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      1 function(check_lto)
      2     if (DEFINED LTO_WORKS)
      3         return()
      4     endif()
      5 
      6     set(LTO_WORKS FALSE CACHE INTERNAL "LTO works")
      7 
      8     CHECK_CXX_COMPILER_FLAG("-flto" HAS_LTO_FLAG)
      9 
     10     if (NOT HAS_LTO_FLAG)
     11         return()
     12     endif()
     13 
     14     find_program(LTO_AR NAMES "${CMAKE_C_COMPILER}-ar" gcc-ar)
     15     find_program(LTO_RANLIB NAMES "${CMAKE_C_COMPILER}-ranlib" gcc-ranlib)
     16 
     17     if (NOT LTO_AR OR NOT LTO_RANLIB)
     18         return()
     19     endif()
     20 
     21     EXECUTE_PROCESS(COMMAND "${LTO_AR}" --version RESULT_VARIABLE ret OUTPUT_QUIET ERROR_QUIET)
     22     if (ret)
     23         return()
     24     endif()
     25 
     26     EXECUTE_PROCESS(COMMAND "${LTO_RANLIB}" --version RESULT_VARIABLE ret OUTPUT_QUIET ERROR_QUIET)
     27     if (ret)
     28         return()
     29     endif()
     30 
     31     set(LTO_WORKS TRUE CACHE INTERNAL "LTO works")
     32 endfunction()
     33