Re: Obsoleting zlib in Fedora Rawhide

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> Except that it's not 100% compatible, since all those packages aren't
> building/working with zlib-ng-compat.  At a minimum, you should be able
> to show that everything zlib-dependent successfully rebuilds with this,
> and since you've already identified some that don't, IMO they should be
> fixed *first*.

He didn't say the packages weren't working, he said the tests failed, typically because they hardcoded assumptions about the exact behavior of the compression library.  That's a different issue.

As a concrete example, a while back I wanted to add zlib-ng as a build time option to the createrepo_c package, and one such test failed because the zlib-ng gzip output was not identical to zlib gzip output, despite the fact that it *was* correct and decompresses correctly: https://github.com/rpm-software-management/createrepo_c/pull/339/commits/1f3549bfe6ea45e6fd099c0582893766061198c8

It so happened that within days there was another reporter who needed the same fix but for different reasons - because that test was broken on z390 where gzip compression is hardware-accelerated: https://github.com/rpm-software-management/createrepo_c/pull/336

So any tests that are breaking because they expected some exact gzipped output as opposed, were likely fragile anyway, and worked only because zlib has changed very little for a very long time - no new compression strategies, no adjustment of which strategies are used by which levels, etc.


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