I've now looked a bit closer at the code that is build when things break,
and remembered the issues with builtins we have at LP#2075567 (caused by 
aligning the gcc builtins to the llvm ones).
This is meanwhile fixed by IBM:
https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/2075567/comments/4

Since it's not upstream accepted yet, I'm picking two patches myself:
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=e8a7142a697c5d2673adea33ba23af82a89c9559
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=a247088adaf122116919235f4a40189506139495
and building a patched gcc:
https://launchpad.net/~fheimes/+archive/ubuntu/lp2073786/+sourcepub/16399725/+listing-archive-extra
(seems to be a bit tricky, since the d/patch handling is different and several 
rules files exist, but let's see)

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https://bugs.launchpad.net/bugs/2077055

Title:
  s390-tools v2.34.0 FTBFS on oracular/s390x

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