LLVM 15

[jemc]

LLVM 15 has some significant breaking changes, including:

• LLVM Pointers can no longer track an element type.
• LLVM Optimization passes need to be run through the New Pass Manager.

[jemc]

I can't figure out why the "full program" runner is exiting with status 1, without any output to explain why. It's not a crash that I could catch by trying to run the runner itself in lldb - it appears to be a clean exit without crash.

@kulibali - Can you take a look and see if you have any ideas?

[chalcolith]

When I debug into it on Windows, it calls _CliOptions.apply(), then CommandSpec.leaf(), then CommandSpec._assertName(). The second value returned from the call to nm.values() is \x0, although nm->_ptr is "runner". It then calls error, and exits with code 1.

[chalcolith]

This program demonstrates the problem (and another one):

actor Main
  new create(env: Env) =>
    let str = "Hello, world."
    env.out.print(str)

    for ch in str.values() do
      env.out.print("ch is '" + USize.from[U8](ch).string() + "'")

      if ch == 0 then
        env.exitcode(1)
        break
      end
    end

For me it produces:

Hello, world.
ch is '
ch is '
ch is '

So the string concat is not working right either.

[jemc]

Thanks for narrowing down to a minimal program!

[jemc]

There's one more error left in CI that I think could be resolved by disabling zstd in LLVM (since we're not using it anyway).

@kulibali - do you know what the right variable is to disable that?

[chalcolith]

@jemc I believe it's LLVM_ENABLE_ZSTD

[jemc]

This is ready for review, but I don't want to merge it until addressing the open question I posed above.

[SeanTAllen]

@kulibali can you give this another review so we can merge it in?

[chalcolith]

Ok, I'm busy this weekend but I'll try to take a look on Monday.