Speculative fix for Windows build after r220932

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220936 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Support/Windows/Threading.inc b/lib/Support/Windows/Threading.inc
index 099c6b2..41fdd98 100644 (file)
--- a/lib/Support/Windows/Threading.inc
+++ b/lib/Support/Windows/Threading.inc
@@ -1,5 +1,10 @@
 #include <winbase.h>
 
+#ifdef MemoryFence
+// WinNT.h seems to define a MemoryFence macro.
+#undef MemoryFence
+#endif
+
 void llvm::call_once(once_flag &flag, void (*fptr)(void)) {
   while (flag != Done) {
     if (flag == Wait) {