[Bug string/25399] undefined reference to `__warn_memset_zero_len' when changing gnuc version

["fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=25399

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.33

--- Comment #5 from Florian Weimer <fweimer at redhat dot com> ---
Fixed by:

commit dc274b141666766b8ef70992d887e3c0c5e41bed
Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
Date:   Tue Nov 3 15:09:28 2020 +0530

    Remove __warn_memset_zero_len [BZ #25399]

    Non-gcc compilers (clang and possibly other compilers that do not
    masquerade as gcc 5.0 or later) are unable to use
    __warn_memset_zero_len since the symbol is no longer available on
    glibc built with gcc 5.0 or later.  While it was likely an oversight
    that caused this omission, the fact that it wasn't noticed until
    recently (when clang closed the gap on _FORTIFY_SUPPORT) that the
    symbol was missing.

    Given that both gcc and clang are capable of doing this check in the
    compiler, drop all remaining signs of __warn_memset_zero_len from
    glibc so that no more objects are built with this symbol in future.

We should consider backports.

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