Compilation error due to proc-macro not supported

[nitnelave]

🐛 Bug description

cargo install wasm-pack
    Updating crates.io index
[...]
  Downloaded filetime v0.2.17
error: failed to compile `wasm-pack v0.10.3`, intermediate artifacts can be found at `/tmp/cargo-install8SJwiv`

Caused by:
  cannot produce proc-macro for `failure_derive v0.1.8` as the target `x86_64-unknown-linux-gnu` does not support these crate types

👟 Steps to reproduce

It can be reproduced in Github actions with the following script:

jobs:
  build:
    runs-on: ubuntu-latest
    container:
      image: rust:1.62
      env:
        CARGO_TERM_COLOR: always
        RUSTFLAGS: -Ctarget-feature=+crt-static
    steps:
      - name: install wasm-pack with cargo
        run: cargo install wasm-pack

🌍 Your environment

wasm-pack version: 0.10.3
rustc version: 1.62
container: ubuntu, x86_64

[nitnelave]

Ah, I found rust-lang/rust#78210, so it seems it's related to the RUSTFLAGS. It works if I remove the env variable (which was only intended for my own code anyway).

Closing this.