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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/59215] tsan: warning in shared_ptr_base.h
Date: Thu, 21 Nov 2013 14:47:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 4.8.0
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X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Priority: P3
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X-Bugzilla-Target-Milestone: 4.8.3
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59215

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2013-11-21
          Component|sanitizer                   |libstdc++
           Assignee|unassigned at gcc dot gnu.org      |redi at gcc dot gnu.org
   Target Milestone|---                         |4.8.3
     Ever confirmed|0                           |1

--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This should fix it:

--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -233,7 +233,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     _M_add_ref_lock()
     {
       // Perform lock-free add-if-not-zero operation.
-      _Atomic_word __count = _M_use_count;
+      _Atomic_word __count = _M_get_use_count();
       do
        {
          if (__count == 0)

But I can't test it yet because libtsan is giving me undefined references to
sigsetjmp.