static member variables and DLLS

rk <>
Fri, 12 Aug 2011 12:31:27 -0700 (PDT)

I have run into similar problems before and have used convoluted
strategies to resolve the issue. This time I want to undertand this
problem better. I have the following scenario.

My dll has the files A.cpp, B.hpp and someother_file.cpp
/// A.hpp

EXPORT_CLASS class A : public B
      static const char *flag_;

      virtual const char* flag() { return A::flag_; }


/// B.hpp
    virtual const char * flag() = 0;

///// somother_file.cpp
#include "A.hpp"

void test(B& b)
   if( b->flag() == A::flag_ )
        //// Do something...

/// main.cpp
#include <factory.hpp>

int main(int argc, char *argv[])
    B* b = factory_create_a();

The issue is that the condition b->flag() == A::flag_ fails. I have
looked at the dissasembly and the addresses being compared are
different, i.e. b->flag() returns ad different address than A::flag_.

It would be great to get an Idea of what is going on here?

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