| Tomi Valkeinen | 8170f7a | 2016-09-28 10:42:03 +0300 | [diff] [blame] | 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() |