libcxxabi/cmake/config-ix.cmake

   1 include(CMakePushCheckState)
   2 include(CheckLibraryExists)
   3 include(CheckCCompilerFlag)
   4 include(CheckCXXCompilerFlag)
   5 include(CheckCSourceCompiles)
   6
   7 check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB)
   8 if (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 ()
  15 endif ()
  16
  17 # libc++abi is built with -nodefaultlibs, so we want all our checks to also
  18 # use this option, otherwise we may end up with an inconsistency between
  19 # the flags we think we require during configuration (if the checks are
  20 # performed without -nodefaultlibs) and the flags that are actually
  21 # required during compilation (which has the -nodefaultlibs). libc is
  22 # required for the link to go through. We remove sanitizers from the
  23 # configuration checks to avoid spurious link errors.
  24 check_c_compiler_flag(-nodefaultlibs LIBCXXABI_HAS_NODEFAULTLIBS_FLAG)
  25 if (LIBCXXABI_HAS_NODEFAULTLIBS_FLAG)
  26   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
  27   if (LIBCXXABI_HAS_C_LIB)
  28     list(APPEND CMAKE_REQUIRED_LIBRARIES c)
  29   endif ()
  30   if (LIBCXXABI_USE_COMPILER_RT)
  31     list(APPEND CMAKE_REQUIRED_FLAGS -rtlib=compiler-rt)
  32     find_compiler_rt_library(builtins LIBCXXABI_BUILTINS_LIBRARY)
  33     list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXXABI_BUILTINS_LIBRARY}")
  34   else ()
  35     if (LIBCXXABI_HAS_GCC_S_LIB)
  36       list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
  37     endif ()
  38     if (LIBCXXABI_HAS_GCC_LIB)
  39       list(APPEND CMAKE_REQUIRED_LIBRARIES gcc)
  40     endif ()
  41   endif ()
  42   if (MINGW)
  43     # Mingw64 requires quite a few "C" runtime libraries in order for basic
  44     # programs to link successfully with -nodefaultlibs.
  45     if (LIBCXXABI_USE_COMPILER_RT)
  46       set(MINGW_RUNTIME ${LIBCXXABI_BUILTINS_LIBRARY})
  47     else ()
  48       set(MINGW_RUNTIME gcc_s gcc)
  49     endif()
  50     set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi32
  51                         shell32 user32 kernel32 mingw32 ${MINGW_RUNTIME}
  52                         moldname mingwex msvcrt)
  53     list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
  54   endif()
  55   if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
  56     set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")
  57   endif ()
  58   if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage)
  59     set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters")
  60   endif ()
  61 endif ()
  62
  63 # Check compiler pragmas
  64 if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  65   cmake_push_check_state()
  66   set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -Werror=unknown-pragmas")
  67   check_c_source_compiles("
  68 #pragma comment(lib, \"c\")
  69 int main() { return 0; }
  70 " LIBCXXABI_HAS_COMMENT_LIB_PRAGMA)
  71   cmake_pop_check_state()
  72 endif()
  73
  74 # Check compiler flags
  75 check_cxx_compiler_flag(-nostdinc++ LIBCXXABI_HAS_NOSTDINCXX_FLAG)
  76
  77 # Check libraries
  78 if(FUCHSIA)
  79   set(LIBCXXABI_HAS_DL_LIB NO)
  80   set(LIBCXXABI_HAS_PTHREAD_LIB NO)
  81   check_library_exists(c __cxa_thread_atexit_impl ""
  82     LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)
  83   set(LIBCXXABI_HAS_SYSTEM_LIB NO)
  84 else()
  85   check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)
  86   check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)
  87   check_library_exists(c __cxa_thread_atexit_impl ""
  88     LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)
  89   check_library_exists(System write "" LIBCXXABI_HAS_SYSTEM_LIB)
  90 endif()