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Diffstat (limited to 'cmake/Modules/HandleLibcxxFlags.cmake')
| -rw-r--r-- | cmake/Modules/HandleLibcxxFlags.cmake | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/cmake/Modules/HandleLibcxxFlags.cmake b/cmake/Modules/HandleLibcxxFlags.cmake new file mode 100644 index 000000000000..bb886fa8a01f --- /dev/null +++ b/cmake/Modules/HandleLibcxxFlags.cmake @@ -0,0 +1,169 @@ +# HandleLibcxxFlags - A set of macros used to setup the flags used to compile +# and link libc++. These macros add flags to the following CMake variables. +# - LIBCXX_COMPILE_FLAGS: flags used to compile libc++ +# - LIBCXX_LINK_FLAGS: flags used to link libc++ +# - LIBCXX_LIBRARIES: libraries to link libc++ to. + +include(CheckCXXCompilerFlag) + +unset(add_flag_if_supported) + +# Mangle the name of a compiler flag into a valid CMake identifier. +# Ex: --std=c++11 -> STD_EQ_CXX11 +macro(mangle_name str output) + string(STRIP "${str}" strippedStr) + string(REGEX REPLACE "^/" "" strippedStr "${strippedStr}") + string(REGEX REPLACE "^-+" "" strippedStr "${strippedStr}") + string(REGEX REPLACE "-+$" "" strippedStr "${strippedStr}") + string(REPLACE "-" "_" strippedStr "${strippedStr}") + string(REPLACE "=" "_EQ_" strippedStr "${strippedStr}") + string(REPLACE "+" "X" strippedStr "${strippedStr}") + string(TOUPPER "${strippedStr}" ${output}) +endmacro() + +# Remove a list of flags from all CMake variables that affect compile flags. +# This can be used to remove unwanted flags specified on the command line +# or added in other parts of LLVM's cmake configuration. +macro(remove_flags) + foreach(var ${ARGN}) + string(REPLACE "${var}" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + string(REPLACE "${var}" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}") + string(REPLACE "${var}" "" CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}") + string(REPLACE "${var}" "" CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS}") + string(REPLACE "${var}" "" CMAKE_SHARED_MODULE_FLAGS "${CMAKE_SHARED_MODULE_FLAGS}") + remove_definitions(${var}) + endforeach() +endmacro(remove_flags) + +# Add a macro definition if condition is true. +macro(define_if condition def) + if (${condition}) + add_definitions(${def}) + endif() +endmacro() + +# Add a macro definition if condition is not true. +macro(define_if_not condition def) + if (NOT ${condition}) + add_definitions(${def}) + endif() +endmacro() + +# Add a macro definition to the __config_site file if the specified condition +# is 'true'. Note that '-D${def}' is not added. Instead it is expected that +# the build include the '__config_site' header. +macro(config_define_if condition def) + if (${condition}) + set(${def} ON) + set(LIBCXX_NEEDS_SITE_CONFIG ON) + endif() +endmacro() + +macro(config_define_if_not condition def) + if (NOT ${condition}) + set(${def} ON) + set(LIBCXX_NEEDS_SITE_CONFIG ON) + endif() +endmacro() + +macro(config_define value def) + set(${def} ${value}) + set(LIBCXX_NEEDS_SITE_CONFIG ON) +endmacro() + +# Add a specified list of flags to both 'LIBCXX_COMPILE_FLAGS' and +# 'LIBCXX_LINK_FLAGS'. +macro(add_flags) + foreach(value ${ARGN}) + list(APPEND LIBCXX_COMPILE_FLAGS ${value}) + list(APPEND LIBCXX_LINK_FLAGS ${value}) + endforeach() +endmacro() + +# If the specified 'condition' is true then add a list of flags to both +# 'LIBCXX_COMPILE_FLAGS' and 'LIBCXX_LINK_FLAGS'. +macro(add_flags_if condition) + if (${condition}) + add_flags(${ARGN}) + endif() +endmacro() + +# Add each flag in the list to LIBCXX_COMPILE_FLAGS and LIBCXX_LINK_FLAGS +# if that flag is supported by the current compiler. +macro(add_flags_if_supported) + foreach(flag ${ARGN}) + mangle_name("${flag}" flagname) + check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG") + add_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag}) + endforeach() +endmacro() + +# Add a list of flags to 'LIBCXX_COMPILE_FLAGS'. +macro(add_compile_flags) + foreach(f ${ARGN}) + list(APPEND LIBCXX_COMPILE_FLAGS ${f}) + endforeach() +endmacro() + +# If 'condition' is true then add the specified list of flags to +# 'LIBCXX_COMPILE_FLAGS' +macro(add_compile_flags_if condition) + if (${condition}) + add_compile_flags(${ARGN}) + endif() +endmacro() + +# For each specified flag, add that flag to 'LIBCXX_COMPILE_FLAGS' if the +# flag is supported by the C++ compiler. +macro(add_compile_flags_if_supported) + foreach(flag ${ARGN}) + mangle_name("${flag}" flagname) + check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG") + add_compile_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag}) + endforeach() +endmacro() + +# Add a list of flags to 'LIBCXX_LINK_FLAGS'. +macro(add_link_flags) + foreach(f ${ARGN}) + list(APPEND LIBCXX_LINK_FLAGS ${f}) + endforeach() +endmacro() + +# If 'condition' is true then add the specified list of flags to +# 'LIBCXX_LINK_FLAGS' +macro(add_link_flags_if condition) + if (${condition}) + add_link_flags(${ARGN}) + endif() +endmacro() + +# For each specified flag, add that flag to 'LIBCXX_LINK_FLAGS' if the +# flag is supported by the C++ compiler. +macro(add_link_flags_if_supported) + foreach(flag ${ARGN}) + mangle_name("${flag}" flagname) + check_cxx_compiler_flag("${flag}" "LIBCXX_SUPPORTS_${flagname}_FLAG") + add_link_flags_if(LIBCXX_SUPPORTS_${flagname}_FLAG ${flag}) + endforeach() +endmacro() + +# Add a list of libraries or link flags to 'LIBCXX_LIBRARIES'. +macro(add_library_flags) + foreach(lib ${ARGN}) + list(APPEND LIBCXX_LIBRARIES ${lib}) + endforeach() +endmacro() + +# if 'condition' is true then add the specified list of libraries and flags +# to 'LIBCXX_LIBRARIES'. +macro(add_library_flags_if condition) + if(${condition}) + add_library_flags(${ARGN}) + endif() +endmacro() + +# Turn a comma separated CMake list into a space separated string. +macro(split_list listname) + string(REPLACE ";" " " ${listname} "${${listname}}") +endmacro() |