I'm tring to port a large C++ program to MacOS X 10.2, and I discovered
a bad interaction between the "interface" pragma and abstract methods.
For example, here is a trivial C++ header file:
[cheetah:~/tmp] jhr% cat t.h
#pragma interface
class Foo {
public:
virtual void m () = 0;
Foo();
virtual ~Foo();
};
and a C++ source file that uses it:
[cheetah:~/tmp] jhr% cat t.cxx
#pragma implementation
#include "t.h"
Foo::Foo () { }
If I try to compile t.cxx, I get the following error message:
[cheetah:~/tmp] jhr% c++ -c t.cxx
t.h:3: storage size of `_ZTI3Foo' isn't known
but if I comment out the "interface" pragma in t.h, then the example
compiles.
Is this a known bug with gcc 3.1, or is it a feature?
- John
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