1include(CheckLibraryExists)
2include(CheckCCompilerFlag)
3include(CheckCXXCompilerFlag)
4
5check_library_exists(c fopen "" LIBCXXABI_HAS_C_LIB)
6if (NOT LIBCXXABI_USE_COMPILER_RT)
7  check_library_exists(gcc_s __gcc_personality_v0 "" LIBCXXABI_HAS_GCC_S_LIB)
8endif ()
9
10# libc++abi is built with -nodefaultlibs, so we want all our checks to also
11# use this option, otherwise we may end up with an inconsistency between
12# the flags we think we require during configuration (if the checks are
13# performed without -nodefaultlibs) and the flags that are actually
14# required during compilation (which has the -nodefaultlibs). libc is
15# required for the link to go through. We remove sanitizers from the
16# configuration checks to avoid spurious link errors.
17check_c_compiler_flag(-nodefaultlibs LIBCXXABI_HAS_NODEFAULTLIBS_FLAG)
18if (LIBCXXABI_HAS_NODEFAULTLIBS_FLAG)
19  set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs")
20  if (LIBCXXABI_HAS_C_LIB)
21    list(APPEND CMAKE_REQUIRED_LIBRARIES c)
22  endif ()
23  if (LIBCXXABI_USE_COMPILER_RT)
24    list(APPEND CMAKE_REQUIRED_FLAGS -rtlib=compiler-rt)
25    find_compiler_rt_library(builtins LIBCXXABI_BUILTINS_LIBRARY)
26    list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBCXXABI_BUILTINS_LIBRARY}")
27  elseif (LIBCXXABI_HAS_GCC_S_LIB)
28    list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s)
29  endif ()
30  if (MINGW)
31    # Mingw64 requires quite a few "C" runtime libraries in order for basic
32    # programs to link successfully with -nodefaultlibs.
33    if (LIBCXXABI_USE_COMPILER_RT)
34      set(MINGW_RUNTIME ${LIBCXXABI_BUILTINS_LIBRARY})
35    else ()
36      set(MINGW_RUNTIME gcc_s gcc)
37    endif()
38    set(MINGW_LIBRARIES mingw32 ${MINGW_RUNTIME} moldname mingwex msvcrt advapi32
39                        shell32 user32 kernel32 mingw32 ${MINGW_RUNTIME}
40                        moldname mingwex msvcrt)
41    list(APPEND CMAKE_REQUIRED_LIBRARIES ${MINGW_LIBRARIES})
42  endif()
43  if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize)
44    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all")
45  endif ()
46  if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage)
47    set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters")
48  endif ()
49endif ()
50
51# Check compiler flags
52check_c_compiler_flag(-funwind-tables         LIBCXXABI_HAS_FUNWIND_TABLES)
53check_cxx_compiler_flag(-fno-exceptions       LIBCXXABI_HAS_NO_EXCEPTIONS_FLAG)
54check_cxx_compiler_flag(-fno-rtti             LIBCXXABI_HAS_NO_RTTI_FLAG)
55check_cxx_compiler_flag(-fstrict-aliasing     LIBCXXABI_HAS_FSTRICT_ALIASING_FLAG)
56check_cxx_compiler_flag(-nostdinc++           LIBCXXABI_HAS_NOSTDINCXX_FLAG)
57check_cxx_compiler_flag(-Wall                 LIBCXXABI_HAS_WALL_FLAG)
58check_cxx_compiler_flag(-W                    LIBCXXABI_HAS_W_FLAG)
59check_cxx_compiler_flag(-Wunused-function     LIBCXXABI_HAS_WUNUSED_FUNCTION_FLAG)
60check_cxx_compiler_flag(-Wunused-variable     LIBCXXABI_HAS_WUNUSED_VARIABLE_FLAG)
61check_cxx_compiler_flag(-Wunused-parameter    LIBCXXABI_HAS_WUNUSED_PARAMETER_FLAG)
62check_cxx_compiler_flag(-Wstrict-aliasing     LIBCXXABI_HAS_WSTRICT_ALIASING_FLAG)
63check_cxx_compiler_flag(-Wstrict-overflow     LIBCXXABI_HAS_WSTRICT_OVERFLOW_FLAG)
64check_cxx_compiler_flag(-Wwrite-strings       LIBCXXABI_HAS_WWRITE_STRINGS_FLAG)
65check_cxx_compiler_flag(-Wchar-subscripts     LIBCXXABI_HAS_WCHAR_SUBSCRIPTS_FLAG)
66check_cxx_compiler_flag(-Wmismatched-tags     LIBCXXABI_HAS_WMISMATCHED_TAGS_FLAG)
67check_cxx_compiler_flag(-Wmissing-braces      LIBCXXABI_HAS_WMISSING_BRACES_FLAG)
68check_cxx_compiler_flag(-Wshorten-64-to-32    LIBCXXABI_HAS_WSHORTEN_64_TO_32_FLAG)
69check_cxx_compiler_flag(-Wsign-conversion     LIBCXXABI_HAS_WSIGN_CONVERSION_FLAG)
70check_cxx_compiler_flag(-Wsign-compare        LIBCXXABI_HAS_WSIGN_COMPARE_FLAG)
71check_cxx_compiler_flag(-Wshadow              LIBCXXABI_HAS_WSHADOW_FLAG)
72check_cxx_compiler_flag(-Wconversion          LIBCXXABI_HAS_WCONVERSION_FLAG)
73check_cxx_compiler_flag(-Wnewline-eof         LIBCXXABI_HAS_WNEWLINE_EOF_FLAG)
74check_cxx_compiler_flag(-Wundef               LIBCXXABI_HAS_WUNDEF_FLAG)
75check_cxx_compiler_flag(-pedantic             LIBCXXABI_HAS_PEDANTIC_FLAG)
76check_cxx_compiler_flag(-Werror               LIBCXXABI_HAS_WERROR_FLAG)
77check_cxx_compiler_flag(-Wno-error            LIBCXXABI_HAS_WNO_ERROR_FLAG)
78check_cxx_compiler_flag(/WX                   LIBCXXABI_HAS_WX_FLAG)
79check_cxx_compiler_flag(/WX-                  LIBCXXABI_HAS_NO_WX_FLAG)
80check_cxx_compiler_flag(/EHsc                 LIBCXXABI_HAS_EHSC_FLAG)
81check_cxx_compiler_flag(/EHs-                 LIBCXXABI_HAS_NO_EHS_FLAG)
82check_cxx_compiler_flag(/EHa-                 LIBCXXABI_HAS_NO_EHA_FLAG)
83check_cxx_compiler_flag(/GR-                  LIBCXXABI_HAS_NO_GR_FLAG)
84
85# Check libraries
86check_library_exists(dl dladdr "" LIBCXXABI_HAS_DL_LIB)
87check_library_exists(pthread pthread_once "" LIBCXXABI_HAS_PTHREAD_LIB)
88check_library_exists(c __cxa_thread_atexit_impl ""
89  LIBCXXABI_HAS_CXA_THREAD_ATEXIT_IMPL)
90