$ cd /tmp/sipmod && make
cc -O2 -pipe -D_KERNEL -Wall ... -std=gnu11 -Werror -DKLD_MODULE -nostdinc \
   -mcmodel=kernel -mno-red-zone -mno-mmx -mno-sse -msoft-float ... -c trigger.c
cc ... -c siphash_test.c
cc -Wl,--build-id=sha1 -nostdlib -Wl,--hash-style=sysv -r -Wl,-d -o siphashtest.ko trigger.o siphash_test.o
-rw-r--r-- 1 root wheel 4392 Sep 15 01:51 siphashtest.ko
BUILD OK (unmodified sys/crypto/siphash/siphash_test.c, md5 3b580668a665816235b2c715bb293734)
Fixed variant built identically from siphash_test_fixed.c -> siphashtest_fixed.ko