thodg/libgit2/cmake/Modules/AddCFlagIfSupported.cmake

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• Hash : 186a7ba5
  Author :
  Date : 2018-07-19T15:13:40
  

  cmake: error out if required C flags are not supported We do want to notify users compiling our source code early on if they try to use C flags which aren't supported. Add a new macro `AddCFlag`, which results in a fatal error in case the flag is not supported, and use it for our fuzzing flags.

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• cmake/Modules/AddCFlagIfSupported.cmake

• # - Append compiler flag to CMAKE_C_FLAGS if compiler supports it
  # ADD_C_FLAG_IF_SUPPORTED(<flag>)
  #  <flag> - the compiler flag to test
  # This internally calls the CHECK_C_COMPILER_FLAG macro.
  
  INCLUDE(CheckCCompilerFlag)
  
  MACRO(ADD_C_FLAG _FLAG)
  	STRING(TOUPPER ${_FLAG} UPCASE)
  	STRING(REGEX REPLACE "^-" "" UPCASE_PRETTY ${UPCASE})
  	CHECK_C_COMPILER_FLAG(${_FLAG} IS_${UPCASE_PRETTY}_SUPPORTED)
  
  	IF(IS_${UPCASE_PRETTY}_SUPPORTED)
  		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FLAG}")
  	ELSE()
  		MESSAGE(FATAL_ERROR "Required flag ${_FLAG} is not supported")
  	ENDIF()
  ENDMACRO()
  
  MACRO(ADD_C_FLAG_IF_SUPPORTED _FLAG)
  	STRING(TOUPPER ${_FLAG} UPCASE)
  	STRING(REGEX REPLACE "^-" "" UPCASE_PRETTY ${UPCASE})
  	CHECK_C_COMPILER_FLAG(${_FLAG} IS_${UPCASE_PRETTY}_SUPPORTED)
  
  	IF(IS_${UPCASE_PRETTY}_SUPPORTED)
  		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FLAG}")
  	ENDIF()
  ENDMACRO()
  

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