What is the "rustc_binary.wasm" file?

[RealSput]

Hello,
I am looking for the "rustc_binary.wasm" file, but could not find it anywhere. Where could I find it?
Thanks

[bjorn3]

This is a version of rustc I compiled to wasm using several patches. I only have the file locally. I can share it, but I lost the associated sysroot at some point, so I'm not sure how useful it would be.

[RealSput]

I would be happy if you could share it. I have attempted to compile it but it always errors, e.g the wasm32_unknown_wasi target wasn't found.

[bjorn3]

rust-lang/miri#722 has the rough procedure necessary for compiling, but it's been a while so things probably changed. In any case here is the compressed file: rustc_binary.wasm.gz If I recall correctly it uses https://github.com/bjorn3/rustc_codegen_cranelift/ as codegen backend, but as I don't recall which commit I built it from, I don't think it will be easy to find the right version of the standard library to build. I believe I patched out the version check, but compiling the standard library with a version that deviates too much will cause crashes or other weird behavior.

[RealSput]

I couldn't find how to compile it, could you link me to a comment (or multiple) with instructions? I still get the target "wasm32_unknown_wasi" not found error.

[bjorn3]

Roughly rust-lang/miri#722 (comment). It will need changes to adapt to rustc changes that happened since, but I don't knpw which changes exactly.

[RealSput]

I now get this error:

error: toolchain `66ec64ccf31883cd2c28d045912a76179c0c6ed2` doesn't exist in any channel

How could it be fixed?

[bjorn3]

CI artifacts for arbitrary commits are only kept for a limited period. You can either build that commit yourself or try to update the instructions for a newer version. I can't help further in the near future unfortunately.

[bjorn3]

Fixed the rustc example in #28 and provided a precompiled rustc wasm executable at rust-lang/miri#722 (comment).

[bjorn3]

Closing as there is now a working precompiled rustc wasm executable available.

[RealSput]

Closing as there is now a working precompiled rustc wasm executable available.

Where?

[bjorn3]

rust-lang/miri#722 (comment) contains the links.