1# HandleLibcxxFlags - A set of macros used to setup the flags used to compile 2# and link libc++. These macros add flags to the following CMake variables. 3# - LIBCXX_COMPILE_FLAGS: flags used to compile libc++ 4# - LIBCXX_LINK_FLAGS: flags used to link libc++ 5# - LIBCXX_LIBRARIES: libraries to link libc++ to. 6 7include(CheckCXXCompilerFlag) 8include(HandleFlags) 9 10unset(add_flag_if_supported) 11 12# Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and 13# 'LIBCXX_LINK_FLAGS'. 14macro(add_flags) 15 foreach(value ${ARGN}) 16 list(APPEND LIBCXX_COMPILE_FLAGS ${value}) 17 list(APPEND LIBCXX_LINK_FLAGS ${value}) 18 endforeach() 19endmacro() 20 21# If the specified 'condition' is true then add a list of flags to both 22# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'. 23macro(add_flags_if condition) 24 if (${condition}) 25 add_flags(${ARGN}) 26 endif() 27endmacro() 28 29# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS 30# if that flag is supported by the current compiler. 31macro(add_flags_if_supported) 32 foreach(flag ${ARGN}) 33 mangle_name("${flag}" flagname) 34 check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG") 35 add_flags_if(CXX_SUPPORTS_${flagname}_FLAG ${flag}) 36 endforeach() 37endmacro() 38 39# Add a list of flags to 'LIBCXX_LINK_FLAGS'. 40macro(add_link_flags) 41 foreach(f ${ARGN}) 42 list(APPEND LIBCXX_LINK_FLAGS ${f}) 43 endforeach() 44endmacro() 45 46# Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'. 47macro(add_library_flags) 48 foreach(lib ${ARGN}) 49 list(APPEND LIBCXX_LIBRARIES ${lib}) 50 endforeach() 51endmacro() 52 53# if 'condition' is true then add the specified list of libraries and flags 54# to 'LIBCXX_LIBRARIES'. 55macro(add_library_flags_if condition) 56 if(${condition}) 57 add_library_flags(${ARGN}) 58 endif() 59endmacro() 60 61# For each specified flag, add that link flag to the provided target. 62# The flags are added with the given visibility, i.e. PUBLIC|PRIVATE|INTERFACE. 63function(target_add_link_flags_if_supported target visibility) 64 foreach(flag ${ARGN}) 65 mangle_name("${flag}" flagname) 66 check_cxx_compiler_flag("${flag}" "CXX_SUPPORTS_${flagname}_FLAG") 67 if (CXX_SUPPORTS_${flagname}_FLAG) 68 target_link_libraries(${target} ${visibility} ${flag}) 69 endif() 70 endforeach() 71endfunction() 72