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 3566D3840C2A; Wed,  5 Aug 2020 18:13:14 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3566D3840C2A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1596651194;
 bh=bzRI6dbxDK7gL+f6jaCQ6Ad/jVyWalbmoHA1K2J+9Vg=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=tcJIePJbgKO+1opDaekjkWPdaehmOyUjr0sji4AY1ecgEuSn46sW7O+Ctm1KvBq2e
 sQj3vymlgqqB0LGcxCHK3Y3nP8ar0N0RjUzhBpRmsMnybKU+NcS4ECcWbwlY7j8BS5
 o5UiY4KcJviqQvZCt/4+sfeyQqWooimctIF/ROLg=
From: "s_gccbugzilla at nedprod dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/96485] Lambda parsing regression in GCCs 9 and onwards
Date: Wed, 05 Aug 2020 18:13:14 +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: unknown
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: s_gccbugzilla at nedprod dot com
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: <bug-96485-4-qxuYMzg3t7@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96485-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96485-4@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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 05 Aug 2020 18:13:14 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96485

--- Comment #3 from Niall Douglas <s_gccbugzilla at nedprod dot com> ---
(In reply to Jakub Jelinek from comment #2)
> [[gnu::no_sanitize_undefined]] instead of the GNU __attribute__ is accept=
ed,
> but as the C++ specification requires it applies to the type not the
> declaration and therefore it is ignored.

Obviously the above is an extract from production code. We were using lambd=
as
to wrap individual bits of unsafe code which trips the UB sanitiser. It wou=
ld
be useful to retain that ability, as having to sprinkle the code with:

struct { auto operator()(auto...) const __attribute__((no_sanitize_undefine=
d))
{ } }()(...);=20

... seems retrograde.=