Rust 1.73 + emscripten 3.1.44 fails if using filesystem api #116655

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1. selassje

   added

   C-bugCategory: This is a bug.Category: This is a bug.

   on Oct 12, 2023
2. rustbot

   added

   needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triagingThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging

   on Oct 12, 2023
3. kleisauke commented on Oct 28, 2023

   

   kleisauke

   on Oct 28, 2023

   Last edited by kleisauke

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   This should be fixed in Emscripten 3.1.46, see: emscripten-core/emscripten#20123. Edit: this PR didn't help for Rust somehow, see comments below.

   Compatibility with Emscripten 3.1.44 and 3.1.45 is addressed in PR rust-lang/libc#3308, which is included in libc 0.2.149. This should be available in (the upcoming) Rust 1.75.0 (see #116527).
4. Noratrieb

   added

   O-wasmTarget: WASM (WebAssembly), http://webassembly.org/Target: WASM (WebAssembly), http://webassembly.org/

   T-libsRelevant to the library team, which will review and decide on the PR/issue.Relevant to the library team, which will review and decide on the PR/issue.

   and removed

   needs-triageThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triagingThis issue may need triage. Remove when done. See docs forge.rust-lang.org/release/issue-triaging

   on Oct 31, 2023
5. tari commented on Dec 6, 2023

   

   tari

   on Dec 6, 2023

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   I don't think newer emscripten fixed this, or if it was fixed it regressed again. I have emscripten 3.1.48 and the reproducer from the original report above still fails to link with the same undefined symbols.

   Building with rustc 1.75 (I tried 1.75.0-beta.5) does work, though.
6. lonsbio commented on Dec 14, 2023

   

   lonsbio

   on Dec 14, 2023

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   Just to add that using 1.75.0-beta.5 as advised by @tari was the only way to fix this issue for me

   rustc 1.75.0-beta.5 
   emcc 3.1.50
   
7. kleisauke commented on Dec 14, 2023

   

   kleisauke

   on Dec 14, 2023

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   Indeed, I can confirm that it's still broken on the latest stable version of Rust in combination with Emscripten 3.1.44 or higher. I've updated my previous comment.

   Details

   $ curl https://sh.rustup.rs -sSf | sh -s -- -y --profile minimal --target wasm32-unknown-emscripten
   $ source "$HOME/.cargo/env"
   $ rustc --version --verbose
   rustc 1.74.1 (a28077b28 2023-12-04)
   binary: rustc
   commit-hash: a28077b28a02b92985b3a3faecf92813155f1ea1
   commit-date: 2023-12-04
   host: x86_64-unknown-linux-gnu
   release: 1.74.1
   LLVM version: 17.0.4
   $ emcc -dumpversion
   3.1.51
   $ cat <<EOT > main.rs
   use std::{fs::File, io::Read};
   
   fn main() {
       let mut file = File::open("Hello world!").unwrap();
       let mut buf = Vec::new();
       let _ = file.read_to_end(&mut buf);
   }
   EOT
   $ rustc main.rs --target wasm32-unknown-emscripten
   error: linking with `emcc` failed: exit status: 1
   ...

   This is curious, as the above mentioned Emscripten PR is supposed to fix that, at least for C/C++ programs.
8. workingjubilee

   added

   O-emscriptenTarget: 50% off wasm32-unknown-musl. the savings come out of stdio.h, but hey, you get SDL!Target: 50% off wasm32-unknown-musl. the savings come out of stdio.h, but hey, you get SDL!

   on Oct 11, 2024