Logic to detect rustc version is incomplete about cargo-llvm-cov HOT 3 CLOSED

In a build script, the RUSTC environment variable can be used for this purpose, but in a subcommand, the RUSTC environment variable has a different meaning.

If we need the major-minor-patch version of the toolchain (e.g., cargo-hack's --version-range), cargo --version --verbose is fine, but if we need the exact toolchain date of nightly rustc, cargo --version --verbose is not enough.

So I think the correct action here is just to remove this heuristic. (IICU, the way introduced in #79 should work well without rustc version-based heuristics.)

from cargo-llvm-cov.

So I think the correct action here is just to remove this heuristic. (IICU, the way introduced in #79 should work well without rustc version-based heuristics.)

In fact, it relies on information from rustc here as well, but that can be avoided.

from cargo-llvm-cov.

Oh, actually I can find the rustc binary based on the sysroot.

from cargo-llvm-cov.