diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index 2608365..6a3577a 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -16,7 +16,8 @@
 //
 // FIXME: This is a huge hack, to work around ridiculously awful compile times
 // on this file with gcc-4.2 on Darwin, in Release mode.
-#if defined(__APPLE__) && defined(__OPTIMIZE__) && !defined(NDEBUG)
+#if (!defined(__llvm__) && defined(__APPLE__) && \
+     defined(__OPTIMIZE__) && !defined(NDEBUG))
 #define NDEBUG
 #endif