kc3-lang/libevent/cmake/CheckConstExists.cmake

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• Hash : a0bfe2c4
  Author :
  Date : 2017-03-08T17:58:26
  

  Merge branch 'cmake-configure-fixes-v2'
  
  Fixes in cmake, to make it more like configure and support some
  cross-compiling.
  
  * cmake-configure-fixes-v2:
    cmake: fix extracting of the version from git (check for number of matches)
    Detect arch4random_addrandom() existence
    Use off_t instead of ev_off_t for sendfile() (fixes android build)
    cmake: detect _GNU_SOURCE not by __GNU_LIBRARY__ only (fallback to _GNU_SOURCE)
    Check for WNOWAIT in waitpid() in runtime (not in cmake/configure)
    cmake: add <pthread.h> into CMAKE_REQUIRED_INCLUDES for sizeof(pthread_t)
    cmake: fix values for #cmakedefine
    cmake: drop duplicates from event-config template
    cmake: add value for the #cmakedefine macros (like autoconf)
    cmake: Fix checking of enum values from sysctl.h
  
  (cherry picked from commit 5aade2d30b6c5eff226cbf7b63fda5a01987ba4f)
  

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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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