cmake/TargetSupportsRelocatable.cmake

   1 function(TARGET_SUPPORTS_RELOCATABLE)
   2   string(RANDOM RANDOM)
   3   set(CMAKETMP ${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${RANDOM})
   4   get_cmake_property(ENABLED_LANGUAGES ENABLED_LANGUAGES)
   5   foreach(LANG C ${ENABLED_LANGUAGES})
   6     if(CMAKE_${LANG}_COMPILER)
   7       set(CMAKE_COMPILER ${CMAKE_${LANG}_COMPILER})
   8       break()
   9     endif()
  10   endforeach()
  11   if(NOT CMAKE_COMPILER)
  12     return()
  13   endif()
  14   file(WRITE ${CMAKETMP}/${RANDOM}.c "")
  15   execute_process(COMMAND ${CMAKE_COMPILER} -nostdlib -o ${RANDOM}.o -r ${RANDOM}.c
  16     WORKING_DIRECTORY ${CMAKETMP} ERROR_QUIET OUTPUT_QUIET RESULT_VARIABLE result
  17   )
  18   if(${result} EQUAL 0)
  19     set(TARGET_SUPPORTS_RELOCATABLE 1 CACHE INTERNAL "Test TARGET_SUPPORTS_RELOCATABLE")
  20   else()
  21     set(TARGET_SUPPORTS_RELOCATABLE 0 CACHE INTERNAL "Test TARGET_SUPPORTS_RELOCATABLE")
  22   endif()
  23   file(REMOVE_RECURSE ${CMAKETMP})
  24 endfunction()
  25 if(NOT DEFINED TARGET_SUPPORTS_RELOCATABLE)
  26   TARGET_SUPPORTS_RELOCATABLE()
  27 endif()