- Returns a version string such as “1.46.0 (04488afe3 2020-08-24)” when invoked by an in-tree tool.
target_feature = "..."cfgs for a variety of platform specific features (SSE, NEON etc.).
- Get the codegen backend based on the name and specified sysroot.
- Returns the version string for
rustcitself (which may be different from a tool version).
- Function pointer type that constructs a new CodegenBackend.