[Bug c++/52167] New: self-assignment should at least produce use-of-uninitialized warning

["darko.veberic at ung dot si" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52167

             Bug #: 52167
           Summary: self-assignment should at least produce
                    use-of-uninitialized warning
    Classification: Unclassified
           Product: gcc
           Version: 4.4.5
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: darko.veberic@ung.si


the following code gets compiled without any warnings (even with -Wall
-Wextra):

std::string foo(foo);

and the resulting code segfaults (clang++ is also silent on this but the code
throws std::length_error).

i am aware that the example is ridiculous but it comes from a large real-life
project and is possibly a result of negligent copy-paste operations, so at
least issuing a warning would be nice.

full example:


#include <iostream>
#include <string>
using namespace std;

int
main()
{
  const string foo(foo);
  cout << foo << endl;
  return 0;
}