https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70676
--- Comment #6 from night_ghost at ykoctpa dot ru --- I reported not one case but suboptimal behavior while optimizing size - GCC optimization of sibling calls increases size of binary. There are a lot of such places in this code. And GCC never replaces call-ret sequence to jmp, relying on linkers optimizing by -relax. But including -relax flag often spoils the project to complete failure.