Add a Rust make helper that collects crate input files, and use it for
the Rust hello and slint examples.
This makes the generated Rust static libraries depend on the crate
sources, manifests, build scripts. Hook the libraries into both context
and all, so re-running make after editing Rust inputs rebuilds the crate.
Signed-off-by: Shoji Tokunaga <toku@mac.com>
Build Rust applictions with cargo is the most commn way,
and it's more easy to cooporate with Rust ecosystem.
This example shows how to use cargo to build a simple hello world
application.
And please notice that you need to install nighly version of rustc
to support this feature, any version after https://github.com/rust-lang/rust/pull/127755
is merged, can use NuttX as cargo target directly.
Build
-----
To build hello_rust_cargo application, you can use any target that based
on RISCV32IMAC, for example:
```
cmake -B build -DBOARD_CONFIG=rv-virt:nsh -GNinja .
```
And disable ARCH_FPU in menuconfig, since the hard coded target triple
in this demo is `riscv32imac`.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
