Different linking behavior between g++ 4.5.2 and 4.6.1

[Carlo Pinciroli]

Dear forum,

I have a problem with linking of a program I have wrote. Instead of giving
you the entire program, which is pretty large, I have prepared a basic
example that you can find attached to this message. The example uses CMake
to compile.

I have three files:

===== LIB2.CPP =====
#include <iostream>
class Lib2 {
public:
  Lib2() {
    std::cout << "Lib2" << std::endl;
  }
};
Lib2 lib2;

===== LIB1.CPP =====
#include <iostream>
class Lib1 {
  Lib1() {
    std::cout << "Lib1" << std::endl;
  }
};

===== MAIN.CPP ====
#include <iostream>
int main() {
  std::cout << "Ciao" << std::endl;
  return 0;
}

The file lib2.cpp is compiled into a dynamic library called lib2. The file
lib1.cpp is compiled into a dynamic library called lib1 and that links to
lib2. Finally, main.cpp is compiled into an executable that links to lib1.
The dependencies are thus:

lib2 --> lib1 --> testing

Now: if I compile the program with g++ 4.5.2, the programs outputs:

Lib2
Ciao

whereas if I compile with g++ 4.6.1, the program outputs:

Ciao

For me this is a problem, as my program depends on the behavior of g++
4.5.2. I would like to ask you if:

1. this is a new feature - in which case, how do fix the problem?
2. this is a known bug - in which case I apologize for asking, but I
couldn't find it in the bug list.

Thanks a lot in advance for your help.

Cheers,
Carlo


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