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1# HandleLibcxxFlags - A set of macros used to setup the flags used to compile2# 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' and13# 'LIBCXX_LINK_FLAGS'.14macro(add_flags)15 foreach(value ${ARGN})16 list(APPEND LIBCXX_COMPILE_FLAGS ${value})17 list(APPEND LIBCXX_LINK_FLAGS ${value})18 endforeach()19endmacro()20 21# If the specified 'condition' is true then add a list of flags to both22# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'.23macro(add_flags_if condition)24 if (${condition})25 add_flags(${ARGN})26 endif()27endmacro()28 29# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS30# 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 ${lib})50 endforeach()51endmacro()52 53# if 'condition' is true then add the specified list of libraries and flags54# to 'LIBCXX_LIBRARIES'.55macro(add_library_flags_if condition)56 if(${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