From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 977C2385841A; Fri, 23 Sep 2022 11:32:24 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 977C2385841A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1663932744; bh=cctXNR382FQHB68DxXZ0cuXFSxTSY5oEgL1bIBp0FYY=; h=From:To:Subject:Date:In-Reply-To:References:From; b=enER09hwN0e8k89I2N0/aTgM/1zkX0VAeo4fAQgFjqWMN7DifNxPKKaBBaTErVC4I kp3ehsonxbCCg4ic6TMIcmwgZ8qc4AiKydGGuEO+ulJSDQTYPD9WTG8WNuWj9qVxeC WZJq9l+r9+73I/1btcwlHhE++koRBlNTDQoUuBIE= From: "redi at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/107015] __debug::bitset has different ABI for -std=c++98 Date: Fri, 23 Sep 2022 11:32:24 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: libstdc++ X-Bugzilla-Version: 12.2.1 X-Bugzilla-Keywords: ABI X-Bugzilla-Severity: normal X-Bugzilla-Who: redi 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107015 --- Comment #1 from Jonathan Wakely --- In C++11 and later (when bitset::reference doesn't use the debug mode iterator validity checks) the only benefit to __debug::bitset is that we ch= eck the argument to operator[] is in range, using __glibcxx_check_subscript. Bu= t we could just move that into std::bitset anyway. It's a cheap check that is enabled with _GLIBCXX_ASSERTIONS.=