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    <p>I'm not familiar with the way CMake generates Visual Studio solution/project files, but I'm guessing it's generating one (set?) for your entire project. Due to the nature of the way CMake works (I can't find good documentation on this; maybe the "Mastering CMake" book?), if the subdirectory project files are not separate, it will regenerate them any time a CMakeLists.txt file is changed. Then, Visual Studio would be responsible for rebuilding the whole thing or not (I'm guessing that it rebuilds it when it sees that the project file has changed).</p> <p>The <a href="http://www.cmake.org/cmake/help/cmake-2-8-docs.html#command%3aadd_subdirectory" rel="nofollow">documentation for add_subdirectory</a> does say</p> <blockquote> <p>The CMakeLists.txt file in the specified source directory will be processed immediately by CMake before processing in the current input file continues beyond this command.</p> </blockquote> <p>That seems to indicate that all the subdirectories are processed as part of the main project.</p> <p>That same documentation mentions the use of the <code>project</code> command in a subdirectory. It's talking about when you use the <code>EXCLUDE_FROM_ALL</code> argument, but it seems possible (worth a try) that it could help in your situation anyway. For example, maybe if CMake generates the demo code as its own project, the main code won't get rebuilt when the demo project file changes.</p> <p>I think that, to get a definitive answer, you may need to post on the <a href="http://www.cmake.org/cmake/help/mailing.html" rel="nofollow">CMake mailing list</a> (and if you get a good answer, post it here).</p>
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    1. POCMake add_subdirectory and recompiling
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    1. USSam Hartsfield
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    1. COI'm not using Visual Studio anymore, I use NMake and [JOM](http://labs.qt.nokia.com/2009/03/27/speeding-up-visual-c-qt-builds/) to compile. I haven't tested for the same behavior with Visual Studio project files.
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      1. USAndré Caron
    2. COHmmm, it seems your quote from the documentation might explain the behavior. If the `CMakeLists.txt` are processed "immediately", it would indeed give the impression that CMake needs to regenerate the entire set of build scripts, resulting in build scripts that are newer than their targets, which then causes a re-build.
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      1. USAndré Caron
 

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