[Bug gdb/28681] New: Wrong pretty-printed unique_ptr value when using "finish"

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

https://sourceware.org/bugzilla/show_bug.cgi?id=28681

            Bug ID: 28681
           Summary: Wrong pretty-printed unique_ptr value when using
                    "finish"
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: simark at simark dot ca
  Target Milestone: ---

With this program:

---
#include <memory>

std::unique_ptr<int> foo()
{
  int *p = new int (0x1234);
  printf("In foo: %p\n", p);
  return std::unique_ptr<int> (p);
}

int main()
{
  auto ptr = foo ();
  printf("In main: %p\n", ptr.get());
  return 0;
}

---

$ ./gdb -q -iex "add-auto-load-safe-path /usr/share/gdb/auto-load" -iex
"add-auto-load-scripts-directory /usr/share/gdb/auto-load" -nx
--data-directory=data-directory a.out
Reading symbols from a.out...
(gdb) b foo
Breakpoint 1 at 0x11d9: file test.cpp, line 5.
(gdb) r
Starting program: /home/smarchi/build/binutils-gdb/gdb/a.out 

Breakpoint 1, foo () at test.cpp:5
5         int *p = new int (0x1234);
(gdb) finish
Run till exit from #0  foo () at test.cpp:5
In foo: 0x55555556aeb0
main () at test.cpp:13
13        printf("In main: %p\n", ptr.get());
Value returned is $1 = std::unique_ptr<int> = {get() = 0x7fffffffe130}
(gdb) n
In main: 0x55555556aeb0
14        return 0;
(gdb) p ptr
$2 = std::unique_ptr<int> = {get() = 0x55555556aeb0}


Notice how the value printed by finish doesn't match all other three printed
values.

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