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Description of problem:
It seems (I'm know authority on the C++ standard) that the destructor is
called one too many times when an object is passed by value to a function.
 When the user supplies their own copy constructor the destructor is called
only twice (which is what I expect).  The same behavior is seen with
rh6.2,7.0,7.1 as well as gcc 3.0.  The program in 'Steps to Reproduce'
demonstrates this.

How reproducible:
Always

Steps to Reproduce:
> cat destruct.cc 
#include <iostream>

using namespace std;

class a {
public:
   a() {
      cout << "Made an a." << '\n';
   }

   ~a() { 
      cout << "Destructor called." << '\n';
   }

#ifdef MY_CP_CON 
   a(const a& rhs) {
      cout << "copy con called" << '\n';
   }
#endif

};

void foo(a an_a) {}

int main(void) {
   a my_a;
   foo(my_a);
   return 0;
}


> g++ -o destruct destruct.cc && ./destruct
Made an a.
Destructor called.
Destructor called.
Destructor called.

> g++ -o destruct -DMY_CP_CON destruct.cc && ./destruct
Made an a.
copy con called
Destructor called.
Destructor called.


Actual Results:  Given in steps to reproduce.

Expected Results:  I'd expect 'g++ -o destruct destruct.cc && ./destruct'
to produce:

Made an a.
Destructor called.
Destructor called.

Additional info: