cmake/AddCFlagIfSupported.cmake

   1 # - Append compiler flag to CMAKE_C_FLAGS if compiler supports it
   2 # ADD_C_FLAG_IF_SUPPORTED(<flag>)
   3 #  <flag> - the compiler flag to test
   4 # This internally calls the CHECK_C_COMPILER_FLAG macro.
   5
   6 include(CheckCCompilerFlag)
   7
   8 macro(ADD_C_FLAG _FLAG)
   9         string(TOUPPER ${_FLAG} UPCASE)
  10         string(REGEX REPLACE "[-=]" "_" UPCASE_PRETTY ${UPCASE})
  11         string(REGEX REPLACE "^_+" "" UPCASE_PRETTY ${UPCASE_PRETTY})
  12         check_c_compiler_flag(${_FLAG} IS_${UPCASE_PRETTY}_SUPPORTED)
  13
  14         if(IS_${UPCASE_PRETTY}_SUPPORTED)
  15                 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FLAG}")
  16         else()
  17                 message(FATAL_ERROR "Required flag ${_FLAG} is not supported")
  18         endif()
  19 endmacro()
  20
  21 macro(ADD_C_FLAG_IF_SUPPORTED _FLAG)
  22         string(TOUPPER ${_FLAG} UPCASE)
  23         string(REGEX REPLACE "[-=]" "_" UPCASE_PRETTY ${UPCASE})
  24         string(REGEX REPLACE "^_+" "" UPCASE_PRETTY ${UPCASE_PRETTY})
  25         check_c_compiler_flag(${_FLAG} IS_${UPCASE_PRETTY}_SUPPORTED)
  26
  27         if(IS_${UPCASE_PRETTY}_SUPPORTED)
  28                 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FLAG}")
  29         endif()
  30 endmacro()