RFR: 8325163: Enable -Wpedantic on clang

[Magnus Ihse Bursie]

On Mon, 5 Feb 2024 03:07:43 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> at least not for a future version applying to gcc builds.

@kimbarrett @TheShermanTanker Please do not drag gcc into this PR. This is just about clang. Unless gcc makes a serious effort to shape up their inferior warning handling, I don't think we will ever be able to do something similar for gcc. 

But that is not a reason to avoid doing it on clang. In general, we have tried to utilize the strength of every compiler, regardless of if all the other compilers could detect the same problem or not.

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PR Comment: https://git.openjdk.org/jdk/pull/17687#issuecomment-1926559951