kc3-lang/libevent/cmake/CheckConstExists.cmake

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• Hash : fa135bdc
  Author :
  Date : 2017-01-30T03:17:41
  

  cmake: Fix checking of enum values from sysctl.h
  
  CheckSymbolExists do not do this, so add new CheckConstExists that will
  use CheckCSourceCompiles() to check this.
  
  v2: use set() instead of string(APPEND)
  

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• cmake/CheckConstExists.cmake

• include(CheckCSourceCompiles)
  
  macro(check_const_exists CONST FILES VARIABLE)
    set(check_const_exists_source "")
    foreach(file ${FILES})
      set(check_const_exists_source
          "${check_const_exists_source}
          #include <${file}>")
    endforeach()
    set(check_const_exists_source
        "${check_const_exists_source}
        int main() { (void)${CONST}; return 0; }")
  
    check_c_source_compiles("${check_const_exists_source}" ${VARIABLE})
  
    if (${${VARIABLE}})
      set(${VARIABLE} 1 CACHE INTERNAL "Have const ${CONST}")
      message(STATUS "Looking for ${CONST} - found")
    else()
      set(${VARIABLE} 0 CACHE INTERNAL "Have const ${CONST}")
      message(STATUS "Looking for ${CONST} - not found")
    endif()
  endmacro(check_const_exists)
  

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