RFR: 8339156: Use more fine-granular clang unused warnings [v2]

[Erik Joelsson]

On Fri, 30 Aug 2024 11:35:51 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Currently, we issue -Wno-unused for all files in clang, which is a rather big sledgehammer to get rid of some warnings that proliferate in a few areas of the build.
>> 
>> We should instead leave -Wunused turned on (as done by -Wall) and use a much more fine-grained approach to disabling specific warnings in specific files or libraries.
>> 
>> This is similar to what has been done for gcc in JDK-8339120.
>
> 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 two commits:
> 
>  - Merge branch 'master' into finegranular-clang-unused
>  - 8339156: Use more fine-granular clang unused warnings

Marked as reviewed by erikj (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20770#pullrequestreview-2273037764