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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] [13 Regression] Initializing iostreams in the
 library needs a GLIBCXX_3.4.31 versioned symbol
Date: Tue, 28 Feb 2023 14:09:49 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108969

--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #8)
> 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 on=
ly.

We have a handful of objects which are built without --tag disable-shared in
LTCXXCOMPILE, see src/Makefile.am

So if we use that approach for globals_io.cc then we can check if
_GLIBCXX_SHARED is defined to tell whether we're going into the .so or not.=