RFR: 8340801: Disable ubsan checks in some awt/2d coding [v2]

[David Holmes]

On Tue, 1 Oct 2024 13:45:56 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> There is some old awt/2d coding where warnings occur when running with ubsan enabled binaries.
>> However at most of these locations the coding should work (at least on our supported platform set) so the warnings can be disabled at least for now.
>> 
>> The change adds a macro ATTRIBUTE_NO_UBSAN  similar to what we already use in Hotspot coding.
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove ubsan changes from jni_md.h

`hotspot/share/include` contains the headers that hotspot exports to the jdk. `os/posix/include/` has the platform specific header that hotspot exports to the jdk.

> So maybe src/java.base/unix/native/libjava

That is header files for libjava.

This is why I said it would be hard to find a shared location where this can be used across different modules - because there presently isn't one.

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PR Comment: https://git.openjdk.org/jdk/pull/21184#issuecomment-2388071669