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POUndefined reference problem when dynamic library is used
 

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  1. POUndefined reference problem when dynamic library is used
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    <p>I was reading about static and dynamic libraries. To explore more I created three files 2 <code>.cpp</code> files and 1 <code>.h</code> file</p> <p><code>demo.h</code></p> <pre><code> class demo { int a; public: demo(); demo(const demo&amp;); demo&amp; operator=(const demo&amp;); ~demo(); }; </code></pre> <p><code>demo.cpp</code></p> <pre><code>#include "demo.h" #include &lt;iostream&gt; demo::demo():a() { std::cout&lt;&lt;"\nInside default constructor\n"; } demo::demo(const demo&amp;k) { this-&gt;a=k.a; std::cout&lt;&lt;"\nInside copy constructor\n"; } demo&amp; demo::operator=(const demo&amp;k) { this-&gt;a=k.a; std::cout&lt;&lt;"\nInside copy assignment operator\n"; return *this; } demo::~demo() { std::cout&lt;&lt;"\nInside destructor\n"; } </code></pre> <p><code>main.cpp</code></p> <pre><code>#include "demo.h" int main() { demo d; demo d1=d; demo d2; d2=d; } </code></pre> <p>Now I created two object files :<code>demo.o</code> and <code>main.o</code> using <code>g++ -c demo.cpp</code> and <code>g++ -c main.cpp</code> and then created a static library using <code>ar cr demo.a demo.o main.o</code></p> <p>I also created a dynamic library using <code>g++ -shared demo.o main.o -o demo.dll</code></p> <p>Now when I use my static library(<code>g++ demo.a -o demo</code>) to create an executable everything goes fine. But when I use my dynamic library to create an executable I get an error <code>Undefined reference to main</code> I have used the following command to create an executable <code>g++ demo.dll -o demo</code>.</p> <p>When I use <code>g++ main.cpp -o demo demo.dll</code> everything goes fine, why?</p> <p>Where am I wrong?</p>
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    1. USPrasoon Saurav
    1. USPrasoon Saurav
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      1. VTUpMod
    2. VO
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      1. VTUpMod
    1. COIt works for me. Could you post your makefile, if you use one? And what happens when you try making something even simpler from a shared library, like helloWorld, or `int main(){return(0);}`?
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      1. POUndefined reference problem when dynamic library is used
      1. USBeta
 

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