state of openjdks zlib on s390x

[Alan Bateman]

On 21/10/2025 15:26, Eduard Stefes wrote:
> Hello,
>
> Disclaimer: This is email could cause cause discussions and work.
>
> # TLDR
>
> zlib (and zlib-ng) on s390x use hardware compression. This
> hardware compression implementation has currently some problems when
> used by openjdk.
>
It would be better to bring this discussion to core-libs-dev. Test 
descriptions can include constraints so they are only selected (or not 
selected) on specific platforms and/or in specific configurations. Also 
tests for the zip area also have some history with issues that only 
surface with specific zlib implementations. There is interest in 
reproducible builds in some quarters (including IBM folks building the 
JDK) but this is indeed problematic when using zlib compression.

-Alan
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