cc -O2 -Wall -o wrap_demo wrap_demo.c (guest DragonFly 6.5-DEVELOPMENT, cc -> clang)
cc 8.3 [DragonFly] Release/2019-02-22
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64