From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 814C638515DC; Tue, 30 Mar 2021 06:47:07 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 814C638515DC From: "alexander.lelyakin at googlemail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/99427] [modules] in system headers: non-constant condition for static assertion Date: Tue, 30 Mar 2021 06:47:07 +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: 11.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: alexander.lelyakin at googlemail dot com X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: nathan 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: Tue, 30 Mar 2021 06:47:07 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99427 --- Comment #3 from Alexander Lelyakin --- There is a shorter sequence: /usr/local/bin/g++ -std=3Dc++20 -fmodules-ts -x c++-system-header string_vi= ew /usr/local/bin/g++ -std=3Dc++20 -fmodules-ts -x c++-system-header ios /usr/local/bin/g++ -std=3Dc++20 -fmodules-ts -x c++-system-header ccomplex ---- In file included from /usr/local/include/c++/11.0.1/sstream:38, from /usr/local/include/c++/11.0.1/complex:45, from /usr/local/include/c++/11.0.1/ccomplex:39: /usr/local/include/c++/11.0.1/istream: In function =E2=80=98std::basic_istr= eam<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT (&)[_Num])=E2=80=99: /usr/local/include/c++/11.0.1/istream:840:26: error: non-constant condition= for static assertion 840 | static_assert(_Num <=3D __gnu_cxx::__numeric_traits::__max); |=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /usr/local/include/c++/11.0.1/istream:840:26: error: the value of =E2=80=98__gnu_cxx::__numeric_traits_integer::__max=E2=80=99 is n= ot usable in a constant expression In file included from /usr/local/include/c++/11.0.1/bits/stl_algobase.h:63, from /usr/local/include/c++/11.0.1/bits/char_traits.h:39, from /usr/local/include/c++/11.0.1/string_view:41, of module /usr/local/include/c++/11.0.1/string_view, imported at /usr/local/include/c++/11.0.1/bits/basic_string.h:48, included from /usr/local/include/c++/11.0.1/string:55, from /usr/local/include/c++/11.0.1/bits/locale_classes.h:4= 0, from /usr/local/include/c++/11.0.1/bits/ios_base.h:41, from /usr/local/include/c++/11.0.1/ios:42, of module /usr/local/include/c++/11.0.1/ios, imported at /usr/local/include/c++/11.0.1/istream:38, included from /usr/local/include/c++/11.0.1/sstream:38, from /usr/local/include/c++/11.0.1/complex:45, from /usr/local/include/c++/11.0.1/ccomplex:39: /usr/local/include/c++/11.0.1/ext/numeric_traits.h:75:27: note: =E2=80=98__gnu_cxx::__numeric_traits_integer::__max=E2=80=99 was = not initialized with a constant expression 75 | static const _Value __max =3D __is_signed | ^~~~~ /usr/local/include/c++/11.0.1/ccomplex: At global scope: /usr/local/include/c++/11.0.1/ccomplex: warning: not writing module =E2=80=98/usr/local/include/c++/11.0.1/ccomplex=E2=80=99 due to errors ---- g++ (GCC) 11.0.1 20210329 (experimental) Copyright (C) 2021 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.=