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| author | Xerxes Ranby <xerxes@zafena.se> | 2009-07-17 19:22:41 +0000 |
|---|---|---|
| committer | Xerxes Ranby <xerxes@zafena.se> | 2009-07-17 19:22:41 +0000 |
| commit | 6215c6227e788c7c13d5d83d469e5b0019a0f1af (patch) | |
| tree | 661605be3062b23c92bb284d4170f09335b6314b /cmake/modules/CheckAtomic.cmake | |
| parent | d8aa9fc06274604eae2b5156045a71857a8f18c4 (diff) | |
| download | external_llvm-6215c6227e788c7c13d5d83d469e5b0019a0f1af.zip external_llvm-6215c6227e788c7c13d5d83d469e5b0019a0f1af.tar.gz external_llvm-6215c6227e788c7c13d5d83d469e5b0019a0f1af.tar.bz2 | |
Implement cmake LLVM_MULTITHREADED gcc atomic builtin checks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76221 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'cmake/modules/CheckAtomic.cmake')
| -rw-r--r-- | cmake/modules/CheckAtomic.cmake | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/cmake/modules/CheckAtomic.cmake b/cmake/modules/CheckAtomic.cmake new file mode 100644 index 0000000..27bbaba --- /dev/null +++ b/cmake/modules/CheckAtomic.cmake @@ -0,0 +1,18 @@ +# atomic builtins are required for threading support. + +INCLUDE(CheckCXXSourceCompiles) + +CHECK_CXX_SOURCE_COMPILES(" +int main() { + volatile unsigned long val = 1; + __sync_synchronize(); + __sync_val_compare_and_swap(&val, 1, 0); + __sync_add_and_fetch(&val, 1); + __sync_sub_and_fetch(&val, 1); + return 0; + } +" LLVM_MULTITHREADED) + +if( NOT LLVM_MULTITHREADED ) + message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing") +endif() |