The stencil is compiled with a separate tool and checked into the repository, so if the stencil didn't change there is no additional compile issue at all. This also means that the aforementioned tool should be able to resolve all relocations beforehand, and the exact method should be standardized in the ELF spec, so the tool only has to track the ELF spec, not the compiler. (In reality the tool would also do some cleanup jobs that are complier-dependent, of course.)