Simple program fails to link - what am I doing wrong?

[Denis Koroskin]

On Thu, 12 Nov 2009 20:22:56 +0300, Mike Hearn <mike at plan99.net> wrote:

> I have a feeling this is a real simple problem. What does  
> _D4test7MyClass1bMFZv demangle to?
>
> class MyClass {
>   int a;
>   void b();
> }
>
>
> int main() {
>   MyClass c;
>   return 0;
> }
>
> $ dmd -v -run test.d
> parse     test
> importall test
> import     
> object	(/home/hearn/d/dmd2/linux/bin/../../src/druntime/import/object.di)
> semantic  test
> semantic2 test
> semantic3 test
> code      test
> function  main
> gcc test.o -o test -m32 -Xlinker -L/home/hearn/d/dmd2/linux/bin/../lib  
> -lphobos2 -lpthread -lm
> test.o:(.rodata+0x34): undefined reference to `_D4test7MyClass1bMFZv'
> collect2: ld returned 1 exit status
> --- errorlevel 1
>

Function MyClass.b is not implemented (but is referenced, because it is  
put into a virtual function table).