bug#73444: 30.0.50; mingw-w64: Emacs uses CRT's `read` when _FORTIFY_SOURCE > 0

[Óscar Fuentes]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Óscar Fuentes <ofv@wanadoo.es>
>> Date: Tue, 24 Sep 2024 00:29:37 +0200
>> 
>> BTW, #63752 was filed about the observable problems when Emacs is built
>> with _FORTIFY_SOURCE on mingw-w64, which documents an ensuing effort to
>> try to identify the cause, unsuccessfully.
>
> I don't think I follow.  Are you saying that these two bugs should be
> merged, because solving this problem with 'read' solves also the
> problems reported in bug#63752?  Or are there other problems with
> _FORTIFY_SOURCE that are still left unresolved if the issue with
> 'read' is fixed?

#63752 describes the simptons and tries to identify the cause, this bug
(#73444) provides the cause and discusses a possible fix, hopefully one
that covers the general case and not just `read'.

I was not aware of the existence of #63752 when I created this bug. As
what to do with #63752, I have no preferences.