RFR: 8301971: Make JDK source code UTF-8 [v6]

[Naoto Sato]

On Thu, 8 May 2025 10:19:31 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Most of the JDK code base has been transitioned to UTF-8, but not all. This has recently become an acute problem, since our mixing of iso-8859-1 and utf-8 in properties files confused the version of `sed` that is shipped with the new macOS 15.4.
>> 
>> The fix is basically simple, and includes the following steps:
>> * Look through the code base for text files containing non-ASCII characters, and convert them to UTF-8, if they are not already
>> * Update tooling used in building to recognize the fact that files are now in UTF-8 and treat them accordingly (basically, updating compiler flags, git attributes, etc).
>
> Magnus Ihse Bursie has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 14 commits:
> 
>  - Merge branch 'master' into go-full-utf8
>  - Merge branch 'master' into go-full-utf8
>  - Add informative message  about supported locales.
>  - Allow C locale with warning instead of fatal error
>  - Also document UTF-8 requirements (solves JDK-8338973)
>  - Let configure only accept utf-8 locales
>  - Address review comments from Kim
>  - Also tell javadoc that we have utf-8 now
>  - Fix flags for Windows
>  - Mark java and native source code as utf-8
>  - ... and 4 more: https://git.openjdk.org/jdk/compare/2c1eb339...e68305db

Marked as reviewed by naoto (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/24574#pullrequestreview-2826102855