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e83c66ee50
... When the graph of library dependencies is not recursive but complicated, a combinatorial explosion of paths could make the post-build step not infinite but very long (80 minutes in one of my experimental refactoring branches!)
CMake requires that its CMakeList.txt files follow the directory structure of the projects. However, for Audacity this would cause collision with existing CMakeList.txt files that e.g. expat and libsoxr already provide. Our solution is to have this proxy directory for lib-src to hold our version of the CMakeList.txt files. We did try bundling several libraries under one CMakeList.txt without using subdirectories. However, we were then fighting CMake too much - and did not have a clean separation of information between sub projects.