Emscripten compilation is failing

[chris-morgan]

Latest nightly build of rustc, fresh installation of Empscripten, Windows 10, 64-bit.

Given this basic hello.rs:

fn main() { println!("Hello, Emscripten!"); }

This is what I get when I try to compile it with Emscripten:

C:\Users\me\AppData\Local\Temp>rustc --target=wasm32-unknown-emscripten hello.rs -C linker=emcc.bat
error: linking with `emcc.bat` failed: exit code: 1
  |
  = note: "emcc.bat" "-L" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib" "hello.0.o" "-o" "hello.js" "-Wl,--gc-sections" "-nodefaultlibs" "-L" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib" "-Wl,-Bstatic" "-Wl,-Bdynamic" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libstd-17342542cc541012.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\librand-46ed9b788a6928f6.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libcollections-e32369d7fef31fbf.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libstd_unicode-7f34decaf2f17f36.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libpanic_unwind-f78756b576499725.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libunwind-11f7709e0c71505b.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\liballoc-24699c1ddb055eb0.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\liballoc_system-3e467e865c8fa572.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\liblibc-60365c932e50e382.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libcore-d9873b515905cac5.rlib" "C:\\Users\\me\\.rustup\\toolchains\\nightly-x86_64-pc-windows-msvc\\lib\\rustlib\\wasm32-unknown-emscripten\\lib\\libcompiler_builtins-e428224f6caf212a.rlib" "-l" "c" "-s" "BINARYEN=1" "-s" "ERROR_ON_UNDEFINED_SYMBOLS=1"
  = note: WARNING:root:Assigning a non-existent settings attribute "BINARYEN"
WARNING:root: - perhaps a typo in emcc's  -s X=Y  notation?
WARNING:root: - (see src/settings.js for valid values)
error: Unknown attribute kind (52)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Invalid type for value
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (52)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Invalid type for value
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (48)
error: Unknown attribute kind (52)
Traceback (most recent call last):
  File "C:\Program Files\Emscripten\emscripten\1.35.0\\emcc", line 1309, in <module>
    final = shared.Building.llvm_opt(final, link_opts, DEFAULT_FINAL)
  File "C:\Program Files\Emscripten\emscripten\1.35.0\tools\shared.py", line 1471, in llvm_opt
    assert os.path.exists(target), 'Failed to run llvm optimizations: ' + output
AssertionError: Failed to run llvm optimizations:


error: aborting due to previous error

/cc @kripken; not sure if this should be here or in https://github.com/kripken/emscripten.

[kripken]

One possibility is the emscripten version is too old. We actually just updated it yesterday, so that should fix it if that's the issue. You should see emcc -v say the version is 1.37.0.

[chicoxyzzy]

Same error on portable Emscripten SDK for OS X.
@kripken you are right, emcc is 1.35.0

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 1.35.0
clang version 3.7.0 (https://github.com/kripken/emscripten-fastcomp-clang dbe68fecd03d6f646bd075963c3cc0e7130e5767) (https://github.com/kripken/emscripten-fastcomp 4e83be90903250ec5142edc57971ed4c633c5e25)
Target: x86_64-apple-darwin16.4.0
Thread model: posix
INFO:root:(Emscripten: Running sanity checks)

is there a way to update emcc right from Portable SDK?

[chicoxyzzy]

also I see 1.37.0 as latest but emsdk install latest installs 1.35.0

➜  emsdk_portable ./emsdk update
Downloading: /Users/Chico/c0d1n9/emsdk_portable/zips/emsdk_unix_update.tar.gz from https://s3.amazonaws.com/mozilla-games/emscripten/packages/emsdk_unix_update.tar.gz
Unpacking '/Users/Chico/c0d1n9/emsdk_portable/zips/emsdk_unix_update.tar.gz' to '/Users/Chico/c0d1n9/emsdk_portable'
x emscripten-tags.txt
x emsdk
x emsdk_env.sh
x emsdk_manifest.json
x README.md
Fetching all tags from Emscripten Github repository...
Done. 87 tagged releases available, latest is 1.37.0.

