GNU logs - #64811, boring messages

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Subject: bug#64811: Win-version now broken
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Hello Paul,

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).

Just a FYI.

CC: Bruno.

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To: Gisle Vanem <gvanem@HIDDEN>
Subject: bug#64811: Acknowledgement (Win-version now broken)
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Subject: bug#64811: Win-version now broken
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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].

Bruno

[1] https://www.gnu.org/software/gnulib/manual/html_node/fstatat.html
[2] https://www.gnu.org/software/gnulib/manual/html_node/openat.html

Message sent to bug-diffutils@HIDDEN:

Subject: bug#64811: Win-version now broken
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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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