Compilation fails with an error I can't understand

[TejasQ]

🐛 Bug description

I run wasm-pack on a "hello world" project from this repo's docs and get this:

Compilation of your program failed. stderr:

   Compiling hello-wasm v0.1.0 (file:///Users/tejaskumar/Sites/LAB/hello-wasm)
error: linking with `rust-lld` failed: signal: 6
  |
  = note: "rust-lld" "-flavor" "wasm" "-L" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.0.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.1.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.2.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.3.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.4.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.f441b8c5-cgu.5.rcgu.o" "-o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.wasm" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.3tme8dahjthaw3n9.rcgu.o" "--gc-sections" "-O3" "-L" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps" "-L" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/release/deps" "-L" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libstd-ae5a63ebbfbc288c.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libpanic_abort-82c215b45187a39b.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libunwind-b52568d2ae2c44cc.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liblibc-2e01bd2578b7fadf.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc_system-c9e1399b13965067.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libdlmalloc-095669714eda974b.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc-355a287908adaa05.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcore-128542c3026fa197.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcompiler_builtins-2a5c24d65378adf1.rlib" "--no-threads" "-z" "stack-size=1048576" "--stack-first" "--allow-undefined" "--no-entry" "--export-table"
  = note: dyld: Library not loaded: @rpath/libLLVM.dylib
            Referenced from: /Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/bin/rust-lld
            Reason: image not found


error: aborting due to previous error

error: Could not compile `hello-wasm`.
warning: build failed, waiting for other jobs to finish...
error: linking with `rust-lld` failed: signal: 6
  |
  = note: "rust-lld" "-flavor" "wasm" "-L" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.0.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.1.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.2.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.3.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.4.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.5.rcgu.o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.hello_wasm.ec57exd1-cgu.6.rcgu.o" "-o" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.wasm" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/hello_wasm.3ljqqko2fp1sh47l.rcgu.o" "--gc-sections" "-O3" "-L" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps" "-L" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/release/deps" "-L" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/tejaskumar/Sites/LAB/hello-wasm/target/wasm32-unknown-unknown/release/deps/libwasm_bindgen-558831ad1dcd2b39.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libstd-ae5a63ebbfbc288c.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libpanic_abort-82c215b45187a39b.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libunwind-b52568d2ae2c44cc.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liblibc-2e01bd2578b7fadf.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc_system-c9e1399b13965067.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libdlmalloc-095669714eda974b.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc-355a287908adaa05.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcore-128542c3026fa197.rlib" "/Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcompiler_builtins-2a5c24d65378adf1.rlib" "--no-threads" "-z" "stack-size=1048576" "--stack-first" "--allow-undefined" "--no-entry" "--export-table"
  = note: dyld: Library not loaded: @rpath/libLLVM.dylib
            Referenced from: /Users/tejaskumar/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/bin/rust-lld
            Reason: image not found


error: aborting due to previous error

error: Could not compile `hello-wasm`.

To learn more, run the command again with --verbose.

Moreover, the --verbose flag doesn't work:

error: Found argument '--verbose' which wasn't expected, or isn't valid in this context
	Did you mean --version?

USAGE:
    wasm-pack init --version

For more information try --help

🤔 Expected Behavior

What should have happened?

I should have had a package.json with compiled wasm code, or have been able to debug with --verbose.

👟 Steps to reproduce

Clear steps describing how to reproduce the issue, including commands and flags run. If you are seeing an error, please include the full error message and stack trace.

1. Clone https://github.com/TejasQ/hello-wasm
2. Install dependencies
3. Try wasm-pack.

🌍 Your environment

Include the relevant details of your environment.
macOS,

➜  hello-wasm git:(master) wasm-pack -V
wasm-pack 0.4.2

➜  hello-wasm git:(master) rustup -V
rustup 1.13.0 (ea9259c1b 2018-07-16)

➜  hello-wasm git:(master) cargo -V
cargo 1.28.0 (96a2c7d16 2018-07-13)

➜  hello-wasm git:(master) rustc -V
rustc 1.28.0 (9634041f0 2018-07-30)

[fitzgen]

This looks like a broken lld/llvm toolchain -- are you messing with DYLD_LIBRARY_PATH or soemthing like that by chance?

@alexcrichton any idea what might be going on here?

[alexcrichton]

Ah yes thanks for the report! This is due to rust-lang/rust#53813 which is fixable via two methods:

• First, you can run rustup component add llvm-tools-preview --toolchain nightly
• Second you can use older nightlies temporarily

We should have a fix soon in nightly!

[TejasQ]

Thanks, both of you!