re PR debug/28063 (Dwarf no longer uses merged strings for DW_AT_comp_dir)
gcc/
PR debug/28063
* dwarf2out.c (prune_unused_types_prune): Move call to
prune_unused_types_update_strings to cover the parent DIE also.
gcc/testuite/
PR debug/28063
* gcc.dg/debug/dwarf2/dwarf-merge.c: New test.
* lib/target-supports.exp (get_compiler_messages): Add WANT_OUTPUT.
Optionally return assembly text. Update callers.
(check_no_compiler_messages): Update verbose messages.
(check_no_messages_and_pattern): New.
(check_effective_target_string_merging): New.
From-SVN: r115874