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      1 # - Adds a compiler flag if it is supported by the compiler
      2 #
      3 # This function checks that the supplied compiler flag is supported and then
      4 # adds it to the corresponding compiler flags
      5 #
      6 #  add_cxx_compiler_flag(<FLAG> [<VARIANT>])
      7 #
      8 # - Example
      9 #
     10 # include(AddCXXCompilerFlag)
     11 # add_cxx_compiler_flag(-Wall)
     12 # add_cxx_compiler_flag(-no-strict-aliasing RELEASE)
     13 # Requires CMake 2.6+
     14 
     15 if(__add_cxx_compiler_flag)
     16   return()
     17 endif()
     18 set(__add_cxx_compiler_flag INCLUDED)
     19 
     20 include(CheckCXXCompilerFlag)
     21 
     22 function(add_cxx_compiler_flag FLAG)
     23   string(TOUPPER "HAVE_CXX_FLAG_${FLAG}" SANITIZED_FLAG)
     24   string(REPLACE "+" "X" SANITIZED_FLAG ${SANITIZED_FLAG})
     25   string(REGEX REPLACE "[^A-Za-z_0-9]" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
     26   string(REGEX REPLACE "_+" "_" SANITIZED_FLAG ${SANITIZED_FLAG})
     27   set(CMAKE_REQUIRED_FLAGS "${FLAG}")
     28   check_cxx_compiler_flag("${FLAG}" ${SANITIZED_FLAG})
     29   if(${SANITIZED_FLAG})
     30     set(VARIANT ${ARGV1})
     31     if(ARGV1)
     32       string(TOUPPER "_${VARIANT}" VARIANT)
     33     endif()
     34     set(CMAKE_CXX_FLAGS${VARIANT} "${CMAKE_CXX_FLAGS${VARIANT}} ${FLAG}" PARENT_SCOPE)
     35   endif()
     36 endfunction()
     37 
     38