Build Fails with "wasm32-unknown-unknown target is not supported by default"

[danforbes]

My Substrate build is failing with the following error:

  error: the wasm32-unknown-unknown target is not supported by default, you may need to enable the "js" feature. For more information see: https://docs.rs/getrandom/#webassembly-support
     --> ~/.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.2.3/src/lib.rs:219:9
      |
  219 | /         compile_error!("the wasm32-unknown-unknown target is not supported by \
  220 | |                         default, you may need to enable the \"js\" feature. \
  221 | |                         For more information see: \
  222 | |                         https://docs.rs/getrandom/#webassembly-support");
      | |_________________________________________________________________________^

  error[E0433]: failed to resolve: use of undeclared crate or module `imp`
     --> ~/.cargo/registry/src/github.com-1ecc6299db9ec823/getrandom-0.2.3/src/lib.rs:246:5
      |
  246 |     imp::getrandom_inner(dest)
      |     ^^^ use of undeclared crate or module `imp`

[nuke-web3]

This the base template? I will look where getrandom-0.2.3 in the lock file and dig for what uses it... I suspect this is leaking std in your runtime?

[danforbes]

Second Edit: the standard Node Template builds, so I must have some misconfiguration in my private repo. Let me see if I can try to create a minimal reproducible example.

---

Edit: the below was a red herring. I just needed to change the SUBSTRATE_GIT_URL in this file https://github.com/paritytech/substrate/blob/master/.maintain/node-template-release/src/main.rs I'm building a fresh Node Template now to double-check if I get the same error (unsupported wasm32-unknown-unknown target) as I do in my private repo.

---

I am working off this branch of Substrate https://github.com/danforbes/substrate/tree/danforbes/nonfungibles-create, which includes some changes I need (i.e. paritytech/substrate#9206). I tried to build a clean Node Template and actually got this error:

error: failed to get `frame-benchmarking` as a dependency of package `node-template v3.0.0 (/tmp/.tmpaG9kpM/node-template/node)`

Caused by:
  failed to load source for dependency `frame-benchmarking`

Caused by:
  Unable to update https://github.com/paritytech/substrate.git?rev=4e7c2d8032d1d2d44eef92d36335a5910027c89c

Caused by:
  revspec '4e7c2d8032d1d2d44eef92d36335a5910027c89c' not found; class=Reference (4); code=NotFound (-3)
thread 'main' panicked at 'assertion failed: Command::new(\"cargo\").args(&[\"build\",\n                             \"--all\"]).current_dir(path).status().expect(\"Compiles node\").success()', src/main.rs:183:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

Interestingly, the error that motivated me to open this Issue did not appear until I started benchmarking a custom pallet in a private fork of the Node Template.

[danforbes]

This was caused by user error. I was leaking std through sp-runtime, which I didn't configure properly in my pallet's Cargo.toml file. Thanks for the comment/hint, @nukemandan 💪🏻

[ltfschoen]

i removed sp-keyring from Cargo.toml and that resolved it