[Bug mi/27770] crash with interpreter-exec

["vimacs.hacks at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27770

--- Comment #3 from vimacs.hacks at gmail dot com <vimacs.hacks at gmail dot com> ---
I seem to know why this can crash. In the following code:

std::unique_ptr<mi_ui_out>
mi_out_new (const char *mi_version)
{
  if (streq (mi_version, INTERP_MI4) ||  streq (mi_version, INTERP_MI))
    return std::make_unique<mi_ui_out> (4);

  if (streq (mi_version, INTERP_MI3))
    return std::make_unique<mi_ui_out> (3);

  if (streq (mi_version, INTERP_MI2))
    return std::make_unique<mi_ui_out> (2);

  return nullptr;
}

Different MI version makes a different mi_ui_out, so when -interpreter-exec
gives a different version than the one in command line, the ui_out object
cannot be found.

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