From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-404916-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 26191 invoked by alias); 27 Oct 2012 19:48:41 -0000
Received: (qmail 26173 invoked by uid 48); 27 Oct 2012 19:48:26 -0000
From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/55077] implement and enable by default -Wliteral-conversion
Date: Sat, 27 Oct 2012 19:48:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: enhancement
X-Bugzilla-Who: manu at gcc dot gnu.org
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:
Message-ID: <bug-55077-4-yx8OWbAoRZ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-55077-4@http.gcc.gnu.org/bugzilla/>
References: <bug-55077-4@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: 2012-10/txt/msg02592.txt.bz2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D55077

--- Comment #1 from Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez <manu at gcc dot gnu=
.org> 2012-10-27 19:48:25 UTC ---
Problem: We do not want to warn for expressions. From the clang testcases:

  // Expressions, such as those that indicate rounding-down, should NOT pro=
duce
warnings.
  int x =3D 24 * 0.5;
  int y =3D (24*60*60) * 0.25;
  int pennies =3D 123.45 * 100;

But gcc folds those before conversion_warning, so we cannot know they are
expressions... :-(