PR debug/41828
	* cp-lang.c (cxx_dwarf_name): Return NULL instead of
	<anonymous ...> for anonymous aggregate names.

	* dwarf2out.c (add_pubname, add_pubtype, generic_parameter_die,
	add_name_and_src_coords_attributes, gen_namespace_die,
	dwarf2out_set_name): Handle dwarf2_name returning NULL.

	* g++.dg/debug/dwarf2/anonname1.C: New test.

From-SVN: r153568