Error for missing wasm32-unknown-unknown on non-rustup environments can be improved

[gotcha]

🐛 Bug description

As a newbie I am following the tutorial at https://rustwasm.github.io/book/game-of-life/hello-world.html and get errors

🤔 Expected Behavior

When building the project with wasm-pack build I expect no errors.

👟 Steps to reproduce

$ cargo generate --git https://github.com/rustwasm/wasm-pack-template

then type wasm-game-of-life

$ cd wasm-game-of-life
$ wasm-pack build
[INFO]: 🎯  Checking for the Wasm target...
Error: wasm32-unknown-unknown target not found!

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.7.0
rustc version: 1.31.0
MacOS Sierra

[ashleygwilliams]

looks like this is a bug in the new, not quite yet released version of wasm-pack! thanks for filing i will get right on it!

[ashleygwilliams]

i just ran this on my machine with the current tagged 0.7.0 (which due to some clumsiness on my part may not be the version 0.7.0 that you have @gotcha ) and got this, which is the expected behavior:

ag-dubss-MacBook-Pro:wasm-pack ag_dubs$ rustup target remove wasm32-unknown-unknown
info: removing component 'rust-std' for 'wasm32-unknown-unknown'
ag-dubss-MacBook-Pro:wasm-pack ag_dubs$ cargo run -- build ../hello-wasm/
    Finished dev [unoptimized + debuginfo] target(s) in 0.59s
     Running `target/debug/wasm-pack build ../hello-wasm/`
[INFO]: 🎯  Checking for the Wasm target...
info: downloading component 'rust-std' for 'wasm32-unknown-unknown'
info: installing component 'rust-std' for 'wasm32-unknown-unknown'
[INFO]: 🌀  Compiling to Wasm...
    Finished release [optimized] target(s) in 0.20s
[INFO]: ⬇️  Installing wasm-bindgen...
[INFO]: Optional fields missing from Cargo.toml: 'description', 'repository', and 'license'. These are not necessary, but recommended
[INFO]: ✨   Done in 2.24s
[INFO]: 📦   Your wasm pkg is ready to publish at ../hello-wasm/pkg.

i think you are using a faulty release that i made last night/this morning. if you can give me a few minutes there should be a new one. if you uninstall and reinstall you should be all set. i'll come back here and comment when the new release is posted.

[gotcha]

@ashleygwilliams In the meanwhile, I checked my setup and found a mix of rust installed via brew and rustup.
I removed everything and am in the process of installing a fresh rust with rustup.

[ashleygwilliams]

@gotcha that's very helpful info! that being said, this release is supposed to support non-rustup setups, tho we may not have considered the multiple rusts scenario - we definitely don't want the error you got, even in the env you had, so we should try to reproduce and make sure it works.

do let me know if updating your env helps! that'll be useful. either way, thanks so much for filing!

[gotcha]

@ashleygwilliams BTW, the script at https://rustwasm.github.io/wasm-pack/installer/ fails because it references a 0.6.1 release that does not exist.

[gotcha]

@ashleygwilliams With a fresh rust setup (1.33.0) with rustup, I manage to build the project.

[gotcha]

BTW, the script at https://rustwasm.github.io/wasm-pack/installer/ fails because it references a 0.6.1 release that does not exist.

@ashleygwilliams This is fixed. I guess you will update https://rustwasm.github.io/ to mention 0.7.0.

[ashleygwilliams]

@gotcha yeah there is a small lag between when i make a release and when the installer works because of latency! glad to hear you were able to build the project! i'm going to leave this open because i want to make sure that we can work when someone has both a brew installed and rustup installed rust(s)! thanks for your diligence here and glad you got it to work!