2018-09-13  Omar Sandoval  <osandov@osandov.com>
	    Tom de Vries  <tdevries@suse.de>

	PR debug/86985
	* dwarf2out.c (is_c): New function.
	(add_subscript_info): Add DW_AT_count of 0 for C zero-length arrays.

	* gcc.dg/guality/zero-length-array.c: New test.

Co-Authored-By: Tom de Vries <tdevries@suse.de>

From-SVN: r264267