2018-12-31 20:04:05 +01:00
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# - Adds a compiler flag if it is supported by the compiler
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#
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# This function checks that the supplied compiler flag is supported and then
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# adds it to the corresponding compiler flags
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#
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# add_cxx_compiler_flag(<FLAG> [<VARIANT>])
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#
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# - Example
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#
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# include(AddCXXCompilerFlag)
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# add_cxx_compiler_flag(-Wall)
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# add_cxx_compiler_flag(-no-strict-aliasing RELEASE)
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# Requires CMake 2.6+
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if(__add_cxx_compiler_flag)
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return()
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endif()
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set(__add_cxx_compiler_flag INCLUDED)
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include(CheckCXXCompilerFlag)
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function(mangle_compiler_flag FLAG OUTPUT)
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string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
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string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
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string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
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string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
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set(${OUTPUT} "${SANITIZED_FLAG}" PARENT_SCOPE)
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endfunction(mangle_compiler_flag)
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function(add_cxx_compiler_flag FLAG)
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string(REPLACE "-Wno-" "-W" MAIN_FLAG ${FLAG})
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mangle_compiler_flag("${MAIN_FLAG}" MANGLED_FLAG)
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if (DEFINED CMAKE_REQUIRED_FLAGS)
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set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
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else()
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set(CMAKE_REQUIRED_FLAGS "${FLAG}")
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endif()
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check_cxx_compiler_flag("${MAIN_FLAG}" ${MANGLED_FLAG})
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if (DEFINED OLD_CMAKE_REQUIRED_FLAGS)
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set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
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else()
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unset(CMAKE_REQUIRED_FLAGS)
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endif()
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if(${MANGLED_FLAG})
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set(VARIANT ${ARGV1})
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if(ARGV1)
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string(TOUPPER "_${VARIANT}" VARIANT)
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endif()
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set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
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endif()
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endfunction()
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function(add_required_cxx_compiler_flag FLAG)
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string(REPLACE "-Wno-" "-W" MAIN_FLAG ${FLAG})
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mangle_compiler_flag("${MAIN_FLAG}" MANGLED_FLAG)
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set(OLD_CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}")
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check_cxx_compiler_flag("${MAIN_FLAG}" ${MANGLED_FLAG})
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set(CMAKE_REQUIRED_FLAGS "${OLD_CMAKE_REQUIRED_FLAGS}")
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2019-04-04 21:23:06 +02:00
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if (MANGLED_FLAG)
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2018-12-31 20:04:05 +01:00
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set(VARIANT ${ARGV1})
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if (ARGV1)
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string(TOUPPER "_${VARIANT}" VARIANT)
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endif()
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set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_MODULE_LINKER_FLAGS} ${FLAG}" PARENT_SCOPE)
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set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} ${FLAG}" PARENT_SCOPE)
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else()
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message(FATAL_ERROR "Required flag '${FLAG}' is not supported by the compiler")
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endif()
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endfunction()
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