Unfortunate interaction of glibc-2.44 and gnulib regarding posix_spawn_file_actions_addchdir => infinite recursion

[Collin Funk]

Xi Ruoyao <xry111@xry111.site> writes:

> It can be worked around with
> ac_cv_func_posix_spawn_file_actions_addchdir=yes (which basically tells
> the configure system we have a posix_spawn_file_actions_addchdir, some
> kind of a "fact" with glibc 2.44).
>
> Thoughts on fix this?

Does the attached patch work? In a container, it looks like the symbols
are defined correctly, but I haven't tested it more than that yet:

    $ nm -g --defined-only gllib/libgnu.a | grep spawn_file_actions_add
    0000000000000000 T rpl_posix_spawn_file_actions_addchdir
    0000000000000000 T rpl_posix_spawn_file_actions_addfchdir

Note that I also haven't pushed it yet, since I suspect we will want to
update the outdated commentary to reflect the fact that this is now
standardized. And also consider not compiling these files
unconditionally.

Collin

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