Add a monstrous hack to improve X86ISelDAGToDAG compile time.

 - Force NDEBUG on in any Release build. This drops the compile time to ~100s
   from ~600s, in Release mode.

 - This may just be a temporary workaround, I don't know the true nature of the
   gcc-4.2 compile time performance problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86695 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index 80cf386..2608365 100644 (file)
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -12,6 +12,14 @@
 //
 //===----------------------------------------------------------------------===//
 
+// Force NDEBUG on in any optimized build on Darwin.
+//
+// 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)
+#define NDEBUG
+#endif
+
 #define DEBUG_TYPE "x86-isel"
 #include "X86.h"
 #include "X86InstrBuilder.h"