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 115AA385740F; Sat, 18 Jun 2022 14:02:09 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 115AA385740F
From: "matt at godbolt dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/106020] Spurious warnings about stringop
 overflows only with LTO
Date: Sat, 18 Jun 2022 14:02:08 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 12.1.0
X-Bugzilla-Keywords: diagnostic, lto
X-Bugzilla-Severity: normal
X-Bugzilla-Who: matt at godbolt dot 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: 
Message-ID: <bug-106020-4-8FgrR2zraE@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106020-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106020-4@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: Sat, 18 Jun 2022 14:02:09 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106020

--- Comment #6 from Matt Godbolt <matt at godbolt dot org> ---
I'm afraid to say I've been unable to make a repro case in the short time I=
 had
to try - will get back to this but about to go on vacation (!). That's to s=
ay
dumping the files from CE and using:

CXX=3D/opt/compiler-explorer/gcc-12.1.0/bin/g++
CXXFLAGS=3D-O3 -flto -fno-fat-lto-objects -fPIC
app: main.o date.o
        $(CXX) $(CXXFLAGS) -o app date.o main.o
main.o:
        $(CXX) $(CXXFLAGS) -o main.o -c main.cpp
date.o:
        $(CXX) $(CXXFLAGS) -o date.o -c date.cpp
clean:
        rm -f app main.o date.o

did _not_ cause the problem, so there's something else going on. Again, will
try and get to this later, but apologies for the "hit and run" bug report :=
(=