Bug with virtual base classes an exceptions.

[Kevin Atkinson]

The following code aborts on the assertion with gcc 2.95.1 and 2.96
20000214 but NOT with egcs 1.1.2:

#include <iostream>
#include <exception>
#include <cassert>

struct MyException : virtual public exception
{
  int value;
  MyException(int v) : value(v) {}
  ~MyException() {assert(value == 10);}
};

int main() {
   try {
     throw MyException(10);
   } catch (exception & e) {
     cerr << e.what() << endl;
   }
}

It will not abort if when the base class is non virtual or 
   } catch (exception & e) {
is changed to
   } catch (MyException & e) {


This creates a problem with my aspell package
( http://aspell.sourceforge.net ) as the exception heritage
used virtual base classes.  If you want to see the bug in action try
installing aspell compiled with the gcc 2.95.1 and type in this
  src/aspell -a --master=dkl
And you will get something like this.
Sorry, I can't read the file "/usr/local/lib/aspell/dkl".

I get this problem on intel-linux, sparc-solaris, and dec-alpha.

---
Kevin Atkinson
kevinatk@home.com
http://metalab.unc.edu/kevina/