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-rw-r--r--indra/llcommon/llfasttimer.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/indra/llcommon/llfasttimer.h b/indra/llcommon/llfasttimer.h
index 645bbb88ff..5058a2e772 100644
--- a/indra/llcommon/llfasttimer.h
+++ b/indra/llcommon/llfasttimer.h
@@ -39,7 +39,13 @@
#define TIME_FAST_TIMERS 0
#if LL_WINDOWS
+// because MS has different signatures for these functions in winnt.h
+// need to rename them to avoid conflicts
+#define _interlockedbittestandset _renamed_interlockedbittestandset
+#define _interlockedbittestandreset _renamed_interlockedbittestandreset
#include <intrin.h>
+#undef _interlockedbittestandset
+#undef _interlockedbittestandreset
#define LL_INLINE __forceinline
// shift off lower 8 bits for lower resolution but longer term timing