From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 294843858001; Tue, 13 Oct 2020 03:36:39 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 294843858001 From: "eggert at gnu dot org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c/97370] comedy of boolean errors for '!a & (b|c)' Date: Tue, 13 Oct 2020 03:36:39 +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: 10.2.0 X-Bugzilla-Keywords: diagnostic X-Bugzilla-Severity: normal X-Bugzilla-Who: eggert at gnu dot 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: 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: Tue, 13 Oct 2020 03:36:39 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97370 Paul Eggert changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |eggert at gnu dot org --- Comment #4 from Paul Eggert --- (In reply to Harald van Dijk from comment #3) > Perhaps the warning could be suppressed specifically for boolean variable= s, > since those make it more likely that the (!a) & b meaning is exactly what= is > intended? Yes, that's the idea. When a and b are booleans, !a & b has just one sensib= le interpretation, and people are no more likely to get it wrong than to get -= a + b wrong. This distinguishes this case from the one discussed in PR 7543.=