Re: [Alephmodular-devel] Tag: xcode-transitional

[Br'fin <br...@ma...>]

On Nov 2, 2003, at 2:15 PM, Br'fin wrote:
>
> As it is, I haven't managed to get ZeroLink to work. I get one 
> undefined symbol relating to the destructor of ofstream of ostream ( 
> __ZTv0_n12_NSoD0Ev )  I don't know what is missing or how to debug and 
> fix this. I'd like to fix the problem for completeness sake and to 
> ensure it's not causing other problems during normal deployment builds 
> where everything is linked normally.
>

I've filed a bug with Apple about this issue and ZeroLink. I was able 
to reproduce the error in a quick form with the code at the end of this 
email.

Here is a URL that while it isn't the same error, does point out the 
trickiness of the setup.
http://gcc.gnu.org/ml/gcc-bugs/1999-02n/msg00293.html

They have complaints about problems with virtual dispatch from a 
virtual base class.
A situation where the below would fail on delete.
>   ostream* strm;
>   strm = new ofstream(fileName);
>   delete strm;

(ofstream has a virtual destructor, and has a virtual base class)

Some of what Alexander was doing under 10.3 was hitting a crash on the 
delete of our ofstream. So everything rings fairly similar. I'll have 
to leave ZeroLink off for now and deal with it later once I have more 
information.

-Jeremy Parsons

// This code compiles and runs fine in Deployment mode.
// However, when ZeroLink is enabled the program fails with the message:
// ZeroLink: unknown symbol '__ZTv0_n12_NSoD0Ev'

#include <fstream>
#include <iostream>
using namespace std;

class MyOFStream :
	public ofstream
{
	public:
		MyOFStream() { cout << "constructing MyOFStream" << endl; }
		~MyOFStream() { cout << "destructing MyOFStream" << endl; }
};

int main ()
{
   MyOFStream* s = new MyOFStream();
	delete s;
   return 0;
}