The current code only adds -Wall and only for gcc.
Automake reserves the use of CPPFLAGS for the user to override
on the command line.
This also breaks the option --enable-strict-compilation
The variable CWARNFLAGS contains the complete set of warnings
and is platform sensitive.
Signed-off-by: Gaetan Nadon <memsize@videotron.ca>
Signed-off-by: Dave Airlie <airlied@redhat.com>