CI failure

[yutannihilation]

https://github.com/extendr/libR-sys/actions/runs/4640105301

  error[E0425]: cannot find value `R_CStackLimit` in this scope
     --> src\lib.rs:128:17
      |
  128 |                 R_CStackLimit = usize::max_value();
      |                 ^^^^^^^^^^^^^
      |
  help: you might have meant to introduce a new binding
      |
  128 |                 let R_CStackLimit = usize::max_value();
      |                 +++
  
  error[E0412]: cannot find type `ParseStatus` in this scope
     --> src\lib.rs:145:29
      |
  145 |             let mut status: ParseStatus = 0;
      |                             ^^^^^^^^^^^ not found in this scope
  
  error[E0412]: cannot find type `ParseStatus` in this scope
     --> src\lib.rs:146:50
      |
  146 |             let status_ptr = &mut status as *mut ParseStatus;
      |                                                  ^^^^^^^^^^^ not found in this scope

My guess is that this is the core is the problem. Maybe the underlying clang changed the options?

  [libR-sys 0.4.0] cargo:warning=unused option: --allowlist-var 

[Ilia-Kosenkov]

I suspect also this: it does not recognize --allowlist-function

https://github.com/extendr/libR-sys/actions/runs/4640105301/jobs/8218573032#step:14:98

[yutannihilation]

Yeah, I meant these --allowlist-* options.

[Ilia-Kosenkov]

I am gonna update my local setup (including MSYS) to check if I can reproduce this. Searching relevant repos gave me nothing, and the fact it fails strictly on Windows suggests it is something MSYS-related

[Ilia-Kosenkov]

Confirmed locally. I'll look into this & if it can be patched temporarily

[Ilia-Kosenkov]

Since MSYS seems to provide only the latest version of any package, I had to resort to compiling bindings using native installation of llvm. Using chocolatey versioning, I can reliably reproduce that on llvm 15.0.7 (latest 15.x.x version), things work as before, but on llvm 16.0.0 it breaks. So two takeaway messages:

1. We can compile bindings on Windows using native llvm and Rtools, no need for MSYS
2. Something has changed between 15.0.7 and 16.0.0 that affects bindgen (or maybe clang) rust crates

[Ilia-Kosenkov]

Filed an issue at bindgen rust-lang/rust-bindgen#2488 . Let's see if they can point us in the right direction.

[yutannihilation]

(Note to self) This is the anonymous enum in question.

https://github.com/r-devel/r-svn/blob/9d9ba44635ff918ce2e1254a0c820d55cfed050b/src/include/Rinternals.h#L1144-L1150

[CGMossa]

Closing this since #154 fixes this.
Now on to the Rcomplex mess.