RFR: 8349847: Support configuring individual lint categories as errors

[Archie Cobbs]

On Thu, 13 Feb 2025 20:52:49 GMT, Archie Cobbs <acobbs at openjdk.org> wrote:

> This PR refines the `-Werror` flag to support lint categories just like `-Xlint` does. So, for example `-Werror:all,-preview` would cause an error if any warning other than a `preview` warning occurred.
> 
> A few notes:
> * Some warnings emitted by the compiler do not have a corresponding `Lint` category. As always, they cause an error if `-Werror` is given, but what if `-Werror:all` is given instead? The answer given here is yes, an error will occur.
> * The `-Werror` works the same way as before, i.e., any warning results in an error. That means if `-Werror` is given `-Werror:foo` flags have no effect.
> * Refactoring has been done to allow `-Xlint` and `-Werror` to utilize the same "parsing" logic. The existing `-Xlint` flag has a particular behavior when conflicting flags are combined (e.g., `-Xlint:all -Xlint:none -Xlint:foo -Xlint:-foo` equals `-Xlint:all`). This behavior has been preserved and Javadocumented.
> * A few minor cleanups are included

Keepis Alivimus

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PR Comment: https://git.openjdk.org/jdk/pull/23622#issuecomment-2772607370