Stream: rust-toolchain

Topic: Rust compilation issues

Alexandru Ene (Jul 30 2020 at 15:35):

Is anyone experiencing this or am I having something broken on my setup? https://github.com/rust-lang/rust/issues/73278

Alex Crichton (Jul 30 2020 at 15:41):

@Alexandru Ene does the same issue happen with other runtimes? or just WAMR?

Alexandru Ene (Jul 30 2020 at 15:41):

Yes, any runtime has that issue, as basically the generated wasm binary doesn't import the things it should import for File::open() to work.

If I build it on OSX fd_prestat_get and another method is missing from the imports list (same build with wasm32-wasi as a target. On windows it generates the correct thing. I didn't try linux as I didn't have a machine, but it looks like cargo build --target wasm32-wasi generates different things on windows/osx at least.

Alexandru Ene (Jul 30 2020 at 15:44):

My follow-up comment has some more things I uncovered as I was debugging this.

Alex Crichton (Jul 30 2020 at 15:44):

hm so the platform differences are unexpected, but I'm otherwise a bit confused as to what the issue is

Alex Crichton (Jul 30 2020 at 15:45):

is file opening not working or is it just pulling in unexpected imports?

Alexandru Ene (Jul 30 2020 at 15:46):

No, so the generated file doesn't have the imports that it needs to have when building on OSX (the broken version). When building on windows, it imports as expected fd_prestat_get for the wasm32-wasi target

Alexandru Ene (Jul 30 2020 at 15:47):

I don't think the platforms should generate different binaries, at least not with regards to the WASI-related imports

Alex Crichton (Jul 30 2020 at 15:47):

so only if you compile the program from macos does the wasm not work?

Alexandru Ene (Jul 30 2020 at 15:47):

Yup

Alexandru Ene (Jul 30 2020 at 15:48):

Compiling the same exact code with the same compiler version on windows does work and generate the code that has the correct import fields on windows but not osx

Alex Crichton (Jul 30 2020 at 15:49):

ok I'll try to dig in

Alexandru Ene (Jul 30 2020 at 15:50):

Yeah if you have these in the generated .wasm then it means that it correctly compiled .

  (import "wasi_snapshot_preview1" "fd_prestat_get" (func $__wasi_fd_prestat_get (type $t2)))
  (import "wasi_snapshot_preview1" "fd_prestat_dir_name" (func $__wasi_fd_prestat_dir_name (type $t8)))

Alex Crichton (Jul 30 2020 at 15:52):

that program works for me when compiled from macos/linux/windows

Alex Crichton (Jul 30 2020 at 15:53):

all three platforms produce the same exact wasm file byte-for-byte

Alex Crichton (Jul 30 2020 at 15:54):

so I can't reproduce?

Alexandru Ene (Jul 30 2020 at 15:55):

:frown: I did suspect something's strange on my setup then

Alexandru Ene (Jul 30 2020 at 15:55):

Might as well close the issue I think if nobody else can repro it

Alexandru Ene (Jul 30 2020 at 16:04):

Thanks for the help and test @Alex Crichton

Last updated: Oct 23 2024 at 20:03 UTC