From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-488285-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 113302 invoked by alias); 7 Jun 2015 20:13:06 -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 113239 invoked by uid 48); 7 Jun 2015 20:13:03 -0000
From: "dimhen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/66452] New: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not used
Date: Sun, 07 Jun 2015 20:13:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: sanitizer
X-Bugzilla-Version: 6.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: dimhen 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 cc target_milestone
Message-ID: <bug-66452-4@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: 2015-06/txt/msg00617.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66452

            Bug ID: 66452
           Summary: [6 Regression] [UBSAN] *.Lubsan_data0' defined but not
                    used
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dimhen at gmail dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org
  Target Milestone: ---

r224060 PASS
r224193 FAIL

$ g++ -Wall -O0 -fsanitize=undefined -c x.ii -fpreprocessed -o x.o
x.ii: In member function 'A B::m_fn1() const':
x.ii:9:12: warning: unused variable 'i' [-Wunused-variable]
   for (int i;;)
            ^
At global scope:
cc1plus: warning: '*.Lubsan_data0' defined but not used [-Wunused-variable]

$ cat x.ii
class A {
public:
  A(int);
};
class B {
  A m_fn1() const;
};
A B::m_fn1() const {
  for (int i;;)
    ;
  return 0;
}

$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/local/gcc_current/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_current/configure
--prefix=/usr/local/gcc_current --enable-static
--enable-checking=yes,df,fold,rtl --enable-languages=c,c++,lto --enable-plugin
--disable-libstdcxx-dual-abi --disable-multilib
Thread model: posix
gcc version 6.0.0 20150606 (experimental) [trunk revision 224193] (GCC)

$ ~/bin/gcc_224060_rls/bin/g++ -v
Using built-in specs.
COLLECT_GCC=/home/dimhen/bin/gcc_224060_rls/bin/g++
COLLECT_LTO_WRAPPER=/home/dimhen/bin/gcc_224060_rls/bin/../libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/dimhen/src/gcc_r224060/configure
--prefix=/usr/local/gcc_current --enable-static --enable-checking=release
--enable-languages=c,c++,lto --enable-plugin --disable-libstdcxx-dual-abi
--disable-multilib
Thread model: posix
gcc version 6.0.0 20150603 (experimental) [trunk revision 224060] (GCC)