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From: "unlvsur at live dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/108331] New: ABI break of std::__c_file and
 std::fstream for win32 thread model of GCC for windows
Date: Sat, 07 Jan 2023 21:19:05 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.0
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: unlvsur at live dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108331

            Bug ID: 108331
           Summary: ABI break of std::__c_file and std::fstream for win32
                    thread model of GCC for windows
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: unlvsur at live dot com
  Target Milestone: ---

The recent win32 thread model changes cause abi break of std::fstream due to
layout silently change.

I do not understand why you need a mutex for std::fstream. Now win32, posix=
 and
mcf thread model they cause abi issues for this due to that lock. Can we un=
ify
the abi for windows here?=