RFR: 8295715: Minimize disabled warnings in serviceability libs

[Magnus Ihse Bursie]

On Thu, 20 Oct 2022 17:54:51 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> After [JDK-8294281](https://bugs.openjdk.org/browse/JDK-8294281), it is now possible to disable warnings for individual files instead for whole libraries. I used this opportunity to go through all disabled warnings in the serviceability native libraries.
>> 
>> Any warnings that were only triggered in a few files were removed from the library as a whole, and changed to be only disabled for those files.
>> 
>> Some warnings didn't trigger in any file anymore, and could just be removed.
>
> Is there any desire to clean up these warnings? I see back in 2015 there were a bunch of "Resolve disabled warnings for libXXX" bugs that you fixed. Any plans to make another pass. Seems like some of these warnings might be hiding real bugs.

@plummercj I agree that it could very well be that these warnings are signs of real bugs. And yes, I plan to open new bugs requesting for these warnings to be fixed, if possible, if not someone else beats me to it. 

However, it is mostly out of scope for me to fix, since domain knowledge by the respective component teams are usually required. And the old "Resolve disabled warnings for libXXX" JBS issues were created by me, but not fixed by me (in general).

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PR: https://git.openjdk.org/jdk/pull/10786