X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=cmake%2Fmodules%2FCheckAtomic.cmake;h=a03788ec9f93bca00893cdb31fc46b232a3334bc;hb=527745e789d49d6b3d3004d74265d2eb79cf5bd4;hp=f40ff4dfbd3123e4ab3fc29de1ddc3595eed1e43;hpb=c595e6ca0a889ab51efe7a1c8109f8e96d9d4869;p=oota-llvm.git

diff --git a/cmake/modules/CheckAtomic.cmake b/cmake/modules/CheckAtomic.cmake
index f40ff4dfbd3..a03788ec9f9 100644
--- a/cmake/modules/CheckAtomic.cmake
+++ b/cmake/modules/CheckAtomic.cmake
@@ -2,8 +2,18 @@
 
 INCLUDE(CheckCXXSourceCompiles)
 
+check_function_exists(__atomic_fetch_add_4 HAVE___ATOMIC_FETCH_ADD_4)
+if( NOT HAVE___ATOMIC_FETCH_ADD_4 )
+  check_library_exists(atomic __atomic_fetch_add_4 "" HAVE_LIBATOMIC)
+  set(HAVE_LIBATOMIC False)
+  if( HAVE_LIBATOMIC )
+    list(APPEND CMAKE_REQUIRED_LIBRARIES "atomic")
+  endif()
+endif()
+
 CHECK_CXX_SOURCE_COMPILES("
 #ifdef _MSC_VER
+#include <Intrin.h> /* Workaround for PR19898. */
 #include <windows.h>
 #endif
 int main() {
@@ -22,8 +32,8 @@ int main() {
 #endif
         return 0;
       }
-" LLVM_MULTITHREADED)
+" LLVM_HAS_ATOMICS)
 
-if( NOT LLVM_MULTITHREADED )
+if( NOT LLVM_HAS_ATOMICS )
   message(STATUS "Warning: LLVM will be built thread-unsafe because atomic builtins are missing")
 endif()