cmake/Modules/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()