make FindRust gracefully fail if rustc not found #111
Merged
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Motivation for this change is to be able to reuse the FindRust module in a more general setting to see if rust exists.
With this change, it should be able to be used by any other package and afterwards check Rust_FOUND of its existence.
Earlier a missing .cargo/bin/rustc would fail with
Now it prints a more descriptive errormessage, sets Rust_FOUND to false
and returns.
It also sets Rust_FOUND to true if a rust target is successfully created