From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id 785A53858C54; Thu,  1 Dec 2022 14:51:48 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 785A53858C54
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1669906308;
	bh=Z465NN++e8/1ebv8JwVb5oH9fhOD7PkrshWc3UH/x00=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=b/nQld/DZUxyEQc1VvDq376QoVF7nYmpiH9zB73bSmVZpSU/ym08y9o8Vn8pRs9dY
	 4zdL3NNgTVQskCkDbVGnBdaXtGqqOAteWySvjtGtOAmQzUkonN1OxNJDIDwVueQuLO
	 M7kcSVh+LwnjFO7lwgzWiLLgKVBK7gJdUTHligQw=
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/107947] __has_c_attribute incorrectly identifies attribute as
 supported
Date: Thu, 01 Dec 2022 14:51:48 +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: 13.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: INVALID
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: <bug-107947-4-6c7byaDNyO@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-107947-4@http.gcc.gnu.org/bugzilla/>
References: <bug-107947-4@http.gcc.gnu.org/bugzilla/>
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: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107947

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to WANG Xuerui from comment #0)
> I haven't bisected yet but can help doing so if necessary.

Bisection shows that it changed with r13-2976 which is the commit that added
support for the [[noreturn]] attribute. So it's totally correct that
__has_c_attribute starts to be non-zero then, because it started to be
supported then.

    c: C2x noreturn attribute

    C2x adds a standard [[noreturn]] attribute (which can also be spelt
    [[_Noreturn]] for use with <stdnoreturn.h>), so allowing non-returning
    functions to be declared in a manner compatible with C++; the
    _Noreturn function specifier remains available but is marked
    obsolescent.=