From b306e38a2e00eccb2b6cca176ce71385fb4a77f9 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Mon, 20 Apr 2009 22:16:40 +0000
Subject: [PATCH] One Mac OS X, just build with -O3 but without
 -fstrict-aliasing (which is kinda broken).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69630 91177308-0d34-0410-b5e6-96231b3b80d8
---
 Makefile.rules           | 20 +++++++++++---------
 utils/buildit/build_llvm |  2 +-
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/Makefile.rules b/Makefile.rules
index 192f8870792..9324fe62fba 100644
--- a/Makefile.rules
+++ b/Makefile.rules
@@ -229,12 +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.
-# Avoid -O3 on Darwin, there are unresolved issues with
-# -fstrict-aliasing and ipa-type-escape radr://6756684
-ifeq ($(OS), $(filter $(OS), MingW Darwin))
-  OPTIMIZE_OPTION := -O2
-else
-  OPTIMIZE_OPTION := -O3
+ifndef OPTIMIZE_OPTION
+  ifneq ($(OS),MingW)
+    OPTIMIZE_OPTION := -O3
+  else
+    OPTIMIZE_OPTION := -O2
+  endif
 endif
 
 ifeq ($(ENABLE_OPTIMIZED),1)
@@ -247,9 +247,11 @@ ifeq ($(ENABLE_OPTIMIZED),1)
   endif
 
   # Darwin requires -fstrict-aliasing to be explicitly enabled.
-  ifeq ($(OS),Darwin)
-    EXTRA_OPTIONS += -fstrict-aliasing -Wstrict-aliasing
-  endif
+  # Avoid -O3 on Darwin for now, there are unresolved issues with
+  # -fstrict-aliasing and ipa-type-escape radr://6756684
+  #ifeq ($(OS),Darwin)
+  #  EXTRA_OPTIONS += -fstrict-aliasing -Wstrict-aliasing
+  #endif
   CXX.Flags += $(OPTIMIZE_OPTION) $(OmitFramePointer)
   C.Flags   += $(OPTIMIZE_OPTION) $(OmitFramePointer)
   LD.Flags  += $(OPTIMIZE_OPTION)
diff --git a/utils/buildit/build_llvm b/utils/buildit/build_llvm
index 450bfeaacf9..eac68b4f572 100755
--- a/utils/buildit/build_llvm
+++ b/utils/buildit/build_llvm
@@ -161,7 +161,7 @@ cd $DIR/obj-llvm || exit 1
 make $LOCAL_MAKEFLAGS $OPTIMIZE_OPTS UNIVERSAL=1 UNIVERSAL_ARCH="$TARGETS" \
     LLVM_SUBMIT_VERSION=$LLVM_SUBMIT_VERSION \
     LLVM_SUBMIT_SUBVERSION=$LLVM_SUBMIT_SUBVERSION \
-    OPTIMIZE_OPTION='-O2' VERBOSE=1 install
+    OPTIMIZE_OPTION='-O3' VERBOSE=1 install
 
 if ! test $? == 0 ; then
     echo "error: LLVM 'make install' failed!"
-- 
2.34.1