RFR: 8349847: Support configuring individual lint categories as errors [v9]

[Vicente Romero]

On Thu, 14 Aug 2025 03:50:27 GMT, Archie Cobbs <acobbs at openjdk.org> wrote:

>> This PR enhances the `-Werror` flag to support lint categories just like `-Xlint` does. For example `-Werror:all,-preview` would cause an error if any warning not in the `preview` lint category occurred.
>> 
>> The existing `-Xlint` flag has a particular behavior when conflicting flags are combined (e.g., `-Xlint:all -Xlint:none -Xlint:foo -Xlint:-foo` is equivalent to `-Xlint:all`). This behavior has been factored out and Javadocumented so that both `-Xlint` and `-Werror` can have this same "parsing" logic.
>> 
>> See the CSR [JDK-8350044](https://bugs.openjdk.org/browse/JDK-8350044) for details on how the new flag behaves in certain corner cases.
>
> Archie Cobbs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 16 commits:
> 
>  - Address review comments.
>  - Merge branch 'master' into JDK-8349847
>  - Merge branch 'master' into JDK-8349847 to fix cross-compiling build problem.
>  - Merge branch 'master' into JDK-8349847 to fix conflicts.
>  - Merge branch 'master' into JDK-8349847 to fix conflicts.
>  - Merge branch 'JDK-8359596' into JDK-8349847 to add "-Xlint:none" fix.
>  - Ensure that "-Xlint:none" still works for the affected warnings.
>    
>    The extra checks for "-Xlint:none" are needed now because of JDK-8352612,
>    which changed the behavior of "-Xlint:none" to no longer imply "-nowarn",
>    which allowed the affected warnings to get away with skipping that check.
>  - Minor naming and Javadoc tweaks.
>  - Merge branch 'JDK-8359596' into JDK-8349847
>  - No need for /nodynamiccopyright/ with this test.
>  - ... and 6 more: https://git.openjdk.org/jdk/compare/8cd79752...e8f5539f

I'm OK with the last version. It could be said that more tests could be added but at the same time given that we are reusing code paths already tested for `Xlint`, then we should be fine. Kind of on the fence here

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Marked as reviewed by vromero (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23622#pullrequestreview-3120898825