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If you try to build local SBSMS with CMake for i686, you get many error messages like this one: audacity/lib-src/sbsms/src/fft.h:346:29: warning: SSE vector return without SSE enabled changes the ABI [-Wpsabi] The solution is to add the option provided by SSE_FLAGS. So, I replicated in this PR the same fix made for local soundtouch and LAME library.
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.