🚀 go-pugleaf

To: >Internet:bug-gcc@prep.ai.mit.edu
Hi!
	Found an optimizer bug and isolated it using
the following code.  This was done on a Sun SPARC
using gcc-2.2.2 and libg++-2.1.  The code works
when compiling without the "O" or "O2" switches
but does not work with optimization.  It seems
that the non-virtual function, printa, is
treated as a virtual function and the program
does a core dump when a nil pointer tries to
invoke the function.
---------------------
#include <iostream.h>
#define nil 0

class temp {
public:
	int a;
	temp();
	virtual void testa (temp*);

	void printa(ostream& os);
};

temp::temp(){
	a=0;
}

void temp::testa(temp* tmp){
	cout << tmp->a;
	cout << "Survived test\n";
}

void temp::printa(ostream& os){
	os << "this is a test";

	if (this == nil) {
		os << "This is nil\n";
	}
	else
	{
		this -> testa(this);
		os << "This is not nil\n";
	}
}

main(){
	temp aa;
	temp* aptr = nil;

	aa.printa(cout);
	aptr->printa(cout);
}
-----------------------
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     Thanks again!!!
     Gail Slemon, Expersoft
     phone #s: (619) 546-4100
               (800) 755-7011