the shared library demands virtual methods?!

[Felix von Leitner <leitner at math dot fu-berlin dot de>]

egcs-2.91.42 19980621 with GNU ld version 2.9.1 (with BFD 2.9.1.0.6)
shows this behavior:

  $ cat t.C
  class fubar {
  public:
    virtual void blubb()=0;
  };
  $ gcc -shared -o t.so t.C
  $ gcc -o t t.so
  /usr/lib/crt1.o: In function `_start':
  ../sysdeps/alpha/elf/start.S:35: undefined reference to `main'
  t.so: In function `global constructors keyed to t.C':
  t.C(.text+0x60): undefined reference to `fubar::blubb(void)'
  collect2: ld returned 1 exit status
  $

So it wants me to define the virtual method?!
Is it my fault, my binutils' fault, or egcs fault?

Can anyone reproduce this?
Any help is appreciated (please Cc to me)

Felix