forked from OSchip/llvm-project
72 lines
2.8 KiB
CMake
72 lines
2.8 KiB
CMake
include(CheckLibraryExists)
|
|
include(CheckCXXCompilerFlag)
|
|
|
|
if(WIN32 AND NOT MINGW)
|
|
# NOTE(compnerd) this is technically a lie, there is msvcrt, but for now, lets
|
|
# let the default linking take care of that.
|
|
set(LIBCXX_HAS_C_LIB NO)
|
|
else()
|
|
check_library_exists(c fopen "" LIBCXX_HAS_C_LIB)
|
|
endif()
|
|
|
|
if (NOT LIBCXX_USE_COMPILER_RT)
|
|
if(WIN32 AND NOT MINGW)
|
|
set(LIBCXX_HAS_GCC_S_LIB NO)
|
|
else()
|
|
check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXX_HAS_GCC_S_LIB)
|
|
endif()
|
|
endif()
|
|
|
|
# libc++ is built with -nodefaultlibs, so we want all our checks to also
|
|
# use this option, 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(-nodefaultlibs LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
|
|
if (LIBCXX_SUPPORTS_NODEFAULTLIBS_FLAG)
|
|
set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
|
|
if (LIBCXX_HAS_C_LIB)
|
|
list(APPEND CMAKE_REQUIRED_LIBRARIES c)
|
|
endif ()
|
|
if (LIBCXX_USE_COMPILER_RT)
|
|
list(APPEND CMAKE_REQUIRED_LIBRARIES -rtlib=compiler-rt)
|
|
elseif (LIBCXX_HAS_GCC_S_LIB)
|
|
list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
|
|
endif ()
|
|
if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
|
|
set(CMAKE_REQUIRED_FLAGS "${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} -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters")
|
|
endif ()
|
|
endif ()
|
|
|
|
if(NOT WIN32 OR MINGW)
|
|
include(CheckLibcxxAtomic)
|
|
endif()
|
|
|
|
# Check compiler flags
|
|
|
|
check_cxx_compiler_flag(/WX LIBCXX_HAS_WX_FLAG)
|
|
check_cxx_compiler_flag(/WX- LIBCXX_HAS_NO_WX_FLAG)
|
|
check_cxx_compiler_flag(/EHsc LIBCXX_HAS_EHSC_FLAG)
|
|
check_cxx_compiler_flag(/EHs- LIBCXX_HAS_NO_EHS_FLAG)
|
|
check_cxx_compiler_flag(/EHa- LIBCXX_HAS_NO_EHA_FLAG)
|
|
check_cxx_compiler_flag(/GR- LIBCXX_HAS_NO_GR_FLAG)
|
|
|
|
|
|
# Check libraries
|
|
if(WIN32 AND NOT MINGW)
|
|
# TODO(compnerd) do we want to support an emulation layer that allows for the
|
|
# use of pthread-win32 or similar libraries to emulate pthreads on Windows?
|
|
set(LIBCXX_HAS_PTHREAD_LIB NO)
|
|
set(LIBCXX_HAS_M_LIB NO)
|
|
set(LIBCXX_HAS_RT_LIB NO)
|
|
else()
|
|
check_library_exists(pthread pthread_create "" LIBCXX_HAS_PTHREAD_LIB)
|
|
check_library_exists(m ccos "" LIBCXX_HAS_M_LIB)
|
|
check_library_exists(rt clock_gettime "" LIBCXX_HAS_RT_LIB)
|
|
endif()
|