➜  emsdk_portable ./emsdk install latest
Installing SDK 'sdk-1.35.0-64bit'..
Installing tool 'clang-e1.35.0-64bit'..
The contents of file 'emscripten-clang_e1.35.0.tar.gz' already exist in destination '/Users/Chico/c0d1n9/emsdk_portable/clang/e1.35.0_64bit', skipping.
Done installing tool 'clang-e1.35.0-64bit'.
Installing tool 'node-4.1.1-64bit'..
The contents of file 'node-v4.1.1-darwin-x64.tar.gz' already exist in destination '/Users/Chico/c0d1n9/emsdk_portable/node/4.1.1_64bit', skipping.
Done installing tool 'node-4.1.1-64bit'.
Installing tool 'emscripten-1.35.0'..
The contents of file 'emscripten-1.35.0.tar.gz' already exist in destination '/Users/Chico/c0d1n9/emsdk_portable/emscripten/1.35.0', skipping.
Done installing tool 'emscripten-1.35.0'.
Done installing SDK 'sdk-1.35.0-64bit'.

[kripken]

Strange, maybe a bug in the emsdk? cc @juj

[chicoxyzzy]

Solution is emsdk install sdk-incoming-64bit. It will compile 1.37.0 from sources.

[sheldon]

Heya

I can confirm there's a bug somehow in emsdk. Update says 1.37.1 is latest, but installing latest stays on 1.35.

PS hello_rust_emscripten> emsdk update
Downloading: C:/Program Files/Emscripten/zips/emsdk_windows_update.zip from https://s3.amazonaws.com/mozilla-games/emscripten/packages/emsdk_windows_update.zip
Unpacking 'C:/Program Files/Emscripten/zips/emsdk_windows_update.zip' to 'C:/Program Files/Emscripten'
Fetching all tags from Emscripten Github repository...
Done. 88 tagged releases available, latest is 1.37.1.
PS hello_rust_emscripten> emsdk install latest
Installing SDK 'sdk-1.35.0-64bit'..
Installing tool 'clang-e1.35.0-64bit'..
The contents of file 'emscripten-clang_e1.35.0.zip' already exist in destination 'C:/Program Files/Emscripten/clang/e1.35.0_64bit', skipping.
Done installing tool 'clang-e1.35.0-64bit'.
Installing tool 'node-4.1.1-64bit'..
The contents of file 'node_4.1.1_64bit.zip' already exist in destination 'C:/Program Files/Emscripten/node/4.1.1_64bit', skipping.
Done installing tool 'node-4.1.1-64bit'.
Installing tool 'python-2.7.5.3-64bit'..
The contents of file 'python_2.7.5.3_64bit.zip' already exist in destination 'C:/Program Files/Emscripten/python/2.7.5.3_64bit', skipping.
Done installing tool 'python-2.7.5.3-64bit'.
Installing tool 'emscripten-1.35.0'..
The contents of file 'emscripten-1.35.0.zip' already exist in destination 'C:/Program Files/Emscripten/emscripten/1.35.0', skipping.
Done installing tool 'emscripten-1.35.0'.
Done installing SDK 'sdk-1.35.0-64bit'.
PS hello_rust_emscripten>

[chicoxyzzy]

@sheldon there are no pre-built binaries for versions >1.35.0. Try emsdk install sdk-incoming-64bit instead. It will build 1.37.1 for you.

[sheldon]

thanks, running it now, just wanted to let you know it's not just you 😄

[RReverser]

@chicoxyzzy Thanks, that fixed issue for me on Windows.

[brson]

Thanks for the help @kripken, @chicoxyzzy. Does upgrading emcc fix the issue for you @chris-morgan?

Seems like there's nothing to be done here Rust side.

[sheldon]

I can confirm this worked perfectly for asmjs compilation. All good to close 👍