From 001dea475f2c6cbe535ba7a18f9085fa6990f778 Mon Sep 17 00:00:00 2001
From: "jkummerow@chromium.org"
 <jkummerow@chromium.org@ce2b1a6d-e550-0410-aec6-3dcde31c8c00>
Date: Wed, 18 Jan 2012 10:17:03 +0000
Subject: [PATCH] Provide a switch to specify -fno-strict-aliasing

BUG=v8:1887

Review URL: https://chromiumcodereview.appspot.com/9231019

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10427 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
---
 Makefile          | 4 ++++
 build/common.gypi | 8 +++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 833c875..73e8421 100644
--- a/Makefile
+++ b/Makefile
@@ -87,6 +87,10 @@ endif
 ifeq ($(presubmit), no)
   TESTFLAGS += --no-presubmit
 endif
+# strictaliasing=off (workaround for GCC-4.5)
+ifeq ($(strictaliasing), off)
+  GYPFLAGS += -Dv8_no_strict_aliasing=1
+endif
 
 # ----------------- available targets: --------------------
 # - "dependencies": pulls in external dependencies (currently: GYP)
diff --git a/build/common.gypi b/build/common.gypi
index e372af6..c1c2b42 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -73,6 +73,9 @@
     # Enable profiling support. Only required on Windows.
     'v8_enable_prof%': 0,
 
+    # Some versions of GCC 4.5 seem to need -fno-strict-aliasing.
+    'v8_no_strict_aliasing%': 0,
+
     # Chrome needs this definition unconditionally. For standalone V8 builds,
     # it's handled in build/standalone.gypi.
     'want_separate_host_toolset%': 1,
@@ -227,7 +230,10 @@
             'cflags': [ '-m32' ],
             'ldflags': [ '-m32' ],
           }],
-        ],
+          [ 'v8_no_strict_aliasing==1', {
+            'cflags': [ '-fno-strict-aliasing' ],
+          }],
+        ],  # conditions
       }],
       ['OS=="solaris"', {
         'defines': [ '__C99FEATURES__=1' ],  # isinf() etc.
-- 
2.7.4