[Bug libstdc++/108969] [13/14 Regression] Initializing iostreams in the library needs a GLIBCXX_3.4.31 versioned symbol

["romain.geissler at amadeus dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108969

Romain Geissler <romain.geissler at amadeus dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |romain.geissler at amadeus dot com

--- Comment #28 from Romain Geissler <romain.geissler at amadeus dot com> ---
Hi,

Sorry to jump here, but I wish to clarify something.

If I understood the commit message/diff correctly, I expect that this commit
will eventually land in the gcc 13 branch, not just in master, right ? So let's
imagine gcc 13.2.0 is released with this, it will mean that a binary (including
<iostream>) built with gcc 13.2.0 won't be runnable with the runtime of gcc
13.1.0 ? If yes, given that you also maintain the gcc package in fedora 38
(https://src.fedoraproject.org/rpms/gcc/commits/f38), does it mean that
something build in some future up to date Fedora 38 won't build on an old
"unpatched" fedora 38 ?

In other words, in general, is there any guarantee that something built using
gcc N.X.0 can be run with the runtime of gcc N.Y.0 for X > Y ? (I am not
speaking about mixing gcc 13 with gcc 12, but point releases of gcc 13).

Cheers,
Romain