c++ bindgen issues (resources/imports/includes)

[kavoc-brown]

Summary

This issue buckets multiple problems to avoid opening many separate issues at once.

Each sub-item is independently reproducible and causes the generated C++ to fail to compile.

If you prefer, I can split this bucket into separate issues.

Environment

• wit-bindgen-cli: 0.47.0
• OS: Ubuntu 22.04.5 LTS (x86_64)

clang command: clang++ -c "$OUT/w.cpp" -I"$OUT" -o "$OUT/w.o"

Details

Sub-issue 1

C++ fails to compile.

Reproduction

package demo:poc;

interface host {
  resource r;
}

world w {
  import host;
  use host.{r};
  export take: func(x: r);
}

Sub-issue 2

missing wit.h

Reproduction

package demo:poc;

interface i {
  resource r;
  f: func(x: borrow<r>);
}

world w {
  export i;
}

Sub-issue 3

C++ fails to compile.

Reproduction

package demo:poc;

interface i {
  resource r;
  take-many: func(xs: list<own<r>>);
}

world w {
  import i;
}

Sub-issue 4

C++ fails to compile.

Reproduction

package demo:poc;

world w {
  export f: func() -> result<u32>;
}

Sub-issue 5

C++ fails to compile.

Reproduction

package demo:poc;

world w {
  record t {
    x: u32,
  }

  import foo: func(x: t);
}

[cpetig]

I suspect at least one is a duplicate of #1481 (same reporter, no response)

The amount of information provided in this report is uncomfortably low (no errors provided) placing a high toll on any person trying to address these. Likely the reported errors are fixed in #1425 which is part of 0.48+

[avrabe]

Tested with wit-bindgen 0.51.0. Two sub-issues still reproduce:

• Sub-issue 2 (resource exports): #include "wit.h" but wit.h not generated
• Sub-issue 4 (result types): wit::Void used but not defined

Minimal reproducers: https://gist.github.com/avrabe/057880a37145ae339d4375e511873f74