Re: [PATCH v0 1/3] utf8.c: Prepare workaround for iconv under macOS 14/15

> From: Torsten Bögershausen <tboegi@web.de>
>
> MacOS14 (Sonoma) has started to ship an iconv library with bugs.
> The same bugs exists even in MacOS 15 (Sequoia)
>
> A bug report running the Git test suite says:
>
> three tests of t3900 fail on macOS 26.1 for me:
>
>   not ok 17 - ISO-2022-JP should be shown in UTF-8 now
>   not ok 25 - ISO-2022-JP should be shown in UTF-8 now
>   not ok 38 - commit --fixup into ISO-2022-JP from UTF-8
>
> Here's the verbose output of the first one:
>
> ----- snip! -----
> expecting success of 3900.17 'ISO-2022-JP should be shown in UTF-8 now':
>                 compare_with ISO-2022-JP "$TEST_DIRECTORY"/t3900/2-UTF-8.txt
>
> --- /Users/x/src/git/t/t3900/2-UTF-8.txt 2024-10-01 19:43:24.605230684 +0000
> +++ current     2025-12-08 21:52:45.786161909 +0000
> @@ -1,4 +1,4 @@
>  はれひほふ
>
>  しているのが、いるので。
> -濱浜ほれぷりぽれまびぐりろへ。
> +濱浜ほれぷりぽれまび$0$j$m$X!#
> not ok 17 - ISO-2022-JP should be shown in UTF-8 now
> 1..17
> ----- snap! -----
>
> compare_with runs git show to display a commit message, which in this
> case here was encoded using ISO-2022-JP and is supposed to be reencoded
> to UTF-8, but git show only does that half-way -- the "$0$j$m$X!#" part
> is from the original ISO-2022-JP representation.