| include(CMakePushCheckState) |
| include(CheckLibraryExists) |
| include(CheckCCompilerFlag) |
| include(CheckCXXCompilerFlag) |
| include(CheckCSourceCompiles) |
| |
| check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB) |
| if (NOT LIBCXXABI_USE_COMPILER_RT) |
| if (ANDROID) |
| check_library_exists(gcc __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_LIB) |
| else () |
| check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_S_LIB) |
| check_library_exists(gcc __aeabi_uldivmod "" LIBCXXABI_HAS_GCC_LIB) |
| endif () |
| endif () |
| |
| # libc++abi is using -nostdlib++ at the link step when available, |
| # otherwise -nodefaultlibs is used. We want all our checks to also |
| # use one of these options, otherwise we may end up with an inconsistency between |
| # the flags we think we require during configuration (if the checks are |
| # performed without -nodefaultlibs) and the flags that are actually |
| # required during compilation (which has the -nodefaultlibs). libc is |
| # required for the link to go through. We remove sanitizers from the |
| # configuration checks to avoid spurious link errors. |
| |
| check_cxx_compiler_flag(-nostdlib++ CXX_SUPPORTS_NOSTDLIBXX_FLAG) |
| if (CXX_SUPPORTS_NOSTDLIBXX_FLAG) |
| set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nostdlib++") |
| else() |
| check_c_compiler_flag(-nodefaultlibs C_SUPPORTS_NODEFAULTLIBS_FLAG) |
| if (C_SUPPORTS_NODEFAULTLIBS_FLAG) |
| set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs") |
| endif() |
| endif() |
| |
| if (CXX_SUPPORTS_NOSTDLIBXX_FLAG OR C_SUPPORTS_NODEFAULTLIBS_FLAG) |
| if (LIBCXXABI_HAS_C_LIB) |
| list(APPEND CMAKE_REQUIRED_LIBRARIES c) |
| endif () |
| if (LIBCXXABI_USE_COMPILER_RT) |
| include(HandleCompilerRT) |
| find_compiler_rt_library(builtins LIBCXXABI_BUILTINS_LIBRARY |
| FLAGS "${LIBCXXABI_COMPILE_FLAGS}") |
| if (LIBCXXABI_BUILTINS_LIBRARY) |
| list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXXABI_BUILTINS_LIBRARY}") |
| else() |
| message(WARNING "Could not find builtins library from libc++abi") |
| endif() |
| else () |
| if (LIBCXXABI_HAS_GCC_S_LIB) |
| list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s) |
| endif () |
| if (LIBCXXABI_HAS_GCC_LIB) |
| list(APPEND CMAKE_REQUIRED_LIBRARIES gcc) |
| endif () |
| endif () |
| if (MINGW) |
| # Mingw64 requires quite a few "C" runtime libraries in order for basic |
| # programs to link successfully with -nodefaultlibs. |
| if (LIBCXXABI_USE_COMPILER_RT) |
| set(MINGW_RUNTIME ${LIBCXXABI_BUILTINS_LIBRARY}) |
| else () |
| set(MINGW_RUNTIME gcc_s gcc) |
| endif() |
| set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi32 |
| shell32 user32 kernel32 mingw32 ${MINGW_RUNTIME} |
| moldname mingwex msvcrt) |
| list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES}) |
| endif() |
| if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize) |
| set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all") |
| endif () |
| if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage) |
| set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fsanitize-coverage=0") |
| endif () |
| endif () |
| |
| # Check compiler pragmas |
| if(CMAKE_CXX_COMPILER_ID MATCHES "Clang") |
| cmake_push_check_state() |
| set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=unknown-pragmas") |
| check_c_source_compiles(" |
| #pragma comment(lib, \"c\") |
| int main() { return 0; } |
| " C_SUPPORTS_COMMENT_LIB_PRAGMA) |
| cmake_pop_check_state() |
| endif() |
| |
| # Check compiler flags |
| check_cxx_compiler_flag(-nostdinc++ CXX_SUPPORTS_NOSTDINCXX_FLAG) |
| |
| # Check libraries |
| if(FUCHSIA) |
| set(LIBCXXABI_HAS_DL_LIB NO) |
| set(LIBCXXABI_HAS_PTHREAD_LIB NO) |
| check_library_exists(c __cxa_thread_atexit_impl "" |
| LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL) |
| set(LIBCXXABI_HAS_SYSTEM_LIB NO) |
| else() |
| check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB) |
| check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB) |
| check_library_exists(c __cxa_thread_atexit_impl "" |
| LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL) |
| check_library_exists(System write "" LIBCXXABI_HAS_SYSTEM_LIB) |
| endif() |