GCC has issues with literal -1.
Link: <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119011>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
CFLAGS="$CFLAGS -Werror=implicit-int"
CFLAGS="$CFLAGS -Werror=incompatible-pointer-types"
CFLAGS="$CFLAGS -Werror=int-conversion"
-CFLAGS="$CFLAGS -Werror=sign-compare"
CFLAGS="$CFLAGS -Werror=sizeof-pointer-div"
CFLAGS="$CFLAGS -Werror=unused-but-set-parameter"
CFLAGS="$CFLAGS -Werror=unused-function"