[Bug c++/71069] New: Extend -Wnonnull-compare to address of reference

[eugene.zelenko at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71069

            Bug ID: 71069
           Summary: Extend -Wnonnull-compare to address of reference
           Product: gcc
           Version: 6.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: eugene.zelenko at gmail dot com
  Target Milestone: ---

I had crash in optimized build because pointer check is skipped in next
situation (null pointer is sneaked into container):

void setData( Data &data ) {
  _current_data = &data;
  if ( _current_data )
    _set_data.insert( _current_data );
}

I think will be good idea to report such situations in -Wnonnull-compare.