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2013-06-13T17:40:50.037
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2017-05-23T12:28:58.643
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After discussion: Here a description of what happened: If you use gcc and you have two files (lets say <code>f1.c</code> and <code>f2.c</code>), and in both files you declare: <pre><code>int myGlobalVariable; </code></pre> Then the following will happen: <ul> <li>When compiling <code>f1.c</code> into <code>f1.o</code>, the object file will reserve space for <code>myGlobalVariable</code>.</li> <li>When compiling <code>f2.c</code> into <code>f2.o</code>, the object file will also reserve space for <code>myGlobalVariable</code>.</li> <li>When you link both object files together, the linker will detect that there are two variables called <code>myGlobalVariable</code> and will merge these variables together.</li> </ul> Now it seems the <code>nvcc</code> compiler/linker is not able to merge these variables. The problem was, that the file <code>ILS.h</code> declares <code><some type> p_instanceFragments;</code>. Because <code>ILS.h</code> is included into both <code>ILS.cu</code> and <code>Consensus.cu</code>, you get this variable twice and <code>nvcc</code> complains when it has to link the application. The solution is to declare <code>extern <some type> p_instanceFragments;</code> in <code>ILS.h</code> and then to define <code><some type> p_instanceFragments;</code> either in <code>ILS.cu</code> or <code>Consensus.cu</code> (not in both). The question <a href="https://stackoverflow.com/questions/1433204/what-are-extern-variables-in-c/1433387">What are extern variables in C</a> has a rather extensive answer explaining all of this in detail.
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