From eb4d7c3fceed6c6e4151489c0572cff36500db78 Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Fri, 15 Nov 2013 15:39:14 +0000
Subject: Using an invalid -O falls back on -O3 instead of an error

Summary:
Currently with clang:
$ clang -O20 foo.c
error: invalid value '20' in '-O20'

With the patch:
$ clang -O20 foo.c
warning: optimization level '-O20' is unsupported; using '-O3' instead.
1 warning generated.

This matches the gcc behavior (with a warning added)

Pass all tests:
Testing: 0 .. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90..
Testing Time: 94.14s
  Expected Passes    : 6721
  Expected Failures  : 20
  Unsupported Tests  : 17

(which was not the case of http://llvm-reviews.chandlerc.com/D2125)

Reviewers: chandlerc, rafael, rengolin, hfinkel

Reviewed By: rengolin

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2152

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@194817 91177308-0d34-0410-b5e6-96231b3b80d8
---
 docs/ReleaseNotes.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'docs/ReleaseNotes.rst')

diff --git a/docs/ReleaseNotes.rst b/docs/ReleaseNotes.rst
index 7d63744bdf..597d48142f 100644
--- a/docs/ReleaseNotes.rst
+++ b/docs/ReleaseNotes.rst
@@ -77,7 +77,8 @@ New Compiler Flags
 
 - Clang no longer special cases -O4 to enable lto. Explicitly pass -flto to
   enable it.
-- Command line "clang -O3 -flto a.c -c" and "clang -emit-llvm a.c -c" 
+- Clang no longer fails on >= -O5. Uses -O3 instead.
+- Command line "clang -O3 -flto a.c -c" and "clang -emit-llvm a.c -c"
   are no longer equivalent.
 - Clang now errors on unknown -m flags (``-munknown-to-clang``),
   unknown -f flags (``-funknown-to-clang``) and unknown
-- 
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