can't run wasm-pack build on aarch64

[rolandoam]

🐛 Bug description

I'm trying to follow the tutorial at https://rustwasm.github.io/book/game-of-life/hello-world.html but I'm failing at the step wasm-pack build:

$ wasm-pack build
[INFO]: Checking for the Wasm target...
[INFO]: Compiling to Wasm...
   Compiling cfg-if v0.1.10
   Compiling wasm-bindgen v0.2.55
   Compiling console_error_panic_hook v0.1.6
   Compiling wasm-game-of-lift v0.1.0 (/workspace/personal/wasm-game-of-lift)
warning: function is never used: `set_panic_hook`
 --> src/utils.rs:1:1
  |
1 | pub fn set_panic_hook() {
  | ^^^^^^^^^^^^^^^^^^^^^^^
  |
  = note: `#[warn(dead_code)]` on by default

error: linker `rust-lld` not found
  |
  = note: No such file or directory (os error 2)

error: aborting due to previous error

error: could not compile `wasm-game-of-lift`.

To learn more, run the command again with --verbose.
Error: Compiling your crate to WebAssembly failed

🤔 Expected Behavior

It should build the project as explained in the tutorial

👟 Steps to reproduce

Follow the steps of the tutorial (https://rustwasm.github.io/book/game-of-life/hello-world.html) on an aarch64 machine.

🌍 Your environment

Include the relevant details of your environment.
wasm-pack version: 0.8.1
rustc version: 1.39.0
arch: aarch64

[csmoe]

It's a rustc issue actually, cc rust-lang/rust#52362

[rolandoam]

thanks. I read that thread before posting here, but it's not clear to me what's the actionable item: what's the path for me to got wasm-pack working on aarch64?

[rolandoam]

Here's what I've done so far:

• Install lld for my platform (aarch64)
• build clean
• RUSTFLAGS="-C linker=lld" wasm-pack build

It uses system lld instead of rust-lld, but it fails to link:

error: linking with `lld` failed: exit code: 1
  |
  = note: "lld" "lld" "-flavor" "wasm" "--no-threads" "-z" "stack-size=1048576" "--stack-first" "--allow-undefined" "--fatal-warnings" "--no-demangle" "--export-dynamic" "--no-entry" "-L" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/wasm_game_of_lift.wasm_game_of_lift.1m39vor3-cgu.0.rcgu.o" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/wasm_game_of_lift.wasm_game_of_lift.1m39vor3-cgu.1.rcgu.o" "-o" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/wasm_game_of_lift.wasm" "--export" "greet" "--export" "__wbindgen_describe___wbg_alert_277e04e9c7cf615d" "--export" "__wbindgen_describe_greet" "--export" "__wbindgen_realloc" "--export" "__wbindgen_drop_anyref_slice" "--export" "__wbindgen_free" "--export" "__wbindgen_anyref_heap_live_count_impl" "--export" "__wbindgen_anyref_table_dealloc" "--export" "__wbindgen_anyref_table_alloc" "--export" "__wbindgen_malloc" "--export" "__wbindgen_exn_store" "--export" "__wbindgen_describe___wbg_stack_558ba5917b466edd" "--export" "__wbindgen_describe___wbg_new_59cb74e423758ede" "--export" "__wbindgen_describe___wbg_error_4bb6c2a97407129a" "--export=__heap_base" "--export=__data_end" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/wasm_game_of_lift.1pkjenqo96m835m7.rcgu.o" "--gc-sections" "-O2" "-L" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps" "-L" "/workspace/personal/wasm-game-of-lift/target/release/deps" "-L" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/libconsole_error_panic_hook-0a516942002e613a.rlib" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/libwasm_bindgen-a3574d0798b5de2d.rlib" "/workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/libcfg_if-4bdfaf34eb74bdee.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libstd-c2131952dee6981b.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libpanic_abort-99d87686429b3c25.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libdlmalloc-b0e3b93b4b00306a.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libhashbrown-22547cbbd8b4170e.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/librustc_std_workspace_alloc-a3b0a997514d182c.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libbacktrace-6bea3698c14490a7.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/librustc_demangle-5e410385f7b0ce25.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libunwind-d22e73129408416c.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libcfg_if-6086fc8e9507d3a7.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/liblibc-03c593ffc10dc85c.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/liballoc-f45cf6dd5288fae6.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/librustc_std_workspace_core-52967bf557793cb8.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libcore-e8d7b2177f178b16.rlib" "/home/rolando/.rustup/toolchains/nightly-aarch64-unknown-linux-gnu/lib/rustlib/wasm32-unknown-unknown/lib/libcompiler_builtins-c75133791021e562.rlib" "--no-entry"
  = note: lld: error: /workspace/personal/wasm-game-of-lift/target/wasm32-unknown-unknown/release/deps/wasm_game_of_lift.wasm_game_of_lift.1m39vor3-cgu.1.rcgu.o: Bad section type

[Choons]

same problem here. I'm trying to get it working on an aarch64 Android phone using Termux & their Rust pkg. Been trying to read their source code and they bundle in Cargo as well as maybe wasm32-unknown-unknown(?), but do so in a rustlib/aarch64-linux-android/lib directory instead of a separate 'wasm32-unknown-unknown' folder. Also, despite apparently using rustup in the build process, rustup isn't installed with the pkg and you can't install it with rust already installed. I tried that adding the 'wasm32-unknown-unknown' folder manually process, but it wasn't compatible even though the version numbers matched.

I saw 'wasm-ld' is installed in my packages along with a bunch off llvm stuff and Googled around finally finding this little gem https://medium.com/@richardanaya/write-web-assembly-with-llvm-fbee788b2817 . I tried llc -mtriple=wasm32-unknown-unknown -O3 -filetype=obj main.ll -o main.o
wasm-ld main.o -o main.wasm --no-entry -allow-undefined on that IR snippet he gave and it worked outputting a nice small .wasm file. SO I know something in there knows about wasm32-unknown-unknown! Now I am just trying to figure out how to get it all working together. I'm a Rust/WebAssembly noob so I'm not clear on what/how to get rust code to that IR code stage so hopefully this helps someone and they can help me too.

[Choons]

I also found this exceptionally well-written guide about the inner workings of the rustc compiler that fills in a lot of gaps for me: https://rust-lang.github.io/rustc-guide/

[Choons]

I posted the same question to Termux issues as well and the solution (at least for me) was to do pkg install rust-std-wasm32 instead of their general rust pkg. Not sure if that helps the OP here, but maybe it helps others like me.

[rolandoam]

thanks @Choons ! that did the trick. Here's what I did:

• Uninstall local rust toolchain (rustup self uninstall)
• Install rust from OS package manager (apt install -t testing rustc)
• Install the wasm32 std lib the same way
• Follow the setup from the wasm wiki

It finally worked :) thanks! I'll close this issue.