RFR: 8301971: Make JDK source code UTF-8 [v3]

[Martin Doerr]

On Mon, 14 Apr 2025 12:53:35 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 incrementally with three additional commits since the last revision:
> 
>  - Also document UTF-8 requirements (solves JDK-8338973)
>  - Let configure only accept utf-8 locales
>  - Address review comments from Kim

We get the following problem on AIX:

checking for locale to use... no UTF-8 locale found
configure: error: No UTF-8 locale found. This is required for building successfully.
configure exiting with result code 1

@varada1110, @JoKern65: Can you take a look, please?

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PR Comment: https://git.openjdk.org/jdk/pull/24574#issuecomment-2808717775