ZSystems

https://repo.or.cz/tinycc.git

Already existing ports (originally released for i586/amd64): aarch64, riscv

https://lists.gnu.org/archive/html/tinycc-devel/2021-07/msg00008.html

For each architecture, there's a set of files:
-asm.[ch]
-gen.c
-link.c
-tok.h

The -asm.h and -tok.h files seem to be optional.

So, a (new) set of files for s390x would be needed.

BUT: Can't be done "jsut like that" - requires knowledge about s390x/zSystems assembler and suuch. => blocked