LDC 1.40.1 cannot target s390x-linux with warnings enabled

[jacob-carlborg]

When targeting s390x-linux and enabling warnings, LDC fails with an error.

Running the following command:

echo '' | ldc2 -mtriple s390x-linux - -c -w

Results in the following error:

Warning: unknown target ABI, falling back to generic implementation. C/C++ interop will almost certainly NOT work.
Error: warnings are treated as errors
       Use -wi if you wish to treat warnings only as informational.

This worked fine with LDC 1.40.0. s390x-linux seems to be the only target which has this problem [1].

$ ldc2 --version
LDC - the LLVM D compiler (1.40.1-git-880d514):
  based on DMD v2.110.0 and LLVM 19.1.7
  built with LDC - the LLVM D compiler (1.40.1-git-880d514)
  Default target: aarch64-unknown-linux-gnu
  Host CPU: (unknown)
  http://dlang.org - http://wiki.dlang.org/LDC

[1] https://github.com/jacob-carlborg/lime/actions/runs/14140513059

[kinke]

I made this a proper warning; it was previously only visible in the -vv log. It's a serious problem for anything more complex than a hello-world.

[kinke]

I.e. there was never any official s390x support; that would require #4810 for a start.

[jacob-carlborg]

That's disappointing 😞. I didn't expect druntime or Phobos to work but I thought the regular code generation would. It's been working so far for me, but I don't have that much code yet. I also use both extern (C) and extern (C++) in a few cases and it seems to work.

[kinke]

Can we close this then?

[jacob-carlborg]

I guess so.