GNU bug report logs - #72335
An attempt to fix UCRT64 build failure

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Stefan Kangas <stefankangas <at> gmail.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#72335: closed (An attempt to fix UCRT64 build failure)
Date: Tue, 11 Feb 2025 07:35:02 +0000

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Your message dated Mon, 10 Feb 2025 23:34:17 -0800
with message-id <CADwFkm=r-5ewNcJP=d3vdcpETQyUMvLmQe1G4ZM6o4iReE703g <at> mail.gmail.com>
and subject line Re: bug#72335: An attempt to fix UCRT64 build failure
has caused the debbugs.gnu.org bug report #72335,
regarding An attempt to fix UCRT64 build failure
to be marked as done.

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72335: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=72335
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From: "YI Yue" <include_yy <at> qq.com>
To: "bug-gnu-emacs" <bug-gnu-emacs <at> gnu.org>
Subject: An attempt to fix UCRT64 build failure
Date: Sun, 28 Jul 2024 22:55:48 +0900

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Hello, everyone

I occasionally try to compile Emacs to get the latest commits. But on Windows, I
only use Mingw64 because it's the only one officially supported by Emacs.[1]
When I try to build Emacs in MSYS2/UCRT64, I'll get these outputs:

./temacs --batch  -l loadup --temacs=pbootstrap \
        --bin-dest '/d/user/yy/emacs-build/bin/' --eln-dest '/d/user/yy/emacs-build/lib/emacs/31.0.50/'
D:\user\yy\emacs-master\src\temacs.exe: Write error to standard output: No such file or directory

MSYS2 do provides a patch[2] that do something about function
`close_output_streams' in src/sysdep.c. By applying it, I can get these results:

***
*** "make all" succeeded, but Emacs is not functional.
***

Sometimes I'll check emacs-devel to see if there are any progress in solving
this problem, such as this[3]. Two days ago I saw Pip Cet's "MPS: Win64
testers?"[4] and it inspired me that the problem may come from `init_ntproc' in
src/w32.c. After seeing UCRT's documentation[5], I think maybe we can use
`_fcloseall' instead of `fclose'? By using this, I get no error above when building 
in MSYS2/UCRT64.

I have little knowledge of MSVCRT and UCRT, it just works :)

Here is my patch, regards.

[1]: https://lists.gnu.org/archive/html/help-gnu-emacs/2022-01/msg00441.html
[2]: https://github.com/msys2/MINGW-packages/blob/master/mingw-w64-emacs/001-ucrt.patch
[3]: https://lists.gnu.org/archive/html/emacs-devel/2024-02/msg00744.html
[4]: https://lists.gnu.org/archive/html/emacs-devel/2024-07/msg01055.html
[5]: https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/fclose-fcloseall

[ucrt.patch (application/octet-stream, attachment)]

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From: Stefan Kangas <stefankangas <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 72335-done <at> debbugs.gnu.org, YI Yue <include_yy <at> qq.com>
Subject: Re: bug#72335: An attempt to fix UCRT64 build failure
Date: Mon, 10 Feb 2025 23:34:17 -0800

Eli Zaretskii <eliz <at> gnu.org> writes:

> tags 72335 wontfix
> thanks
>
>> Date: Sun, 28 Jul 2024 22:55:48 +0900
>> From:  "YI Yue" via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>>
>> I occasionally try to compile Emacs to get the latest commits. But on Windows, I
>> only use Mingw64 because it's the only one officially supported by Emacs.[1]
>> When I try to build Emacs in MSYS2/UCRT64, I'll get these outputs:
>>
>> ./temacs --batch  -l loadup --temacs=pbootstrap \
>>         --bin-dest '/d/user/yy/emacs-build/bin/' --eln-dest '/d/user/yy/emacs-build/lib/emacs/31.0.50/'
>> D:\user\yy\emacs-master\src\temacs.exe: Write error to standard output: No such file or directory
>
> The UCRT build of Emacs on MS-Windows is not officially supported.
> And it will remain unsupported until some volunteer steps forward to
> take the responsibility for testing, maintaining, and developing Emacs
> on Windows when linked with UCRT.  I asked several times for such a
> volunteer, but no one picked up the gauntlet.

I'm therefore closing this bug report.

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