## build log (in-guest `make` against /usr/src/sys, warm obj)
## build host: DragonFly 6.5-DEVELOPMENT guest, X86_64_GENERIC
## command:  cd /tmp/df18_harness && make

$ make
Warning: Object directory not changed from original /tmp/df18_harness
cc  -O2 -pipe   -D_KERNEL -Wall -Wredundant-decls -Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes  -Wpointer-arith -Wcast-qual  -Wold-style-definition -Wmissing-include-dirs  -Wno-pointer-sign -Winit-self -Wundef -Wno-unused-but-set-variable -std=gnu11 -Werror -DKLD_MODULE -nostdinc  -I. -Idragonfly -I/tmp/df18_harness/forwarder_x86_64/include -Idragonfly/../include  -Wold-style-declaration -fno-common -ffreestanding -fno-stack-protector -fno-strict-aliasing -fno-strict-overflow -fno-asynchronous-unwind-tables -fno-omit-frame-pointer -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float -mno-fp-ret-in-387 -mindirect-branch=thunk-inline   -c harness.c
cc -Wl,--build-id=sha1 -nostdlib -Wl,--hash-style=sysv   -r -Wl,-d -o df18_harness.ko harness.o
$ ls -l df18_harness.ko
-rw-r--r--  1 root  wheel  6408 Jul 12 13:49 df18_harness.ko