RFR: 8290900: Build failure with Clang 14+ due to function warning attribute

[Man Cao]

On Fri, 22 Jul 2022 23:40:08 GMT, Man Cao <manc at openjdk.org> wrote:

> Hi all,
> 
> Could anyone review this change that fixes build failure with Clang 14+?
> The plan is to disable the warning attribute introduced by JDK-8214976, until https://github.com/llvm/llvm-project/issues/56519 is fixed and released.
> 
> -Man

Thanks for the review.

Opened https://bugs.openjdk.org/browse/JDK-8290903 to reinstate the feature.

> I'm also not sure why one would even want this new attribute if it isn't additive. 

https://reviews.llvm.org/D106030 and https://github.com/ClangBuiltLinux/linux/issues/1173 might have some explanation. It seems to support some use cases in Linux kernel, so Clang issues warning/errors at compile time instead of link time.

There is also a pre-submit test failure, which looks like being investigated in https://bugs.openjdk.org/browse/JDK-8290885.

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PR: https://git.openjdk.org/jdk/pull/9621