g++ linking fatal errors

[solled]

Hi, my files compile fine, but when I try to build them I get the following:

compserv1.55 g++ driver.o SymTabMgr.o SymTabEntry.o
Undefined first referenced
symbol in file
vtable for SymTabEntry SymTabEntry.o
vtable for SymTabMgr SymTabMgr.o
SymTabMgr::~SymTabMgr [in-charge]() driver.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

I don't even know where to begin. I don't have anything named "vtable". Thanks for helping.

 

[chipperMDW]

The vtable is something the compiler defines when you use virtual functions in your program. That should give you a place to start.

Did you maybe forget to declare a base class's destructor as virtual, then attempt to use it polymorphically?

That's just a guess; post some code that demonstrates how you're trying to use virtual functions for a better response.

 

[solled]

Yes--I forgot to implement the virtual descructors. It works now. Thanks.