tree 92d2c0fee03699a262080183cc2f4c756972a24e
parent 15ad6d862ec7f66dc00783798705a8db1c5d9aca
author David Gibson <david@gibson.dropbear.id.au> 1266915401 +1100
committer Jon Loeliger <jdl@jdl.com> 1266937488 -0600

Disallow re-use of the same label within a dts file

Currently, nothing will stop you from re-using the same label string
multiple times in a dts, e.g.:
	/ {
		samelabel: prop1 = "foo";
		samelabel: prop2 = "bar";
	};

or
	/ {
		samelabel: prop1 = "foo";
		samelabel: subnode {
		};
	};

When using node references by label, this could lead to confusing
results (with no warning), and in -Oasm mode will result in output
which the assembler will complain about (since it too will have
duplicate labels).

This patch, therefore, adds code to checks.c to give errors if you
attempt to re-use the same label.  It treats all labels (node,
property, and value) as residing in the same namespace, since the
assembler will treat them so for -Oasm mode.

Testcases for the new code are also added.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>