[bug-diffutils] bug#64811: Win-version now broken

[Gisle Vanem]

Bruno Haible wrote:

> Gisle Vanem wrote:
> > since the commit "diff: use openat, fstatat when recursive":
> >     
> > https://git.savannah.gnu.org/cgit/diffutils.git/commit/?id=6bf2c33ea45c20061c13eeefebf2951eab79b61c
> >
> > any '--recursive' option has stopped working on
> > Windows. AFAICS, since the 'openat()' seems unsupported
> > on Windows (accessing '/proc/self/x' and other stuff).
>
> Does it work if you add the modules 'fstatat' and 'openat' to bootstrap.conf?
> These modules are supported on native Windows [1][2].

Off-course, otherwise diff.exe wouldn't have linked.
Would it?

I find that fstatat() + openat() on Windows works bad;
from 'man fstatat'
  If pathname is absolute, then dirfd is ignored.

So in my test:
  diff --recursive <rel-dir-1> <rel-dir-2>

does not work. But a:
  diff --recursive <abs-dir-1> <abs-dir-2>

does work! What could be the cause of this?

Bruno, any GNUlib test for this case?

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--gv