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205d80c75a
FindRust is too clever by half. It tries to do rustup's job for it.
See b38551dde9 for how that can break.
So we simplify it, and only let it check three things:
- Where's rustc? Look in $PATH and ~/.cargo/bin
- Where's cargo? Look in $PATH and ~/.cargo/bin
- What is the rust target (because we pass it explicitly)?
If any of these aren't that simple, we'll ask the user to tell us,
by setting Rust_COMPILER, Rust_CARGO or Rust_CARGO_TARGET.
None of the other things are helpful to us - we do not support windows
or whatever a "unikraft" is, and if the rust version doesn't work
it'll print its own error.
We could add a rustc version check, but that will become less and less
useful because rustc versions since 1.56 (released October 2021) will check rust-version in
Cargo.toml. So even at this point it's only pretty old rust versions already.