From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 1C94D3857C6B; Fri, 21 Jan 2022 21:32:18 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1C94D3857C6B From: "kim.walisch at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/101831] Spurious maybe-uninitialized warning on std::array::size Date: Fri, 21 Jan 2022 21:32:17 +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: 11.1.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: kim.walisch at gmail dot com X-Bugzilla-Status: NEW 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-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 21 Jan 2022 21:32:18 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101831 kim.walisch at gmail dot com changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kim.walisch at gmail dot c= om --- Comment #2 from kim.walisch at gmail dot com --- > I'm not sure that the std::array use case is common enough to justify the= potential for the false negatives I just hit the same GCC warning on completely valid code. Both Clang & MSVC correctly do not issue any warning. void Foo::func() { std::array pos; assert(pos.size() =3D=3D static_global_array.size()); ... } In member function =E2=80=98void Foo::func()=E2=80=99: warning: =E2=80=98pos=E2=80=99 may be used uninitialized [-Wmaybe-uninitial= ized] 312 | assert(pos.size() =3D=3D buffers_.size());=