OS System Rust package pecularities cause wasm-pack build not to work on Quickstart from wasm-book

[daidoji]

🐛 Bug description

Summary:

1. I attempted to complete the Quickstart "hello-wasm" from the wasm-book.
2. Got error for no wasm32-unknown-unknown target.
3. Followed instructions for non-rustup install of that target with slight alterations for my particular OS below.
4. Still got a weird error
5. Followed up and explored a bit and point out where I think the issue is in wasm-build.

Got this error.

(keri) daidoji@darkstar:~/ssi/cesride/wasm$ wasm-pack build
[INFO]: 🎯  Checking for the Wasm target...
Error: wasm32-unknown-unknown target not found in sysroot: "/usr"

Used rustc from the following path: "/usr/bin/rustc"
It looks like Rustup is not being used. For non-Rustup setups, the wasm32-unknown-unknown target needs to be installed manually. See https://rustwasm.github.io/wasm-pack/book/prerequisites/non-rustup-setups.html on how to do this.

Caused by: wasm32-unknown-unknown target not found in sysroot: "/usr"

Used rustc from the following path: "/usr/bin/rustc"
It looks like Rustup is not being used. For non-Rustup setups, the wasm32-unknown-unknown target needs to be installed manually. See https://rustwasm.github.io/wasm-pack/book/prerequisites/non-rustup-setups.html on how to do this.

Attempted to follow the instructions in the error message (ie https://rustwasm.github.io/wasm-pack/book/prerequisites/non-rustup-setups.html). However, I'm using Slackware Linux (-current) and the system rust package (not installed with rustup). Slackware seems to install rustlib to /usr/lib64/rustlib/. So I put the files there thinking it would be no big deal.

Got the same error. ie)

(keri) daidoji@darkstar:~/ssi/cesride/wasm$ rustc --print sysroot
/usr
(keri) daidoji@darkstar:~/ssi/cesride/wasm$ ls /usr/lib64/rustlib/
components   manifest-cargo.gz           manifest-rust-src.gz                           manifest-rustfmt-preview.gz  uninstall.sh*
etc/         manifest-clippy-preview.gz  manifest-rust-std-x86_64-unknown-linux-gnu.gz  rust-installer-version       wasm32-unknown-unknown/
install.log  manifest-rust-docs.gz       manifest-rustc.gz                              src/                         x86_64-unknown-linux-gnu/

Then I ran with RUST_LOG, wasm-build is def looking in /usr/lib/rustlib

(keri) daidoji@darkstar:~/ssi/cesride/wasm$ RUST_LOG=info wasm-pack build
[INFO  wasm_pack::command] Running build command...
[INFO  wasm_pack::command::build] Checking rustc version...
[INFO  wasm_pack::command::build] rustc version is 70.
[INFO  wasm_pack::command::build] Checking crate configuration...
[INFO  wasm_pack::command::build] Crate is correctly configured.
[INFO  wasm_pack::command::build] Checking for wasm-target...
[INFO]: 🎯  Checking for the Wasm target...
[INFO  wasm_pack::build::wasm_target] Looking for wasm32-unknown-unknown in "/usr/lib/rustlib"
[INFO  wasm_pack::build::wasm_target] Failed to find wasm32-unknown-unknown in "/usr/lib/rustlib"
...

However, rustc seems to know where those target files are located

(keri) daidoji@darkstar:~/ssi/cesride/wasm/hello-wasm$ rustc --target wasm32-unknown-unknown --print target-libdir
/usr/lib64/rustlib/wasm32-unknown-unknown/lib

I tried putting a softlink where wasm-build is expecting those files to live but then I got this weird error but I'm too new to Rust to figure out what that means exactly.

(keri) daidoji@darkstar:~/ssi/cesride/waqm/hello-wasm$ sudo ln -s /usr/lib64/rustlib /usr/lib/rustlib
(keri) daidoji@darkstar:~/ssi/cesride/wasm/hello-wasm$ wasm-pack build
[INFO]: 🎯  Checking for the Wasm target...
[INFO]: 🌀  Compiling to Wasm...
   Compiling proc-macro2 v1.0.69
   Compiling unicode-ident v1.0.12
   Compiling wasm-bindgen-shared v0.2.87
   Compiling once_cell v1.18.0
   Compiling bumpalo v3.14.0
   Compiling log v0.4.20
   Compiling wasm-bindgen v0.2.87
   Compiling cfg-if v1.0.0
error[E0514]: found crate `core` compiled by an incompatible version of rustc
  |
  = note: the following crate versions were found:
          crate `core` compiled by rustc 1.70.0 (90c541806 2023-05-31): /usr/lib64/rustlib/wasm32-unknown-unknown/lib/libcore-fd7d76a056998c87.rlib
  = help: please recompile that crate using this compiler (rustc 1.70.0 (90c541806 2023-05-31) (built from a source tarball)) (consider running `cargo clean` first)

error[E0514]: found crate `compiler_builtins` compiled by an incompatible version of rustc
  |
  = note: the following crate versions were found:
          crate `compiler_builtins` compiled by rustc 1.70.0 (90c541806 2023-05-31): /usr/lib64/rustlib/wasm32-unknown-unknown/lib/libcompiler_builtins-b4a59f6f2c0f4614.rlib
  = help: please recompile that crate using this compiler (rustc 1.70.0 (90c541806 2023-05-31) (built from a source tarball)) (consider running `cargo clean` first)

For more information about this error, try `rustc --explain E0514`.
error: could not compile `cfg-if` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...
Error: Compiling your crate to WebAssembly failed
Caused by: Compiling your crate to WebAssembly failed
Caused by: failed to execute `cargo build`: exited with exit status: 101
  full command: cd "/home/daidoji/ssi/cesride/wasm/hello-wasm" && "cargo" "build" "--lib" "--release" "--target" "wasm32-unknown-unknown"

🤔 Expected Behavior

The Quickstart Hello-wasm guide should work even though I'm using a non-rustup env.

👟 Steps to reproduce

Oh sorry, there should be enough from above. I literally couldn't get through the quickstart guide so running it on a slackware system should produce the same issue.

Wasm-pack starting point

Looks like this is the guilty culprit. Instead of using this and instead using whatever rustc --target wasm32-unknown-unknown --print target-libdir is doing to locate that directory seems like the right way to go about it. Glad to submit a PR if someone can point me in the right direction. Still learning Rust and wasm-pack.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: wasm-pack 0.12.1
rustc version: rustc 1.70.0 (90c541806 2023-05-31) (built from a source tarball)

[daidoji]

Same as above but in discord form https://discord.com/channels/453584038356058112/678630028711559181/1167261887587700766

[drager]

Fixed in #1343