CheckConstExists.cmake

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Author : Azat Khuzhin
Date : 2017-01-30 03:17:41
Hash : fa135bdc
Message : 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)

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)

kc3-lang/libevent/cmake/CheckConstExists.cmake

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kc3-lang/libevent /cmake/CheckConstExists.cmake