PR c++/69884
	* c.opt (Wignored-attributes): New option.

	* pt.c (canonicalize_type_argument): Use OPT_Wignored_attributes.

	* doc/invoke.texi: Document -Wignored-attributes.

	* g++.dg/warn/Wignored-attributes-1.C: New test.
	* g++.dg/warn/Wignored-attributes-2.C: New test.

From-SVN: r234433