From 1c33d023715c8f97857f2b2dc18e413be77c6b84 Mon Sep 17 00:00:00 2001
From: Mike Stump <mrs@apple.com>
Date: Mon, 6 Apr 2009 19:58:11 +0000
Subject: [PATCH] Avoid -O3 on Darwin for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68455 91177308-0d34-0410-b5e6-96231b3b80d8
---
 Makefile.rules | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/Makefile.rules b/Makefile.rules
index a8af0b7e73b..e6c266af7f4 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -229,10 +229,12 @@ endif
 CPP.Defines :=
 # OPTIMIZE_OPTION - The optimization level option we want to build LLVM with
 # this can be overridden on the make command line.
-ifneq ($(OS),MingW)
-  OPTIMIZE_OPTION := -O3
-else
+# Avoid -O3 on Darwin, there are unresolved issues with
+# -fstrict-aliasing and ipa-type-escape radr://6756684
+ifeq ($(OS), $(filter $(OS), MingW Darwin))
   OPTIMIZE_OPTION := -O2
+else
+  OPTIMIZE_OPTION := -O3
 endif
 
 ifdef ENABLE_PROFILING
-- 
2.34.1