9af3865dec
linker: Report linker flavors incompatible with the current target The linker flavor is checked for target compatibility even if linker is never used (e.g. we are producing a rlib). If it causes trouble, we can move the check to `link.rs` so it will run if the linker (flavor) is actually used. And also feature gate explicitly specifying linker flavors for tier 3 targets. The next step is supporting all the internal linker flavors in user-visible interfaces (command line and json).
rustc_target contains some very low-level details that are
specific to different compilation targets and so forth.
For more information about how rustc works, see the rustc dev guide.