dtc: Enable more warnings

[Jon Loeliger]

> This patch turns on a bunch of extra gcc warnings, most of which are
> probably a good idea.  Of the new warnings -Wnested-externs and
> -Wstrict-prototypes need no code changes, we're already warning-clean.
> The remaining one, -Wmissing-prototypes requires trivial changes in
> some of the tests (making functions local).
> 
> This patch also rearranges the warnings flags into a separate make
> variable for convenience, and turns on -Werror, to really encourage
> people to keep the code warning-clean.
> 
> Signed-off-by: David Gibson <david at gibson.dropbear.id.au>

This patch didn't apply due to something wrong here:


> Index: dtc/Makefile
> ===================================================================
> --- dtc.orig/Makefile	2010-03-03 16:10:27.235986452 +1100
> +++ dtc/Makefile	2010-03-03 16:22:17.439987248 +1100
> @@ -16,7 +16,9 @@ LOCAL_VERSION =
>  CONFIG_LOCALVERSION =
>  
>  CPPFLAGS = -I libfdt
> -CFLAGS = -Wall -g -Os -fPIC -Wpointer-arith -Wcast-qual
> +WARNINGS = -Werror -Wall  -Wpointer-arith -Wcast-qual -Wnested-externs \
> +	-Wstrict-prototypes -Wmissing-prototypes
> +CFLAGS = -g -Os -fPIC -Werror $(WARNINGS)
>  
>  CPPFLAGS += -std=c99 -D_XOPEN_SOURCE -D_BSD_SOURCE
>  CFLAGS += -Werror


I think it is the extra CPPFLAGS line?  I dont seem to have that.

Thanks,
jdl