From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 339143948829; Tue, 20 Apr 2021 18:52:20 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 339143948829
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/82584] div by zero in random distribution
Date: Tue, 20 Apr 2021 18:52:20 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 8.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: redi at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.3
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-82584-4-FN5ffXb57k@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-82584-4@http.gcc.gnu.org/bugzilla/>
References: <bug-82584-4@http.gcc.gnu.org/bugzilla/>
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-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Tue, 20 Apr 2021 18:52:20 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D82584

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-9 branch has been updated by Jonathan Wakely
<redi@gcc.gnu.org>:

https://gcc.gnu.org/g:31a5cc60428b968c9ff3f505fcd1a5ef5c0083bb

commit r9-9369-g31a5cc60428b968c9ff3f505fcd1a5ef5c0083bb
Author: Jonathan Wakely <jwakely@redhat.com>
Date:   Thu Oct 8 15:14:58 2020 +0100

    libstdc++: Add assertions for preconditions in sampling distributions [=
PR
82584]

    These three distributions all require 0 < S where S is the sum of the
    weights. When the sum is zero there's an undefined FP division by zero.
    Add assertions to help users diagnose the problem.

    libstdc++-v3/ChangeLog:

            PR libstdc++/82584
            * include/bits/random.tcc
            (discrete_distribution::param_type::_M_initialize)
            (piecewise_constant_distribution::param_type::_M_initialize)
            (piecewise_linear_distribution::param_type::_M_initialize):
            Add assertions for positive sums..
            * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
            line.

    (cherry picked from commit b2a96bf9dce41ee777b1669e4a8b4c6df3ff3613)=