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 748C23858C54; Wed, 22 Feb 2023 10:25:44 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 748C23858C54
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1677061544;
	bh=f5AMt75c2Xkj/pIqtDvNEiqk7uW3fs1AIMeB2OJd9E0=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=plZ39UYzgH0dABfo95iswJ47KDklvhBkOP2wea94wziwO42H+Q8AgK5e7Ldsl90ZW
	 b1TUgAO1XuHAbn7KdAMpGzxvoe4ghg5rbW6Kmk9pfGlFko/V6CHlVTYpQbJQ6BntVs
	 s5WHTzWm+ffMPDgqwvQLDcPhkXgNABmHZUb+/0d8=
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/108880] [11/12/13 Regression] slow compilation with
 "-fsanitize=undefined"
Date: Wed, 22 Feb 2023 10:25:43 +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: compile-time-hog
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 11.4
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: bug_status everconfirmed cf_reconfirmed_on version
 component
Message-ID: <bug-108880-4-ZM8c1Qaqeo@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-108880-4@http.gcc.gnu.org/bugzilla/>
References: <bug-108880-4@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=3D108880

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-02-22
            Version|unknown                     |13.0
          Component|sanitizer                   |c

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
It's not only "slow", it also produces a gigantic executable, the .original
dump was 7.1GB when I stopped the compilation ...

The culprit is c_genericize calling c_genericize_control_r which must someh=
ow
do the ubsan instrumentation as well.=