[Bug symtab/25833] New: [cc-with-gdb-index] FAIL: gdb.base/with.exp: basics: with language ada -- print g_s

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

https://sourceware.org/bugzilla/show_bug.cgi?id=25833

            Bug ID: 25833
           Summary: [cc-with-gdb-index] FAIL: gdb.base/with.exp: basics:
                    with language ada -- print g_s
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: symtab
          Assignee: unassigned at sourceware dot org
          Reporter: vries at gcc dot gnu.org
  Target Milestone: ---

When running test-case with.exp with target board cc-with-gdb-index, we have:
...
(gdb) PASS: gdb.base/with.exp: basics: show language
with language ada -- print g_s^M
'g_s' has unknown type; cast it to its declared type^M
(gdb) FAIL: gdb.base/with.exp: basics: with language ada -- print g_s
...

This scenario hits this case:
...
static void
dw2_map_matching_symbols
  (struct objfile *objfile,
   const lookup_name_info &name, domain_enum domain,
   int global,
   gdb::function_view<symbol_found_callback_ftype> callback,
   symbol_compare_ftype *ordered_compare)
{
  /* Used for Ada.  */
  struct dwarf2_per_objfile *dwarf2_per_objfile
    = get_dwarf2_per_objfile (objfile);

  if (dwarf2_per_objfile->index_table != nullptr)
    {
      /* Ada currently doesn't support .gdb_index (see PR24713).  We can get    
         here though if the current language is Ada for a non-Ada objfile       
         using GNU index.  As Ada does not look for non-Ada symbols this        
         function should just return.  */
      return;
    }
...

The reasoning for do nothing here is from a language perspective.

But the problem is that it makes gdb behaviour inconsistent between:
- having a .gdb_index section, and 
- having a .gdb_names section, or a partial symtab, or -readnow.

I think it's better to have consistent behaviour, and we should fix this.

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