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POBest code for compiling static const int = X in VS2008 and GCC
 

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  1. POBest code for compiling static const int = X in VS2008 and GCC
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    <p>I have run into a problem while writing C++ code that needs to compile in Visual Studio 2008 and in GCC 4.6 (and needs to also compile back to GCC 3.4): <code>static const int</code> class members.</p> <p><a href="https://stackoverflow.com/questions/5391973/undefined-reference-to-static-const-int">Other</a> <a href="https://stackoverflow.com/questions/1312241/using-a-static-const-int-in-a-struct-class">questions</a> <a href="https://stackoverflow.com/questions/5508182/static-const-int-causes-linking-error-undefined-reference">have</a> <a href="https://stackoverflow.com/questions/6138895/weird-linker-problem-with-static-const-class-members">covered</a> the rules required of static const int class members. In particular, the standard and GCC require that the variable have a definition in one and only one object file.</p> <p>However, Visual Studio creates a LNK2005 error when compiling code (in Debug mode) that does include a definition in a .cpp file.</p> <p>Some methods I am trying to decide between are:</p> <ul> <li>Initialize it with a value in the .cpp file, not the header.</li> <li>Use the preprocessor to remove the definition for MSVC.</li> <li>Replace it with an enum.</li> <li>Replace it with a macro.</li> </ul> <p>The last two options are not appealing and I probably won't use either one. The first option is easy -- but I <em>like</em> having the value in the header.</p> <p>What I am looking for in the answers is a good looking, best practice method to structure the code to make both GCC and MSVC happy at the same time. I am hoping for something wonderfully beautiful that I haven't thought of yet.</p>
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    1. COVisual studio shouldn't be doing that, I think you might be doing it wrong.
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    2. COAre you using `/Za` (disable language extensions). If not, is using this switch an option? http://connect.microsoft.com/VisualStudio/feedback/details/379496/static-const-member-variable-defined-multiple-times
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    3. CO@Charles Bailey: I cannot use /Za. I just tried it, and all the Windows header files break horribly. I need those for things like the inline wrapped Windows/Pthread mutex functions so I cannot break *all* of the Windows code into OS specific .cpp files.
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