Function build_data::set_RUSTC_VERSION_SEMVER

pub fn set_RUSTC_VERSION_SEMVER()

Sets the RUSTC_VERSION_SEMVER to the dotted version number of the rustc used by the current build.

Call this from build.rs. Use env! in your main.rs to use the variable.

Example value: "1.53.0"

Executes the rustc command.

Panics

Panics if it fails to get the value from rustc.