From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 00A4C3857011; Thu, 16 Sep 2021 22:11:28 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 00A4C3857011 From: "msebor at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/102378] missing -Waddress in template code at definition time rather than instantiation Date: Thu, 16 Sep 2021 22:11:27 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: enhancement X-Bugzilla-Who: msebor at gcc dot gnu.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: 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: Thu, 16 Sep 2021 22:11:28 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102378 --- Comment #3 from Martin Sebor --- With the correct explicit instantiation directive things look much better: $ cat pr102378.C && gcc -S -Wall pr102378.C int f () { int a[2]; return &a =3D=3D 0; // -Waddress (good) } template int g () { { int a[2]; return &a =3D=3D 0; // missing -Waddress } { T t; return &t =3D=3D 0; // no -Waddress for type-dependent expr (good) } { T a[2]; return &a =3D=3D 0; // missing -Waddress } } template int h () { { int a[2]; return &a =3D=3D 0; // -Waddress (good) } { T t; return &t =3D=3D 0; // -Waddress (good) } { T a[2]; return &a =3D=3D 0; // -Waddress (good) } } template int h (); pr102378.C: In function =E2=80=98int f()=E2=80=99: pr102378.C:4:13: warning: the address of =E2=80=98a=E2=80=99 will never be = NULL [-Waddress] 4 | return &a =3D=3D 0; // -Waddress (good) | ~~~^~~~ pr102378.C: In instantiation of =E2=80=98int h() [with T =3D int]=E2=80=99: pr102378.C:45:22: required from here pr102378.C:31:15: warning: the address of =E2=80=98a=E2=80=99 will never be= NULL [-Waddress] 31 | return &a =3D=3D 0; // -Waddress (good) | ~~~^~~~ pr102378.C:36:15: warning: the address of =E2=80=98t=E2=80=99 will never be= NULL [-Waddress] 36 | return &t =3D=3D 0; // -Waddress (good) | ~~~^~~~ pr102378.C:41:15: warning: the address of =E2=80=98a=E2=80=99 will never be= NULL [-Waddress] 41 | return &a =3D=3D 0; // -Waddress (good) | ~~~^~~~=