gcc/
	PR debug/23336
	* c-typeck.c (build_external_type): Mark used enum types.
	* dwarf2out.c (dwarf2out_abstract_function): Save and restore
	cfun also.
	(gen_subprogram_die): Whitespace fix.
gcc/cp/
	PR debug/23336
	* pt.c (tsubst_copy_and_build): Mark used enum types.
	* semantics.c (finish_id_expression): Likewise.
gcc/testsuite/
	PR debug/23336
	* lib/gcc-dg.exp (gcc-dg-debug-runtest): Suppress new tests
	at -g1.
	* gcc.dg/debug/enum-1.c, g++.dg/debug/enum-1.C,
	g++.dg/debug/enum-2.C: New.

From-SVN: r115853