From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 41450 invoked by alias); 24 Sep 2015 07:06:56 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 41420 invoked by uid 48); 24 Sep 2015 07:06:53 -0000 From: "manu at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/67661] Wrong warning when declare VLAs: operation on 'x' may be undefined [-Wsequence-point] Date: Thu, 24 Sep 2015 07:06:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 5.2.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: manu at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-09/txt/msg01923.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D67661 Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |manu at gcc dot gnu.org --- Comment #3 from Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez --- int main (void) { int x =3D 0, y [++ x], z [++ x]; __builtin_printf ("%d, %d, %d\n", sizeof x, sizeof y, sizeof z); return 0; } $ cc1 -Wsequence-point test.c test.c:3:27: warning: operation on =E2=80=98x=E2=80=99 may be undefined [-W= sequence-point] int x =3D 0, y [++ x], z [++ x]; ^ I'll let someone else with more knowledge of the standard to decide if the warning is correct or not. >>From gcc-bugs-return-497946-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 24 07:25:11 2015 Return-Path: Delivered-To: listarch-gcc-bugs@gcc.gnu.org Received: (qmail 34658 invoked by alias); 24 Sep 2015 07:25:11 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Delivered-To: mailing list gcc-bugs@gcc.gnu.org Received: (qmail 34598 invoked by uid 48); 24 Sep 2015 07:25:07 -0000 From: "mpolacek at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/67661] Wrong warning when declare VLAs: operation on 'x' may be undefined [-Wsequence-point] Date: Thu, 24 Sep 2015 07:25:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c X-Bugzilla-Version: 5.2.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: mpolacek at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-09/txt/msg01924.txt.bz2 Content-length: 440 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67661 Marek Polacek changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mpolacek at gcc dot gnu.org --- Comment #4 from Marek Polacek --- I think the warning is bogus and the code looks valid.