RFR: 8339120: Use more fine-granular gcc unused warnings [v5]

[Magnus Ihse Bursie]

On Wed, 28 Aug 2024 12:29:36 GMT, Magnus Ihse Bursie <ihse at openjdk.org> wrote:

>> Good point, I'll try that.
>
> It turned out to be sort-of okay-ish. I explicitly listed like 6 or so per-file exclusions in Hotspot (even though my normal cutoff for just setting a component-wide exclude is 3-4) since it seems that you will want to look at and fix those.

Actually, it was probably a bad idea. I've been chasing platform-specific build failures for the last hour or so. :( But now at least it is done. I hope you guys can use this to actually fix the problems so it was worth it. ;-)

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PR Review Comment: https://git.openjdk.org/jdk/pull/20733#discussion_r1734869178