cc  -O2 -pipe -I/sys/dev/drm/include -D_KERNEL ... -std=gnu11 -Werror -DKLD_MODULE -nostdinc ... -c gmuxtrig.c
cc -Wl,--build-id=sha1 -nostdlib -Wl,--hash-style=sysv   -r -Wl,-d -o gmuxtrig.ko gmuxtrig.o