thodg/libgit2/CMakeLists.txt
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Hash : 0c8ff50f
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Date : 2018-04-27T10:38:49
cmake: resolve libraries found by pkg-config Libraries found by CMake modules are usually handled with their full path. This makes linking against those libraries a lot more robust when it comes to libraries in non-standard locations, as otherwise we might mix up libraries from different locations when link directories are given. One excemption are libraries found by PKG_CHECK_MODULES. Instead of returning libraries with their complete path, it will return the variable names as well as a set of link directories. In case where multiple sets of the same library are installed in different locations, this can lead the compiler to link against the wrong libraries in the end, when link directories of other dependencies are added. To fix this shortcoming, we need to manually resolve library paths returned by CMake against their respective library directories. This is an easy task to do with `FIND_LIBRARY`.
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CMakeLists.txt
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# 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 2.8.11) CMAKE_POLICY(SET CMP0015 NEW) IF (POLICY CMP0051) CMAKE_POLICY(SET CMP0051 NEW) ENDIF() IF (POLICY CMP0042) CMAKE_POLICY(SET CMP0042 NEW) ENDIF() # 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(AddCFlagIfSupported) INCLUDE(FindPkgLibraries) INCLUDE(FindThreads) INCLUDE(FindStatNsec) INCLUDE(IdeSplitSources) INCLUDE(FeatureSummary) INCLUDE(EnableWarnings) # 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" ON ) 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 ) SET(SHA1_BACKEND "CollisionDetection" CACHE STRING "Backend to use for SHA1. One of Generic, OpenSSL, Win32, CommonCrypto, CollisionDetection. ") OPTION( USE_SSH "Link with libssh to enable SSH support" ON ) OPTION( USE_HTTPS "Enable HTTPS support. Can be set to a specific backend" ON ) OPTION( USE_GSSAPI "Link with libgssapi for SPNEGO auth" OFF ) OPTION( VALGRIND "Configure build for valgrind" OFF ) OPTION( CURL "Use curl for HTTP if available" ON) OPTION( USE_EXT_HTTP_PARSER "Use system HTTP_Parser if available" ON) OPTION( DEBUG_POOL "Enable debug pool allocator" OFF ) OPTION( ENABLE_WERROR "Enable compilation with -Werror" OFF ) OPTION( USE_BUNDLED_ZLIB "Use the bundled version of zlib" OFF ) IF (UNIX AND NOT APPLE) 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 is only available when building with MSVC. By default, libgit2 # is build using the cdecl calling convention, which is useful if you're # writing C. However, the CLR and Win32 API both expect stdcall. # # If you are writing a CLR program and want to link to libgit2, you'll want # to turn this on by invoking CMake with the "-DSTDCALL=ON" argument. OPTION( STDCALL "Build libgit2 with the __stdcall convention" OFF ) # 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 ) ENDIF() IF(WIN32) # By default, libgit2 is built with WinHTTP. To use the built-in # HTTP transport, invoke CMake with the "-DWINHTTP=OFF" argument. OPTION( WINHTTP "Use Win32 WinHTTP routines" ON ) ENDIF() IF(MSVC) # Enable MSVC CRTDBG memory leak reporting when in debug mode. OPTION(MSVC_CRTDBG "Enable CRTDBG memory leak reporting" OFF) ENDIF() FILE(STRINGS "${libgit2_SOURCE_DIR}/include/git2/version.h" GIT2_HEADER REGEX "^#define LIBGIT2_VERSION \"[^\"]*\"$") 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}.${LIBGIT2_VERSION_REV}") FILE(STRINGS "${libgit2_SOURCE_DIR}/include/git2/version.h" GIT2_HEADER_SOVERSION REGEX "^#define LIBGIT2_SOVERSION [0-9]+$") STRING(REGEX REPLACE "^.*LIBGIT2_SOVERSION ([0-9]+)$" "\\1" LIBGIT2_SOVERSION "${GIT2_HEADER_SOVERSION}") # Platform specific compilation flags IF (MSVC) ADD_DEFINITIONS(-D_SCL_SECURE_NO_WARNINGS) ADD_DEFINITIONS(-D_CRT_SECURE_NO_DEPRECATE) ADD_DEFINITIONS(-D_CRT_NONSTDC_NO_DEPRECATE) STRING(REPLACE "/Zm1000" " " CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") # /GF - String pooling # /MP - Parallel build SET(CMAKE_C_FLAGS "/GF /MP /nologo ${CMAKE_C_FLAGS}") IF (STDCALL) # /Gz - stdcall calling convention SET(CMAKE_C_FLAGS "${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() IF (MSVC_CRTDBG) SET(GIT_MSVC_CRTDBG 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 ${CRT_FLAG_RELEASE}") # /DYNAMICBASE - Address space load randomization (ASLR) # /NXCOMPAT - Data execution prevention (DEP) # /LARGEADDRESSAWARE - >2GB user address space on x86 # /VERSION - Embed version information in PE header SET(CMAKE_EXE_LINKER_FLAGS "/DYNAMICBASE /NXCOMPAT /LARGEADDRESSAWARE /VERSION:${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}") 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() 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 "-std=c99 -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(missing-field-initializers) ENABLE_WARNINGS(strict-aliasing) ENABLE_WARNINGS(strict-prototypes) ENABLE_WARNINGS(declaration-after-statement) ENABLE_WARNINGS(shift-count-overflow) DISABLE_WARNINGS(unused-const-variable) DISABLE_WARNINGS(unused-function) IF (APPLE) # Apple deprecated OpenSSL DISABLE_WARNINGS(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() ADD_SUBDIRECTORY(src) # Tests IF (NOT MSVC) IF (NOT BUILD_SHARED_LIBS) SET(CMAKE_FIND_LIBRARY_SUFFIXES ".a") ENDIF() ENDIF () IF (BUILD_CLAR) ENABLE_TESTING() ADD_SUBDIRECTORY(tests) 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) ADD_SUBDIRECTORY(examples) ENDIF () IF(CMAKE_VERSION VERSION_GREATER 3) FEATURE_SUMMARY(WHAT ENABLED_FEATURES DESCRIPTION "Enabled features:") FEATURE_SUMMARY(WHAT DISABLED_FEATURES DESCRIPTION "Disabled features:") ELSE() PRINT_ENABLED_FEATURES() PRINT_DISABLED_FEATURES() ENDIF()