Error targeting wasm32-unknown-unknown

[dsherret]

Thanks for adding wasm support as this library was the only one that didn't allow using the Rust compiler in wasm. It seems though that it only works for wasm32-wasi and not wasm32-unknown-unknown. I'm not sure what the fix is.

Reproduction steps:

git clone https://github.com/rust-lang/stacker.git
cd stacker
cargo build --release --target wasm32-unknown-unknown

Outputs:

Compiling stacker v0.1.10 (/mnt/v/stacker)
error[E0412]: cannot find type `c_void` in crate `libc`
   --> src/lib.rs:121:35
    |
121 |             new_stack: *mut libc::c_void,
    |                                   ^^^^^^ not found in `libc`
    |
help: possible candidates are found in other modules, you can import them into scope
    |
35  | use std::ffi::c_void;
    |
35  | use std::os::raw::c_void;
    |

error: aborting due to previous error

[nagisa]

Dependency on libc could be replaced with std::ffi...

[dsherret]

@nagisa awesome. Thanks! I’m glad that was easy.

[ctaggart]

I would love to see a version of stacker published with this fix. It affects stacker v0.1.10 and unfortunately, a bunch of dependencies that rustfmt-nightly uses took a dependency on that.

$ cargo tree -i stacker
stacker v0.1.10
└── rustc-ap-rustc_data_structures v671.0.0
    ├── rustc-ap-rustc_arena v671.0.0
    │   └── rustc-ap-rustc_span v671.0.0
    │       ├── rustc-ap-rustc_ast v671.0.0
    │       │   ├── rustc-ap-rustc_ast_passes v671.0.0
    │       │   │   └── rustc-ap-rustc_expand v671.0.0
    │       │   │       └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2)
    │       │   │           └── ts2rs v0.2.0 (/Users/cameron/rs/ts2rsapp)
    │       │   ├── rustc-ap-rustc_ast_pretty v671.0.0
    │       │   │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_attr v671.0.0
    │       │   │   │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   │   │   └── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_parse v671.0.0
    │       │   │   │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   │   │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   │   │   └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    │       │   │   └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    │       │   ├── rustc-ap-rustc_attr v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_parse v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_session v671.0.0
    │       │   │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_attr v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   │   ├── rustc-ap-rustc_parse v671.0.0 (*)
    │       │   │   └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    │       │   └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    │       ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       ├── rustc-ap-rustc_ast_pretty v671.0.0 (*)
    │       ├── rustc-ap-rustc_attr v671.0.0 (*)
    │       ├── rustc-ap-rustc_errors v671.0.0
    │       │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_attr v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_parse v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_session v671.0.0 (*)
    │       │   └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    │       ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       ├── rustc-ap-rustc_feature v671.0.0
    │       │   ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_attr v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_expand v671.0.0 (*)
    │       │   ├── rustc-ap-rustc_parse v671.0.0 (*)
    │       │   └── rustc-ap-rustc_session v671.0.0 (*)
    │       ├── rustc-ap-rustc_parse v671.0.0 (*)
    │       ├── rustc-ap-rustc_session v671.0.0 (*)
    │       ├── rustc-ap-rustc_target v671.0.0
    │       │   ├── rustc-ap-rustc_ast_pretty v671.0.0 (*)
    │       │   └── rustc-ap-rustc_session v671.0.0 (*)
    │       └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)
    ├── rustc-ap-rustc_ast v671.0.0 (*)
    ├── rustc-ap-rustc_ast_passes v671.0.0 (*)
    ├── rustc-ap-rustc_attr v671.0.0 (*)
    ├── rustc-ap-rustc_errors v671.0.0 (*)
    ├── rustc-ap-rustc_expand v671.0.0 (*)
    ├── rustc-ap-rustc_feature v671.0.0 (*)
    ├── rustc-ap-rustc_parse v671.0.0 (*)
    ├── rustc-ap-rustc_session v671.0.0 (*)
    ├── rustc-ap-rustc_span v671.0.0 (*)
    ├── rustc-ap-rustc_target v671.0.0 (*)
    └── rustfmt-nightly v2.0.0-rc.2 (https://github.com/rust-lang/rustfmt?rev=218593f2ac55030316c0b0546240843f0e32b292#218593f2) (*)

Workaround for now is pretty easy though:

[patch.crates-io]
stacker = { git = "https://github.com/rust-lang/stacker" }

[nagisa]

Will do within next 15 minutes.