| Xerxes Ranby | cdcf979 | 2009-07-17 19:22:41 +0000 | [diff] [blame^] | 1 | # atomic builtins are required for threading support. |
| 2 | |
| 3 | INCLUDE(CheckCXXSourceCompiles) |
| 4 | |
| 5 | CHECK_CXX_SOURCE_COMPILES(" |
| 6 | int main() { |
| 7 | volatile unsigned long val = 1; |
| 8 | __sync_synchronize(); |
| 9 | __sync_val_compare_and_swap(&val, 1, 0); |
| 10 | __sync_add_and_fetch(&val, 1); |
| 11 | __sync_sub_and_fetch(&val, 1); |
| 12 | return 0; |
| 13 | } |
| 14 | " LLVM_MULTITHREADED) |
| 15 | |
| 16 | if( NOT LLVM_MULTITHREADED ) |
| 17 | message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing") |
| 18 | endif() |