1 // GROUPS passed copy-ctors
3 This report is for GCC 2.3.3 running on a Sun/4. The bug is that when
4 a class instance is passed-by-value, GCC does not correctly copy the value.
5 At the end of this report is an example program that demonstrates the bug.
13 and in fact does for IBM's xlC C++. However, for GCC 2.3.3, it fails
14 to print the second line ["copy A('x')"], which indicates that it failed
15 to call the copy-constructor for class A when it should have. Below is a
16 typescript that lists the program, shows how I compiled it, and shows the
20 extern "C" int printf (const char *, ...);
21 extern "C" void exit (int);
35 class A { // Class with explicit & instrumented copy-constructor and destructor.
38 A( const char * id1 ) : id(id1) { die (1); }
41 A( const A& a ) : id(a.id) { die (2); }
44 ~A() { count++; if (count != 3 && count != 4) die (-1); }
47 class X { // Class without explicit copy-constructor
51 X( const char * id ) : a(id) {}
54 void Func( X x ) { // Function with call-by-value argument
59 X x("x"); // Construct instance of x.
61 // The next line should call the copy-constructor for X since x is
62 // being passed by value. For GCC 2.3.3 on a Sun/4, it does not.