klibc does not provide the stack smashing protection library components, so you end up with undefined _stack_check functions. Consequently, it should have -fno-stack-protector. Reproducible: Always Steps to Reproduce: 1. Compile v86d with CFLAGS="-fstack-protector-all" Actual Results: v86d fails to link. Expected Results: v86d links fine because it can't use stack-protector since klibc doesn't provide the library portions.
This should now be fixed in CVS. Thanks for reporting the problem.