From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-413795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 23704 invoked by alias); 31 Jan 2013 18:04:31 -0000
Received: (qmail 22313 invoked by uid 48); 31 Jan 2013 18:03:09 -0000
From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/51544] uninitialized variable false positive prevents bootstrap with -fipa-cp-clone
Date: Thu, 31 Jan 2013 18:04:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dcb314 at hotmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields: CC
Message-ID: <bug-51544-4-ZZvwe0gNeN@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-51544-4@http.gcc.gnu.org/bugzilla/>
References: <bug-51544-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2013-01/txt/msg02914.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51544

David Binderman <dcb314 at hotmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> 2013-01-31 =
18:03:04 UTC ---
I think I may be seeing something similar.

I've been trying to bootstrap using "-g -O3" in BOOT_CFLAGS.=20
That doesn't work, but "-g -O2" of course does.

After trying out all the flags individually that
make the difference from -O2 to -O3, it is the -fipa-cp-clone
flag that is the only one that breaks bootstrap. The rest of=20
the flags are fine.

On trunk snapshot of 20130130, I get

../../src/trunk/gcc/c/c-parser.c: In function =E2=80=98c_expr
c_parser_postfix_expression_after_primary(c_parser*, location_t, c_expr)=E2=
=80=99:
../../src/trunk/gcc/c/c-parser.c:6908:16: error: =E2=80=98origtypes=E2=80=
=99 may be used
uninitialized in this function [-Werror=3Dmaybe-uninitialized]
       origtypes);
                ^
This looks a false positive to me.