHIVE_FINISH "<CMAKE_RANLIB> -D <TARGET>")
endif()
if(NOT BUILD_SHARED_LIBS)
set(CMAKE_FIND_LIBRARY_SUFFIXES ".a")
endif()
set(CMAKE_C_FLAGS "-D_GNU_SOURCE ${CMAKE_C_FLAGS}")
enable_warnings(all)
enable_warnings(extra)
if(CMAKE_SYSTEM_NAME MATCHES "(Solaris|SunOS)")
set(CMAKE_C_FLAGS "-D_POSIX_C_SOURCE=200112L -D__EXTENSIONS__ -D_POSIX_PTHREAD_SEMANTICS ${CMAKE_C_FLAGS}")
endif()
set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -D_DEBUG -O0")
if(MINGW OR MSYS) # MinGW and MSYS always do PIC and complain if we tell them to
string(REGEX REPLACE "-fPIC" "" CMAKE_SHARED_LIBRARY_C_FLAGS "${CMAKE_SHARED_LIBRARY_C_FLAGS}")
elseif(BUILD_SHARED_LIBS)
add_c_flag_IF_SUPPORTED(-fvisibility=hidden)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fPIC")
endif()
if(MINGW)
# 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)
endif()
enable_warnings(documentation)
disable_warnings(documentation-deprecated-sync)
disable_warnings(missing-field-initializers)
enable_warnings(strict-aliasing)
enable_warnings(strict-prototypes)
enable_warnings(declaration-after-statement)
enable_warnings(shift-count-overflow)
enable_warnings(unused-const-variable)
enable_warnings(unused-function)
enable_warnings(int-conversion)
enable_warnings(c11-extensions)
enable_warnings(c99-c11-compat)
# MinGW uses gcc, which expects POSIX formatting for printf, but
# uses the Windows C library, which uses its own format specifiers.
# Disable format specifier warnings.
if(MINGW)
disable_warnings(format)
disable_warnings(format-security)
else()
enable_warnings(format)
enable_warnings(format-security)
endif()
endif()
# Ensure that MinGW provides the correct header files.
if(WIN32 AND NOT CYGWIN)
add_definitions(-DWIN32 -D_WIN32_WINNT=0x0600)
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(BUILD_FUZZERS AND NOT USE_STANDALONE_FUZZERS)
# The actual sanitizer link target will be added when linking the fuzz
# targets.
set(CMAKE_REQUIRED_FLAGS "-fsanitize=fuzzer-no-link")
add_c_flag(-fsanitize=fuzzer-no-link)
unset(CMAKE_REQUIRED_FLAGS)
endif()
#
# Subdirectories
#
add_subdirectory(src)
if(BUILD_TESTS)
enable_testing()
add_subdirectory(tests)
endif()
if(BUILD_EXAMPLES)
add_subdirectory(examples)
endif()
if(BUILD_FUZZERS)
if(NOT USE_STANDALONE_FUZZERS)
if(BUILD_EXAMPLES)
message(FATAL_ERROR "Cannot build the fuzzer targets and the examples together")
endif()
if(BUILD_TESTS)
message(FATAL_ERROR "Cannot build the fuzzer targets and the tests together")
endif()
endif()
add_subdirectory(fuzzers)
endif()
# Summary
feature_summary(WHAT ENABLED_FEATURES DESCRIPTION "Enabled features:")
feature_summary(WHAT DISABLED_FEATURES DESCRIPTION "Disabled features:")
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