1 2include(CheckCCompilerFlag) 3include(CheckCXXCompilerFlag) 4include(CheckLibraryExists) 5 6check_library_exists(c fopen "" LIBUNWIND_HAS_C_LIB) 7 8if (NOT LIBUNWIND_USE_COMPILER_RT) 9 check_library_exists(gcc_s __gcc_personality_v0 "" LIBUNWIND_HAS_GCC_S_LIB) 10endif() 11 12# libunwind is built with -nodefaultlibs, so we want all our checks to also 13# use this option, otherwise we may end up with an inconsistency between 14# the flags we think we require during configuration (if the checks are 15# performed without -nodefaultlibs) and the flags that are actually 16# required during compilation (which has the -nodefaultlibs). libc is 17# required for the link to go through. We remove sanitizers from the 18# configuration checks to avoid spurious link errors. 19check_c_compiler_flag(-nodefaultlibs LIBUNWIND_HAS_NODEFAULTLIBS_FLAG) 20if (LIBUNWIND_HAS_NODEFAULTLIBS_FLAG) 21 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -nodefaultlibs") 22 if (LIBUNWIND_HAS_C_LIB) 23 list(APPEND CMAKE_REQUIRED_LIBRARIES c) 24 endif () 25 if (LIBUNWIND_USE_COMPILER_RT) 26 list(APPEND CMAKE_REQUIRED_FLAGS -rtlib=compiler-rt) 27 find_compiler_rt_library(builtins LIBUNWIND_BUILTINS_LIBRARY) 28 list(APPEND CMAKE_REQUIRED_LIBRARIES "${LIBUNWIND_BUILTINS_LIBRARY}") 29 elseif (LIBUNWIND_HAS_GCC_S_LIB) 30 list(APPEND CMAKE_REQUIRED_LIBRARIES gcc_s) 31 endif () 32 if (CMAKE_C_FLAGS MATCHES -fsanitize OR CMAKE_CXX_FLAGS MATCHES -fsanitize) 33 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize=all") 34 endif () 35 if (CMAKE_C_FLAGS MATCHES -fsanitize-coverage OR CMAKE_CXX_FLAGS MATCHES -fsanitize-coverage) 36 set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -fno-sanitize-coverage=edge,trace-cmp,indirect-calls,8bit-counters") 37 endif () 38endif () 39 40# Check compiler flags 41check_c_compiler_flag(-funwind-tables LIBUNWIND_HAS_FUNWIND_TABLES) 42check_cxx_compiler_flag(-fPIC LIBUNWIND_HAS_FPIC_FLAG) 43check_cxx_compiler_flag(-fno-exceptions LIBUNWIND_HAS_NO_EXCEPTIONS_FLAG) 44check_cxx_compiler_flag(-fno-rtti LIBUNWIND_HAS_NO_RTTI_FLAG) 45check_cxx_compiler_flag(-fstrict-aliasing LIBUNWIND_HAS_FSTRICT_ALIASING_FLAG) 46check_cxx_compiler_flag(-nostdinc++ LIBUNWIND_HAS_NOSTDINCXX_FLAG) 47check_cxx_compiler_flag(-Wall LIBUNWIND_HAS_WALL_FLAG) 48check_cxx_compiler_flag(-W LIBUNWIND_HAS_W_FLAG) 49check_cxx_compiler_flag(-Wno-unused-function LIBUNWIND_HAS_WNO_UNUSED_FUNCTION_FLAG) 50check_cxx_compiler_flag(-Wunused-variable LIBUNWIND_HAS_WUNUSED_VARIABLE_FLAG) 51check_cxx_compiler_flag(-Wunused-parameter LIBUNWIND_HAS_WUNUSED_PARAMETER_FLAG) 52check_cxx_compiler_flag(-Wstrict-aliasing LIBUNWIND_HAS_WSTRICT_ALIASING_FLAG) 53check_cxx_compiler_flag(-Wstrict-overflow LIBUNWIND_HAS_WSTRICT_OVERFLOW_FLAG) 54check_cxx_compiler_flag(-Wwrite-strings LIBUNWIND_HAS_WWRITE_STRINGS_FLAG) 55check_cxx_compiler_flag(-Wchar-subscripts LIBUNWIND_HAS_WCHAR_SUBSCRIPTS_FLAG) 56check_cxx_compiler_flag(-Wmismatched-tags LIBUNWIND_HAS_WMISMATCHED_TAGS_FLAG) 57check_cxx_compiler_flag(-Wmissing-braces LIBUNWIND_HAS_WMISSING_BRACES_FLAG) 58check_cxx_compiler_flag(-Wshorten-64-to-32 LIBUNWIND_HAS_WSHORTEN_64_TO_32_FLAG) 59check_cxx_compiler_flag(-Wsign-conversion LIBUNWIND_HAS_WSIGN_CONVERSION_FLAG) 60check_cxx_compiler_flag(-Wsign-compare LIBUNWIND_HAS_WSIGN_COMPARE_FLAG) 61check_cxx_compiler_flag(-Wshadow LIBUNWIND_HAS_WSHADOW_FLAG) 62check_cxx_compiler_flag(-Wconversion LIBUNWIND_HAS_WCONVERSION_FLAG) 63check_cxx_compiler_flag(-Wnewline-eof LIBUNWIND_HAS_WNEWLINE_EOF_FLAG) 64check_cxx_compiler_flag(-Wundef LIBUNWIND_HAS_WUNDEF_FLAG) 65check_cxx_compiler_flag(-pedantic LIBUNWIND_HAS_PEDANTIC_FLAG) 66check_cxx_compiler_flag(-Werror LIBUNWIND_HAS_WERROR_FLAG) 67check_cxx_compiler_flag(-Wno-error LIBUNWIND_HAS_WNO_ERROR_FLAG) 68check_cxx_compiler_flag(/WX LIBUNWIND_HAS_WX_FLAG) 69check_cxx_compiler_flag(/WX- LIBUNWIND_HAS_NO_WX_FLAG) 70check_cxx_compiler_flag(/EHsc LIBUNWIND_HAS_EHSC_FLAG) 71check_cxx_compiler_flag(/EHs- LIBUNWIND_HAS_NO_EHS_FLAG) 72check_cxx_compiler_flag(/EHa- LIBUNWIND_HAS_NO_EHA_FLAG) 73check_cxx_compiler_flag(/GR- LIBUNWIND_HAS_NO_GR_FLAG) 74check_cxx_compiler_flag(-std=c++11 LIBUNWIND_HAS_STD_CXX11) 75 76if(LIBUNWIND_HAS_STD_CXX11) 77 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11") 78endif() 79 80check_library_exists(dl dladdr "" LIBUNWIND_HAS_DL_LIB) 81check_library_exists(pthread pthread_once "" LIBUNWIND_HAS_PTHREAD_LIB) 82 83