RFR: 8342939: Building ZGC without compiler2 fails

[Thomas Schatzl]

On Thu, 24 Oct 2024 08:06:30 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this change that makes ZGC compile without the C2 compiler.
> 
> The solution is to ifdef the offending C2 code, and returning `false` for the predicate that checks whether this is a C2 compilation (which can't be because there is no C2 compiled in).
> 
> Testing: manual compilation without C2, gha
> 
> Thanks,
>   Thomas

I verified that ZGC builds with only c1 and c2 too, did not check Graal, but apparently that's being handled already.

Thanks @fisk @vnkozlov @Hamlin-Li for your reviews.

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PR Comment: https://git.openjdk.org/jdk/pull/21677#issuecomment-2437068843