[Bug symtab/30276] [gdb/symtab] function name is _Dmain instead of "D main"

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

https://sourceware.org/bugzilla/show_bug.cgi?id=30276

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #1)
> But I have no idea whether this is correct.  Maybe this needs to be handled
> somehow in dwarf2_physname instead?

In dwarf2_physname we do:
...
dwarf2_physname (name=0x364ce9b "D main", die=0x35deb80, cu=0x2bc90f0) at
/data/vries/gdb/src/gdb/dwarf2/read.c:7097
7097      struct objfile *objfile = cu->per_objfile->objfile;
(gdb) n
7098      const char *retval, *mangled = NULL, *canon = NULL;
(gdb) 
7099      int need_copy = 1;
(gdb) 
7103      if (!die_needs_namespace (die, cu))
(gdb) 
7106      if (cu->lang () != language_rust)
(gdb) 
7107        mangled = dw2_linkage_name (die, cu);
(gdb) 
7111      gdb::unique_xmalloc_ptr<char> demangled;
(gdb) 
7112      if (mangled != NULL)
(gdb) 
7114          if (cu->language_defn->store_sym_names_in_linkage_form_p ())
(gdb) 
7128              demangled = gdb_demangle (mangled, (DMGL_PARAMS | DMGL_ANSI
(gdb) 
7131          if (demangled)
(gdb) 
7135              canon = mangled;
(gdb) 
7136              need_copy = 0;
(gdb) 
7140      if (canon == NULL || check_physname)
(gdb) 
7168        retval = canon;
(gdb) 
7170      if (need_copy)
(gdb) 
7173      return retval;
(gdb) p retval
$8 = 0x364cea2 "_Dmain"
...

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