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From: "fw 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 13:34:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108969

--- Comment #6 from Florian Weimer <fw at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #2)
> --- a/libstdc++-v3/src/c++98/globals_io.cc
> +++ b/libstdc++-v3/src/c++98/globals_io.cc
> @@ -43,6 +43,12 @@
>  // In macro form:
>  // _GLIBCXX_ASM_SYMVER(currentname, oldname, GLIBCXX_3.2)
>=20=20
> +#if __has_attribute(symver) && !_GLIBCXX_INLINE_VERSION
> +# define SYMVER(sym) __attribute__((symver(#sym "@@GLIBCXX_3.4.31")))
> +#else
> +# define SYMVER(sym)
> +#endif

Is there anything that prevents these symbol versions getting added for
libstdc++.a? I think that could be problematic because a custom DSO typical=
ly
will not have a version node for GLIBCXX_3.4.31.=