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1include(CMakePushCheckState)2include(CheckLibraryExists)3include(CheckCCompilerFlag)4include(CheckCXXCompilerFlag)5include(CheckCSourceCompiles)6 7check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB)8if (NOT LIBCXXABI_USE_COMPILER_RT)9 if (ANDROID)10 check_library_exists(gcc __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_LIB)11 else ()12 check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_S_LIB)13 check_library_exists(gcc __aeabi_uldivmod "" LIBCXXABI_HAS_GCC_LIB)14 endif ()15endif ()16 17# libc++abi is using -nostdlib++ at the link step when available,18# otherwise -nodefaultlibs is used. We want all our checks to also19# use one of these options, otherwise we may end up with an inconsistency between20# the flags we think we require during configuration (if the checks are21# performed without -nodefaultlibs) and the flags that are actually22# required during compilation (which has the -nodefaultlibs). libc is23# required for the link to go through. We remove sanitizers from the24# configuration checks to avoid spurious link errors.25 26check_cxx_compiler_flag(-nostdlib++ CXX_SUPPORTS_NOSTDLIBXX_FLAG)27if (CXX_SUPPORTS_NOSTDLIBXX_FLAG)28 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nostdlib++")29else()30 check_c_compiler_flag(-nodefaultlibs C_SUPPORTS_NODEFAULTLIBS_FLAG)31 if (C_SUPPORTS_NODEFAULTLIBS_FLAG)32 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")33 endif()34endif()35 36# Only link against compiler-rt manually if we use -nodefaultlibs, since37# otherwise the compiler will do the right thing on its own.38if (NOT CXX_SUPPORTS_NOSTDLIBXX_FLAG AND C_SUPPORTS_NODEFAULTLIBS_FLAG)39 if (LIBCXXABI_HAS_C_LIB)40 list(APPEND CMAKE_REQUIRED_LIBRARIES c)41 endif ()42 if (LIBCXXABI_USE_COMPILER_RT)43 include(HandleCompilerRT)44 find_compiler_rt_library(builtins LIBCXXABI_BUILTINS_LIBRARY45 FLAGS "${LIBCXXABI_COMPILE_FLAGS}")46 if (LIBCXXABI_BUILTINS_LIBRARY)47 list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXXABI_BUILTINS_LIBRARY}")48 else()49 message(WARNING "Could not find builtins library from libc++abi")50 endif()51 else ()52 if (LIBCXXABI_HAS_GCC_S_LIB)53 list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)54 endif ()55 if (LIBCXXABI_HAS_GCC_LIB)56 list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)57 endif ()58 endif ()59 if (MINGW)60 # Mingw64 requires quite a few "C" runtime libraries in order for basic61 # programs to link successfully with -nodefaultlibs.62 if (LIBCXXABI_USE_COMPILER_RT)63 set(MINGW_RUNTIME ${LIBCXXABI_BUILTINS_LIBRARY})64 else ()65 set(MINGW_RUNTIME gcc_s gcc)66 endif()67 set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi3268 shell32 user32 kernel32 mingw32 ${MINGW_RUNTIME}69 moldname mingwex msvcrt)70 list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})71 endif()72endif()73 74if (CXX_SUPPORTS_NOSTDLIBXX_FLAG OR C_SUPPORTS_NODEFAULTLIBS_FLAG)75 if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)76 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")77 endif ()78 if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage)79 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fsanitize-coverage=0")80 endif ()81endif ()82 83# Check compiler pragmas84if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")85 cmake_push_check_state()86 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=unknown-pragmas")87 check_c_source_compiles("88#pragma comment(lib, \"c\")89int main(void) { return 0; }90" C_SUPPORTS_COMMENT_LIB_PRAGMA)91 cmake_pop_check_state()92endif()93 94# Check compiler flags95check_cxx_compiler_flag(-nostdinc++ CXX_SUPPORTS_NOSTDINCXX_FLAG)96 97# Check libraries98if(FUCHSIA)99 set(LIBCXXABI_HAS_DL_LIB NO)100 set(LIBCXXABI_HAS_PTHREAD_LIB NO)101 check_library_exists(c __cxa_thread_atexit_impl ""102 LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)103elseif(ANDROID)104 set(LIBCXXABI_HAS_DL_LIB YES)105 set(LIBCXXABI_HAS_PTHREAD_LIB NO)106 check_library_exists(c __cxa_thread_atexit_impl ""107 LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)108else()109 check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)110 check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)111 check_library_exists(c __cxa_thread_atexit_impl ""112 LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)113endif()114