thodg/libgit2/cmake/AddCFlagIfSupported.cmake

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• Hash : bc02bcd9
  Author :
  Date : 2020-04-03T19:51:22
  

  cmake: move modules into the "cmake/" top level dir
  
  Our custom CMake module currently live in "cmake/Modules". As the
  "cmake/" directory doesn't contain anything except the "Modules"
  directory, it doesn't really make sense to have the additional
  intermediate directory. So let's instead move the modules one level up
  into the "cmake/" top level directory.
  

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• cmake/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})
  	STRING(REGEX REPLACE "^_+" "" UPCASE_PRETTY ${UPCASE_PRETTY})
  	CHECK_C_COMPILER_FLAG(${_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})
  	STRING(REGEX REPLACE "^_+" "" UPCASE_PRETTY ${UPCASE_PRETTY})
  	CHECK_C_COMPILER_FLAG(${_FLAG} IS_${UPCASE_PRETTY}_SUPPORTED)
  
  	IF(IS_${UPCASE_PRETTY}_SUPPORTED)
  		SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${_FLAG}")
  	ENDIF()
  ENDMACRO()
  

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