gcc gives an error on an unknown warning flag, but clang just gives a
warning. Upgrade the warning in clang to an error by activating
-Werror=unknown-warning-option if available.
Signed-off-by: Allan McRae <allan@archlinux.org>
With glibc-2.16, using -D_FORTIFY_SOURCE requires that optimization (-O)
be used or it will prodice a warning message. Enable -Werror in our
test for _FORTIFY_SOURCE support to catch when a users specifies CFLAGS
without optimization.
The line to set CFLAGS="" when no CFLAGS are specified (either due to
being unset or geniunely empty) is required as autoconf will use
"-O2 -g" for its tests by defult when CFLAGS is unset, but will not add
them to the CFLAGS used...
Signed-off-by: Allan McRae <allan@archlinux.org>
The -D_FORTIFY_SOURCE=2 define should be in CPPFLAGS and not CFLAGS
Signed-off-by: Allan McRae <allan@archlinux.org>
Signed-off-by: Dan McGee <dan@archlinux.org>
