[GitHub] [arrow] alamb commented on pull request #8864: ARROW-10838: [Rust] [CI] Add arrow build targeting wasm32

[GitBox <gi...@apache.org>]

alamb commented on pull request #8864:
URL: https://github.com/apache/arrow/pull/8864#issuecomment-747058180


   I don't fully understand what this check is doing
   
   I see it did something which claims to have run `cargo build --target wasm32-unknown-unknown`:
   <img width="929" alt="Screen Shot 2020-12-16 at 4 34 47 PM" src="https://user-images.githubusercontent.com/490673/102409205-a6d04280-3fbc-11eb-928c-1c2213e8107e.png">
   
   But it takes a suspiciously short amount of time (8s) and when I do (seemingly) the same thing locally I get a bunch of compilation errors
   
   ```
    Compiling encode_unicode v0.3.6
   error[E0433]: failed to resolve: could not find `unix` in `os`
     --> /Users/alamb/.cargo/registry/src/github.com-1ecc6299db9ec823/dirs-1.0.5/src/lin.rs:41:18
      |
   41 |     use std::os::unix::ffi::OsStringExt;
      |                  ^^^^ could not find `unix` in `os`
   
   error[E0432]: unresolved import `unix`
    --> /Users/alamb/.cargo/registry/src/github.com-1ecc6299db9ec823/dirs-1.0.5/src/lin.rs:6:5
     |
   6 | use unix;
     |     ^^^^ no `unix` in the root
   
      Compiling hex v0.4.2
      Compiling tower-service v0.3.0
      Compiling alloc-no-stdlib v2.0.1
      Compiling adler32 v1.0.4
   error[E0599]: no function or associated item named `from_vec` found for struct `OsString` in the current scope
     --> /Users/alamb/.cargo/registry/src/github.com-1ecc6299db9ec823/dirs-1.0.5/src/lin.rs:48:34
      |
   48 |     Some(PathBuf::from(OsString::from_vec(out)))
      |                                  ^^^^^^^^ function or associated item not found in `OsString`
      |
      = help: items from traits can only be used if the trait is in scope
      = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
              `use std::sys_common::os_str_bytes::OsStringExt;`
   
   error: aborting due to 3 previous errors
   
   Some errors have detailed explanations: E0432, E0433, E0599.
   For more information about an error, try `rustc --explain E0432`.
   error: could not compile `dirs`
   
   To learn more, run the command again with --verbose.
   warning: build failed, waiting for other jobs to finish...
   error: build failed
   
   ```
   
   I probably don't have something installed right
   
   


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