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POCMake add_subdirectory and recompiling
 

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    <p>I've just migrated a somewhat large project from Visual Studio solutions to CMake and I've noticed a weird behavior. I have something like the following structure:</p> <pre><code>project/CMakeLists.txt project/code/CMakeLists.txt project/code/library-1/CMakeLists.txt project/code/library-1/*.hpp project/code/library-1/*.cpp project/code/library-2/CMakeLists.txt project/code/library-2/*.hpp project/code/library-2/*.cpp ... project/code/library-n/CMakeLists.txt project/code/library-n/*.hpp project/code/library-n/*.cpp project/demo/CMakeLists.txt project/demo/demo-1/CMakeLists.txt project/demo/demo-1/*.hpp project/demo/demo-1/*.cpp project/demo/demo-2/CMakeLists.txt project/demo/demo-2/*.hpp project/demo/demo-2/*.cpp ... project/demo/demo-n/CMakeLists.txt project/demo/demo-n/*.hpp project/demo/demo-n/*.cpp </code></pre> <ol> <li>The root <code>CMakeLists.txt</code> file configures the compilation flags, macro definitions, etc. and uses CMake's <code>add_subdirectory()</code> to include targets defined by the libraries and demo projects.</li> <li>The <code>code</code> sub-folder contains a flat list of sub-folders with each containing source code for a static library (as well as its target defined in a <code>CMakeLists.txt</code> file).</li> <li>The <code>demo</code> sub-folder contains a flat list of sub-folders. Each contains source code for an executable and associated <code>CMakeLists.txt</code> file.</li> <li>Each library is a standalone component and builds independently from all other libraries and demo projects.</li> <li>Each demo program depends on one or more of the different libraries in the <code>code</code> sub-folder.</li> </ol> <p>This setup is really nice. If I want to change build options, I only need to modify the root <code>CMakeLists.txt</code> and everything re-compiles with the new settings. If I modify any source code anywhere in the tree, the appropriate libraries, if any, are recompiled and all dependent demo programs are also re-built.</p> <p>However, if I modify <em>any</em> <code>CMakeLists.txt</code> file anywhere in the tree, the entire tree of libraries and programs is re-compiled without respect of dependencies. To give an idea of what I mean, here a few parts of the CMake build scripts.</p> <hr> <p><strong><code>project/demo/CMakeLists.txt</code></strong></p> <pre><code># Resolve libraries built in `code` sub-folder. link_directories(${LIBRARY_OUTPUT_PATH}) set(demo-projects demo-1 demo-2 ... demo-n ) foreach(demo-project ${demo-projects}) add_subdirectory(${demo-project}) endforeach() </code></pre> <hr> <p><strong><code>project/demo/demo-n/CMakeLists.txt</code></strong></p> <pre><code># Find all source code in the same folder. file(GLOB ${demo-project}_headers ${CMAKE_CURRENT_SOURCE_DIR}/*.hpp ) file(GLOB ${demo-project}_sources ${CMAKE_CURRENT_SOURCE_DIR}/*.cpp ) # Select libraries to link with. set(${demo-project}_libraries library-1 library-2 library-5 ) # Build the demo program. add_executable(${demo-project} ${${demo-project}_headers} ${${demo-project}_sources} ) if(${demo-project}_libraries) target_link_libraries(${demo-project} ${${demo-project}_libraries}) endif() # Manually register some dependencies on other targets. if(${demo-project}_dependencies) add_dependencies(${demo-project} ${${demo-project}_dependencies}) endif() </code></pre> <hr> <p>If I happen to modify <code>project/demo/demo-n/CMakeLists.txt</code> to add an extra library, like this:</p> <pre><code>set(${demo-project}_libraries library-1 library-2 library-5 library-6 ) </code></pre> <p>Then the <em>entire</em> source code for all libraries and demo programs in the project is re-compiled. Why is this so? Is there a better way to structure my scripts in order to avoid this?</p>
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    1. COI'm surprised nobody has encountered this issue before. It seems very painful for any medium sized project and must be horrible for larger projects.
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