From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 29138 invoked by alias); 22 Oct 2010 15:30:39 -0000 Received: (qmail 29118 invoked by uid 22791); 22 Oct 2010 15:30:35 -0000 X-SWARE-Spam-Status: No, hits=-2.6 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 22 Oct 2010 15:30:30 +0000 From: "bkoz at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/46134] New: constexpr vs. defaulted ctor X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: bkoz 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: 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 Date: Fri, 22 Oct 2010 15:30:00 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org X-SW-Source: 2010-10/txt/msg01909.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D46134 Summary: constexpr vs. defaulted ctor Product: gcc Version: 4.6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++ AssignedTo: unassigned@gcc.gnu.org ReportedBy: bkoz@gcc.gnu.org Changing std::chrono::duration's default constructor to "default" from an e= mpty body causes a new error. Ie: diff --git a/libstdc++-v3/include/std/chrono b/libstdc++-v3/include/std/chr= ono index bbcb0ff..d346049 100644 --- a/libstdc++-v3/include/std/chrono +++ b/libstdc++-v3/include/std/chrono @@ -209,7 +209,7 @@ namespace std static_assert(_Period::num > 0, "period must be positive"); // 20.8.3.1 construction / copy / destroy - constexpr duration() { } + constexpr duration() =3D default; template::value See attached pre-processed file for simple reproducer. Error message is: In file included from /mnt/share/src/gcc.git-constexpr/libstdc++-v3/testsuite/20_util/duration/co= ns/constexpr.cc:22:0: /mnt/share/src/gcc.git-constexpr/libstdc++-v3/testsuite/util/testsuite_comm= on_types.h: In member function =E2=80=98void __gnu_test::constexpr_default_constructible::operator()()::_Concept::__cons= traint() [with _Tp =3D std::chrono::duration]=E2=80=99: /mnt/share/src/gcc.git-constexpr/libstdc++-v3/testsuite/util/testsuite_comm= on_types.h:629:17: instantiated from =E2=80=98void __gnu_test::constexpr_default_constructible::operator()() [with _Tp =3D std::chrono::duration]=E2=80=99 /mnt/share/src/gcc.git-constexpr/libstdc++-v3/testsuite/20_util/duration/co= ns/constexpr.cc:27:48: instantiated from here /mnt/share/src/gcc.git-constexpr/libstdc++-v3/testsuite/util/testsuite_comm= on_types.h:625:20: error: uninitialized const =E2=80=98__v=E2=80=99 [-fpermissive] /mnt/share/bld/gcc.git-constexpr/x86_64-unknown-linux-gnu/libstdc++-v3/incl= ude/chrono:201:14: note: =E2=80=98const struct std::chrono::duration=E2=80=99 has no= user-provided default constructor /mnt/share/bld/gcc.git-constexpr/x86_64-unknown-linux-gnu/libstdc++-v3/incl= ude/chrono:212:12: note: constructor is not user-provided because it is explicitly defaulted in the class body