dtc: Enable more warnings

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@gibson.dropbear.id.au>

1 files changed, 2 insertions, 2 deletions

diff --git a/tests/value-labels.c b/tests/value-labels.c
index c5aea8f..abe2721 100644
--- a/tests/value-labels.c
+++ b/tests/value-labels.c
@@ -59,8 +59,8 @@ struct val_label labels3[] = {
 	{ "end3", -1 },
 };
 
-void check_prop_labels(void *sohandle, void *fdt, const char *name,
-		       const struct val_label* labels, int n)
+static void check_prop_labels(void *sohandle, void *fdt, const char *name,
+			      const struct val_label* labels, int n)
 {
 	const struct fdt_property *prop;
 	const char *p;