From 6215c6227e788c7c13d5d83d469e5b0019a0f1af Mon Sep 17 00:00:00 2001 From: Xerxes Ranby Date: Fri, 17 Jul 2009 19:22:41 +0000 Subject: 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 --- cmake/modules/CheckAtomic.cmake | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 cmake/modules/CheckAtomic.cmake (limited to 'cmake/modules') 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() -- cgit v1.1