(guest, DragonFly cc 8.3 [DragonFly] Release/2019-02-22)
# cc -O2 -o gen_names gen_names.c
# cc -O2 -o fill2632 fill2632.c
# cc -O2 -o denseprobe denseprobe.c
# cc -O2 -o naturalprobe naturalprobe.c
(no diagnostics; all binaries linked)

# fix kernel build (X86_64_GENERIC, -Werror):
#   cd /usr/src && make -j6 nativekernel KERNCONF=X86_64_GENERIC && \
#       make installkernel KERNCONF=X86_64_GENERIC
iteration 1 (defer-in-loop variant): compiled clean, BUILD_SUCCESS,
  but validation tripped the repchange KKASSERT (see VERDICT.md 4).
final:   /root/kbuild2.log tail: BUILD_SUCCESS, 0 "error:" lines.