$ scp funsetown_race.c dfbsd-maxx:/tmp/poc2751/
$ cc -O2 -pthread -o funsetown_race funsetown_race.c
BUILD_OK
$ scp funsetown_race2.c dfbsd-maxx:/tmp/poc2751/
$ cc -O2 -pthread -o fr2 funsetown_race2.c
BUILD_OK
$ scp funsetown_race3.c dfbsd-maxx:/tmp/poc2751/
$ cc -O2 -pthread -o fr3 funsetown_race3.c
BUILD_OK
(no warnings on any of the three builds)