Auto merge of #36874 - japaric:thumbs, r=alexcrichton
add Thumbs to the compiler this commit adds 4 new target definitions to the compiler for easier cross compilation to ARM Cortex-M devices. - `thumbv6m-none-eabi` - For the Cortex-M0, Cortex-M0+ and Cortex-M1 - This architecture doesn't have hardware support (instructions) for atomics. Hence, the `Atomic*` structs are not available for this target. - `thumbv7m-none-eabi` - For the Cortex-M3 - `thumbv7em-none-eabi` - For the FPU-less variants of the Cortex-M4 and Cortex-M7 - On this target, all the floating point operations will be lowered software routines (intrinsics) - `thumbv7em-none-eabihf` - For the variants of the Cortex-M4 and Cortex-M7 that do have a FPU. - On this target, all the floating point operations will be lowered to hardware instructions No binary releases of standard crates, like `core`, are planned for these targets because Cargo, in the future, will compile e.g. the `core` crate on the fly as part of the `cargo build` process. In the meantime, you'll have to compile the `core` crate yourself. [Xargo] is the easiest way to do that as in handles the compilation of `core` automatically and can be used just like Cargo: `xargo build --target thumbv6m-none-eabi` is all that's needed. [Xargo]: https://crates.io/crates/xargo --- cc @brson @alexcrichton
Showing
想要评论请 注册 或 登录