uucore: support cygwin

[ognevny]

requires libc patch, mio v1.1.0 and nix patch. behavior is mostly matched with Linux. UNIX_PROGS are currently not supported due to missing ctor/dtor support of cygwin (and possibly a bit more issues)

fixes #5417

[sylvestre]

please format the code! thanks

[ognevny]

please format the code! thanks

I'm in hurry a bit. done

[sylvestre]

please format the code! thanks

I'm in hurry a bit. done

well, i am not :) so, please take your time :)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

[ognevny]

I started to test it, and it seems that signals handling is broken... needs investigation :(
edit:

==>  MINGW_ARCH: clang64
  -> Building clang64...
/etc/post-install/05-home-dir.post: строка 4: exec: id: не найден
==> Сборка пакета mingw-w64-dust 1.2.3-1 (2025 M12 1, Mon 11:23:41)
==> Проверка зависимостей для запуска...
==> Проверка зависимостей для сборки...
/usr/bin/makepkg: строка 1297: chmod: команда не найдена

==> ОШИБКА: An unknown error has occurred. Exiting...
==> Очистка...
/usr/bin/makepkg-mingw: строка 112: 16910 User defined signal 1   MSYSTEM="${_mingw^^}" CHERE_INVOKING=1 bash -leo pipefail -c "/usr/bin/makepkg --config /etc/makepkg_mingw.conf \"\$@\"" bash "$@"

[oech3]

Please use LANG=C makepkg .

I started to test it, and it seems that signals handling is broken...

I think buildable is enough at a moment.

[ognevny]

Please use LANG=C makepkg .

messages in Russian are printed by makepkg, so it doesn't matter much

edit: but yeah, chmod is missing

[ognevny]

ctor doesn't support Cygwin so I have to leave it without UNIX_PROGS for now

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[ognevny]

I started to test it, and it seems that signals handling is broken... needs investigation :(

for reference they're defined here: https://cygwin.com/cgit/newlib-cygwin/tree/winsup/cygwin/include/cygwin/signal.h#n425

[oech3]

requires mio v1.1.0

Is different PR to bump mio possible?

[ognevny]

requires mio v1.1.0

Is different PR to bump mio possible?

no, these deps must update mio first

❯ cargo tree --invert -p mio
mio v1.0.4
├── *crossterm v0.29.0*
│   └── uu_more v0.4.0 (/home/ogn/forks/coreutils/src/uu/more)
│       └── coreutils v0.4.0 (/home/ogn/forks/coreutils)
├── *notify v8.2.0*
│   └── uu_tail v0.4.0 (/home/ogn/forks/coreutils/src/uu/tail)
│       └── coreutils v0.4.0 (/home/ogn/forks/coreutils)
└── *signal-hook-mio v0.2.4*
    └── crossterm v0.29.0

[codspeed-hq]

CodSpeed Performance Report

Merging #9535 will not alter performance

_{Comparing ognevny:cygwin-support (fa71913) with main (003f21a)}

Summary

✅ 126 untouched
⏩ 6 skipped¹

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

[oech3]

https://github.com/rust-lang/libc/releases/tag/0.2.178 was released. It would be nice if you rerun dependabot for this.