[Bug symtab/29385] [gdb, debug-types, debug-names, dwarf-5] Support .debug_names section with TUs in .debug_info

["vries at gcc dot gnu.org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=29385

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
Tentative patch (in combination with patch mentioned in previous comment):
...
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 6c6ca96f8d9..8e82f464293 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -4736,13 +4736,16 @@ dwarf2_read_debug_names (dwarf2_per_objfile
*per_objfile)
     {
       /* We can only handle a single .debug_types when we have an
         index.  */
-      if (per_bfd->types.size () != 1)
+      if (per_bfd->types.size () > 1)
        {
          per_bfd->all_comp_units.clear ();
          return false;
        }

-      dwarf2_section_info *section = &per_bfd->types[0];
+      dwarf2_section_info *section
+       = (per_bfd->types.size () == 1
+          ? &per_bfd->types[0]
+          : &per_bfd->info);

       create_signatured_type_table_from_debug_names
        (per_objfile, *map, section, &per_bfd->abbrev);
...

Allows test-case gdb.cp/cpexprs-debug-types.exp to pass on target board
cc-with-debug-names/gdb:debug_flags=-gdwarf-5.

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