90164587dc
Add a thumbv4t-none-eabi target (cc @ketsuban, one of the few other Rust users who programs for GBA.) --- **EDIT:** This is now a more general `thumbv4t-none-eabi` PR! See [this comment](https://github.com/rust-lang/rust/pull/74419#issuecomment-660391579) --- Now that the PSP officially has an official target within Rust, well as the lead of the `gba` crate I can't _not_ add a GBA target as well. I know that the [target tier policy](https://github.com/rust-lang/rfcs/pull/2803) isn't ratified and official, but I'll use it as an outline (cc @joshtriplett): * Designated Developer: Lokathor * Naming consistent with any existing targets * Doesn't create Rust project legal issues. * No license issues * Uses the standard Apache/mit license. * Rust tooling users don't have to accept any new licensing requirements * Does not support hosting rust tooling. * Doesn't require linking in proprietary code to obtain a functional binary. However, you will need to do some post-build steps to turn the ELF file into a usable GBA ROM (either for an emulator or for the actual hardware). * This is a `no_std` environment, without even a standard global allocator, so this adds no new code to `alloc` or `std`. * The process of building for this target is documented in the `gba` crate ([link](https://rust-console.github.io/gba/development-setup.html)). Well, the docs there are currently a little out of date, they're back on using `cargo-xbuild`, but the crate docs there will get updated once this target is available. * This places no new burden on any other targets * Does not break any existing targets. I'm not fully confident in specifying the same linker script for all possible projects, so I'm currently just not giving a linker script at all, and users can continue to select their own linker script by using `-C` to provide a linker arg. I added the file, and added it to the `supported_targets!` macro usage, and I think that's all there is to do.
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