From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <segher@kernel.crashing.org>
Received: from gate.crashing.org (gate.crashing.org [63.228.1.57])
 by sourceware.org (Postfix) with ESMTP id 4215B3858406
 for <gcc-help@gcc.gnu.org>; Wed, 23 Feb 2022 00:33:54 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 4215B3858406
Authentication-Results: sourceware.org; dmarc=none (p=none dis=none)
 header.from=kernel.crashing.org
Authentication-Results: sourceware.org;
 spf=pass smtp.mailfrom=kernel.crashing.org
Received: from gate.crashing.org (localhost.localdomain [127.0.0.1])
 by gate.crashing.org (8.14.1/8.14.1) with ESMTP id 21N0Wrna018942;
 Tue, 22 Feb 2022 18:32:53 -0600
Received: (from segher@localhost)
 by gate.crashing.org (8.14.1/8.14.1/Submit) id 21N0WrNQ018941;
 Tue, 22 Feb 2022 18:32:53 -0600
X-Authentication-Warning: gate.crashing.org: segher set sender to
 segher@kernel.crashing.org using -f
Date: Tue, 22 Feb 2022 18:32:53 -0600
From: Segher Boessenkool <segher@kernel.crashing.org>
To: Krishna Narayanan <krishnanarayanan132002@gmail.com>
Cc: Jonathan Wakely <jwakely.gcc@gmail.com>, gcc-help <gcc-help@gcc.gnu.org>
Subject: Re: Doubt regarding dg-directives
Message-ID: <20220223003253.GC614@gate.crashing.org>
References: <CABhGnjtKJ5q5dwfA7B4nQui26HmQNekXbQ5XjXEK6m=1S-zetQ@mail.gmail.com>
 <CAH6eHdS7wxLm=kyne=JO3HAd7bxnu6QeBaWaeTtZm-8QSP6fnQ@mail.gmail.com>
 <CAH6eHdTarL-tB0PsZ3JWyoKDCzdDcbDVUZWZ0sPjc+qQsMWXKA@mail.gmail.com>
 <CABhGnjtsuKD=RzaQkuo2W2ozGjJCO1iU510B=CMJDebY5wX24w@mail.gmail.com>
 <20220222154432.GV614@gate.crashing.org>
 <CABhGnjtWdGCoV_ySUmaPMKRdcFdasta9UfQYGLRN2AVSjEgr_w@mail.gmail.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CABhGnjtWdGCoV_ySUmaPMKRdcFdasta9UfQYGLRN2AVSjEgr_w@mail.gmail.com>
User-Agent: Mutt/1.4.2.3i
X-Spam-Status: No, score=-3.3 required=5.0 tests=BAYES_00, JMQ_SPF_NEUTRAL,
 KAM_DMARC_STATUS, SPF_HELO_PASS, SPF_PASS, TXREP,
 T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.4
X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
 server2.sourceware.org
X-BeenThere: gcc-help@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-help mailing list <gcc-help.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-help/>
List-Post: <mailto:gcc-help@gcc.gnu.org>
List-Help: <mailto:gcc-help-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-help>,
 <mailto:gcc-help-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 23 Feb 2022 00:33:55 -0000

On Wed, Feb 23, 2022 at 12:00:47AM +0530, Krishna Narayanan wrote:
> On Tue, Feb 22, 2022 at 9:16 PM Segher Boessenkool
> <segher@kernel.crashing.org> wrote:
> >
> > On Tue, Feb 22, 2022 at 09:08:40PM +0530, Krishna Narayanan via Gcc-help wrote:
> > > Yes, it does.
> > > I used dg-warning and not dg warning (that was a sheer typing mistake).
> > > The warning is about the uninitialized variable being used in the
> > > testcase yet there is no warning on that line and the test results in
> > > FAIL.
> > > I used /* { dg-warning "uninitialized" } */ on that particular line.I
> > > used the test in gcc.dg, with other directive /* { dg-options "-O2" }
> > > */ .
> > > Can you help me where I went wrong?
> >
> > Please send the verbatim testcase (and don't top-post please).  Guessing
> > is a fun game sometimes, but more often it is just frustrating.
> /* { dg-do compile } */
> /* { dg-options "-O2" } */
>  int test(int y) {
>     int z;
>     int x;
>     int a;
>     for (x = 0; x < 10; x = x + 1, y = y + 1,a = a + 1)
>     {
>         if (y < 10) {
>             z = z + 1 + a; /* { dg-warning "uninitialized" } */
>         }
>     }
>     return z;
> }

Thanks.  As Jonathan said, you need to enable this warning in the
options, the testsuite does not enable more warnings than GCC does
itself.


Segher