I think it could make sense to have cc automatically set -fsanitize=address, when the new target x86_64-unknown-linux-gnuasan is selected in Rust. This would make enabling ASAN in mixed code bases incredibly easy. And I think this would be what the user intends in every case when selecting the target.

I wanted to open a PR for this, but I am too unfamiliar with the code base to do it properly