Each Rust source file given to a target is considered a separate crate
root. There's a concept of a "main crate root", which is the `.rs` file
that is given to the final linker phase in CMake. Other Rust source file
in a target are built as rlib separately.
The project can still build `.rs` files into object files by setting the
Rust_EMIT property on the desired source file.
The TU for Rust is a crate, not per-source. `rustc` expects entry file
to TU as input, and cannot work with object files. So we need to have
one-step build/link in most cases, similar to what old Swift was doing.
Issue: #25492
Signed-off-by: Ayush Singh <ayush@beagleboard.org>
Baudouin Feildel
Ayush Singh