Re: Need help on this error
Neo wrote:
I have a setup like
class A {
virtual void func1()=0;
....
}
class B {
virtual void func2()=0;
...
}
class C: public A, public B {
virtual void func1()=0;
virtual void func2()=0;
...
}
where below class C is "bidir_chan"
g++ -O3 -Wall -I. -I.. -I../../../include -L. -L..
-L../../../lib-linux -o run.x bidir_chan.o addr_generator.o main.o
-lsystemc -lm 2>&1 | c++filt
bidir_chan.o:bidir_chan.cpp:(.rdata$_ZTV10bidir_chan[vtable for
bidir_chan]+0x20): undefined reference to `bidir_chan::~bidir_chan()'
[..]
collect2: ld returned 1 exit status
what is this THUNK thing? I am using cygwin g++ ver 3.4.4-2
I don't think 'thunk' has anything to do with it. And the code you
posted doesn't have anything to do with it either. Your 'bidir_chan'
class declares a virtual destructor, but the compiler/linker cannot
find its definition.
A virtual function shall be defined or declared pure or both, but if
it is not pure, it must be defined. So, define the destructor. If
you don't know what it needs to do, just put the empty braces after
the declaration inside the class: {}. That should be enough.
V
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