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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/108969] [13 Regression] Initializing iostreams in the
 library needs a GLIBCXX_3.4.31 versioned symbol
Date: Tue, 28 Feb 2023 13:51:44 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108969

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #7)
> I think they're exported correctly with both versions:
>=20
> $ nm -D  --defined-only  src/.libs/libstdc++.so.6.0.31 | grep '_ZSt[345]c'
> 000000000025d7a0 B _ZSt3cin@@GLIBCXX_3.4
> 000000000025d7a0 B _ZSt3cin@@GLIBCXX_3.4.31
> 000000000025d560 B _ZSt4cerr@@GLIBCXX_3.4
> 000000000025d560 B _ZSt4cerr@@GLIBCXX_3.4.31
> 000000000025d440 B _ZSt4clog@@GLIBCXX_3.4
> 000000000025d440 B _ZSt4clog@@GLIBCXX_3.4.31
> 000000000025d680 B _ZSt4cout@@GLIBCXX_3.4.31
> 000000000025d680 B _ZSt4cout@@GLIBCXX_3.4

Note, the GLIBCXX_3.4 ones should be @, not @@.

> But Florian's right, they're in the .a too.

Unfortunately we build libstdc++ objects just once because even libstdc++.a
contains -fPIC code.  So not sure how to arrange it to be libstdc++.so only=
.=