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 D00783858C39; Thu,  9 Dec 2021 20:59:51 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D00783858C39
From: "js-gcc at webkeks dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug objc/103639] New: [REGRESSION] GCC 11.2 (or even earlier)
 breaks switch case with break in fast enumeration loop
Date: Thu, 09 Dec 2021 20:59:51 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: objc
X-Bugzilla-Version: 11.2.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: js-gcc at webkeks 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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-103639-4@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: Thu, 09 Dec 2021 20:59:51 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103639

            Bug ID: 103639
           Summary: [REGRESSION] GCC 11.2 (or even earlier) breaks switch
                    case with break in fast enumeration loop
           Product: gcc
           Version: 11.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: objc
          Assignee: unassigned at gcc dot gnu.org
          Reporter: js-gcc at webkeks dot org
  Target Milestone: ---

The following code is miscompiled by GCC 11.2.1. I don't know when this
started, but this is a regression and used to work just fine in older versi=
on:

for (id object in someCollection) {
  switch (someVar) {
  case 0:
     puts("0");
     break;
  }
  puts("this should print but doesn't");
}

The break breaks out of the for loop instead of the switch case.

Changing the code to this makes it work:

for (id object in someCollection) {
  if (someVar =3D=3D 0) {
     puts("0");
     break;
  }
  puts("this should print and does");
}

This worked just fine with older GCC versions and also works fine with all
versions of Clang.=