Compiling rust-horizon on Windows

[nemui]

Hello!
I was very happy to discover rust-horizon and related projects after tinkering with https://github.com/rust3ds for a couple of evenings.

Tried compiling on Windows following the guide at https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html, but running x.py build -i library/std results in an error:

Building stage0 std artifacts (x86_64-pc-windows-msvc -> x86_64-pc-windows-msvc)
   Compiling compiler_builtins v0.1.72
error[E0412]: cannot find type `c_char` in module `core::ffi`
  --> C:\Users\metap\.cargo\registry\src\github.com-1ecc6299db9ec823\compiler_builtins-0.1.72\src\mem\mod.rs:74:58
   |
74 |     pub unsafe extern "C" fn strlen(s: *const core::ffi::c_char) -> usize {
   |                                                          ^^^^^^ not found in `core::ffi`

For more information about this error, try `rustc --explain E0412`.
error: could not compile `compiler_builtins` due to previous error

Building master seems to be working fine, perhaps horizon-std needs some additional arguments/special config values?
Any pointers would be greatly appreciated!

[Meziu]

Right now no branch is fully usable, as we are preparing to push our changes to Rust’s master branch (which would make building much easier).

Still, if you want to try horizon-std with the examples we have in ctru-rs you will need to install the full 3ds-dev module from devkitPRO’s toolchain and build the stage2 rustc compiler (from rust-horizon). At that point you should add the rustc keyword (under the [build] category) in the .cargo/config.toml file and set it to the custom rustc you just built. Then you can use our cargo-3ds tool like a normal cargo tool and you are good to go.

Since neither our std, nor cargo-3ds, nor ctru-rs are released, the process is very cumbersome and requires the cloning of multiple repositories, plus some tinkering with the toolchain. Once everything is published, the process will look something like:

• Install devkitPRO‘s toolchain
• cargo install cargo-3ds
• cargo 3ds run

We are getting there though, so check out our progress 😃

[nemui]

Thank you for the detailed answer! I'd like to try the examples from ctru-rs, got devkitPRO/3ds-dev installed and sample programs running in Citra. Building rustc from rust-horizon is giving me trouble though; perhaps it's better to wait for the published versions of your std, cargo-3ds and ctru-rs and learn libctru in the meantime.
Looking forward to the published crates, and again - amazing work!

[Meziu]

You can have a look at libctru‘s examples in the meantime, knowing what’s underneath is very useful. Also, we aim to port most of those over, so you can compare the Rust code to the C code and see what’s going on.

[AzureMarker]

@nemui The most stable branches to use in this repo are feature/horizon-std and feature/horizon-threads (the first, plus thread support).

[AzureMarker]

Additionally, you can add your local rustc install to rustup to utilize the (more common) rust-toolchain file, or use rustup toolchain set override.

See https://rustc-dev-guide.rust-lang.org/building/how-to-build-and-run.html#creating-a-rustup-toolchain