[Bug debug/33537] New: [4.0/4.1/4.2/4.3 regression] C++ arguments passed by invisible reference have wrong type

[drow at gcc dot gnu dot org]

Compile the code below using g++ -g, load the object into gdb, and 'ptype foo'.
 You will see that the type of foo is 'int (Obj &)'.  If this function is
called from GDB, and the called function modifies its argument, it will end up
modifying the original copy.  It's supposed to get a temporary copy.

This changed sometime between g++ 3.3 and g++ 4.0.

class Obj {
public:
  Obj ();
  Obj (const Obj &);
  ~Obj ();
  int var[2];
};

int foo (Obj arg)
{
  return arg.var[0] + arg.var[1];
}

int main() { return 0; }

Obj::Obj ()
{
  var[0] = 1;
  var[1] = 2;
}

Obj::Obj (const Obj &obj)
{
  var[0] = obj.var[0];
  var[1] = obj.var[1];
}

Obj::~Obj ()
{

}


-- 
           Summary: [4.0/4.1/4.2/4.3 regression] C++ arguments passed by
                    invisible reference have wrong type
           Product: gcc
           Version: 4.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: drow at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33537