For coreboot, I started making gcc (we use our own toolchain for various reasons already) emit some link-time error inducing symbol, because their current appro

For coreboot, I started making gcc (we use our own toolchain for various reasons already) emit some link-time error inducing symbol, because their current approach (__builtin_trap()) is nice for undefined behavior in userspace programs that can segfault, but not for firmware that silently hangs. https://review.coreboot.org/14364 https://review.coreboot.org/14364