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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++/108969] New: [13 Regression] Initializing iostreams
 in the library needs a GLIBCXX_3.4.31 versioned symbol
Date: Tue, 28 Feb 2023 13:08:29 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ABI
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108969

            Bug ID: 108969
           Summary: [13 Regression] Initializing iostreams in the library
                    needs a GLIBCXX_3.4.31 versioned symbol
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ABI
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: redi at gcc dot gnu.org
  Target Milestone: ---

The fix for PR 44952 is an ABI change because code compiled with GCC 13 rel=
ies
on the init happening once in the library. If a binary compiled with GCC 13
uses libstdc++.so.6.0.30 at runtime then it will segfault when trying to use
the streams. Even though this scenario is unsupported, it would be much bet=
ter
to get an error from ld.so=