[Bug gdb/31569] New: "finish" command loses typedef

["tromey at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31569

            Bug ID: 31569
           Summary: "finish" command loses typedef
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: tromey at sourceware dot org
  Target Milestone: ---

gcc has a "tree" typedef and a pretty-printer that
recognizes it.

While debugging gcc, I used "finish" and got:

(gdb) fini
Run till exit from #0  get_global_context () at
../../gcc/gcc/ada/gcc-interface/utils.cc:812
0x0000000001b0e800 in gnat_push_namespace (ns=<namespace_decl 0x7fffe9c32980
pck>) at ../../gcc/gcc/ada/gcc-interface/utils.cc:820
Value returned is $26 = (tree_node *) 0x7fffe9c0c168


However, this function is actually defined as:

static tree
get_global_context (void)
{
...


If I cast that value back to a tree, I get the pretty-printer output:

(gdb) p (tree) $
$28 = <translation_unit_decl 0x7fffe9c0c168 pck.ads>


I think this is a bug -- "finish" should result in a value that
uses the function's declared return type, so that pretty-printers
can see what they expect.

Arguably I guess this is a bug in gcc as well, since it should
probably recognize the underlying type and not the typedef.

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