From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-486403-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 89523 invoked by alias); 16 May 2015 05:37:32 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 89468 invoked by uid 48); 16 May 2015 05:37:23 -0000
From: "eleventen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/66172] New: -fno-threadsafe-statics suppresses guard functions but not guard variables
Date: Sat, 16 May 2015 05:37:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.2
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: eleventen at gmail 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: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone
Message-ID: <bug-66172-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2015-05/txt/msg01243.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66172

            Bug ID: 66172
           Summary: -fno-threadsafe-statics suppresses guard functions but
                    not guard variables
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eleventen at gmail dot com
  Target Milestone: ---

The use of the -fno-threadsafe-statics eliminates the function references to
the guard functions,

__cxa_guard_acquire
__cxa_guard_release


but it doesn't eliminate the variables used to guard the initialization.  A
compiled version of the attached file using the g++ command line therein
generated no references to the guard functions, but the guard variable remains.

# nm -C guard | grep guard
0000000000600a88 b guard variable for f()::a

--- Comment #1 from Marc Singer <eleventen at gmail dot com> ---
I neglected to include the version information:

# g++ --version
g++ (Debian 4.9.2-10) 4.9.2