Cannot build first example

[slowkow]

I'm just trying to follow the steps in the tutorial. Any tips would be greatly appreciated! I may be missing something obvious, because I've never worked with Rust or wasm before.

https://rustwasm.github.io/book/game-of-life/hello-world.html

My steps:

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

# I called my project try-wasm

cd try-wasm

wasm-pack init

I get:

  [1/8] 🔧  Checking crate configuration...
  [2/8] 🎯  Adding WASM target...
- [3/8] 🌀  Compiling to WASM...
Compilation of your program failed. stderr:

Here is the full output:

Compilation of your program failed. stderr:

$ wasm-pack init

  [1/8] 🔧  Checking crate configuration...
  [2/8] 🎯  Adding WASM target...
- [3/8] 🌀  Compiling to WASM...
Compilation of your program failed. stderr:

    Updating registry `https://github.com/rust-lang/crates.io-index`
 Downloading wasm-bindgen v0.2.19
 Downloading wasm-bindgen-macro v0.2.19
 Downloading wasm-bindgen-macro-support v0.2.19
 Downloading wasm-bindgen-shared v0.2.19
 Downloading wasm-bindgen-backend v0.2.19
   Compiling proc-macro2 v0.4.15
   Compiling unicode-xid v0.1.0
   Compiling version_check v0.1.4
   Compiling ryu v0.2.6
   Compiling serde v1.0.75
   Compiling wasm-bindgen-shared v0.2.19
   Compiling itoa v0.4.2
   Compiling cfg-if v0.1.5
   Compiling log v0.4.4
   Compiling lazy_static v1.1.0
   Compiling quote v0.6.8
   Compiling syn v0.14.9
   Compiling serde_json v1.0.26
   Compiling serde_derive v1.0.75
   Compiling wasm-bindgen-backend v0.2.19
   Compiling wasm-bindgen-macro-support v0.2.19
   Compiling wasm-bindgen-macro v0.2.19
   Compiling wasm-bindgen v0.2.19
   Compiling try-wasm v0.1.0 (file:///Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm)
warning: function is never used: `set_panic_hook`
  --> src/utils.rs:11:9
   |
11 |         pub fn set_panic_hook() {}
   |         ^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: #[warn(dead_code)] on by default

error: linking with `rust-lld` failed: signal: 6
  |
  = note: "rust-lld" "-flavor" "wasm" "-L" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/umap_wasm.umap_wasm.bkno5jfr-cgu.0.rcgu.o" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/umap_wasm.umap_wasm.bkno5jfr-cgu.1.rcgu.o" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/umap_wasm.umap_wasm.bkno5jfr-cgu.2.rcgu.o" "-o" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/umap_wasm.wasm" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/umap_wasm.44e0i2zwvzwfmnu7.rcgu.o" "--gc-sections" "-O3" "-L" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps" "-L" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/release/deps" "-L" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/libwasm_bindgen-f9f62e4f9e995bb5.rlib" "/Users/slowikow/Dropbox/work/github.com/slowkow/try-wasm/target/wasm32-unknown-unknown/release/deps/libcfg_if-954cfacc8a40931a.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libstd-b0efc82f64d03095.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libpanic_abort-4f93017645c0d252.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libunwind-c43a3d8cf78f9d5a.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liblibc-68373f2b6bc18151.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc_system-40a64b71ec5a8f18.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libdlmalloc-f6caffaf44cc60a0.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/liballoc-863f2b2485046aef.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcore-21433d3b7663b55b.rlib" "/Users/slowikow/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/wasm32-unknown-unknown/lib/libcompiler_builtins-bf63ca2c3bc4de53.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/slowikow/.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 `try-wasm`.

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

Versions:

cargo 1.28.0 (96a2c7d16 2018-07-13)

wasm-pack 0.4.2

rustc 1.28.0 (9634041f0 2018-07-30)

rustup 1.13.0 (ea9259c1b 2018-07-16)

$ rust-lldb --version
lldb-902.0.79.7
  Swift-4.1

[fitzgen]

This was an upstream rustc bug that has since been fixed in the latest nightlies

rustup update nightly

should do the trick for you!

If not, feel free to reopen :)

[fitzgen]

Looks like it still isn't fixed on OSX; follow https://github.com/rust-lang/rust/issues/53813#issuecomment-418050165 for updates