Hard-to-build python extensions are basically .so files with some special symbols exposed. As others said, a general task to "build libfoo.so" is very complex,

Hard-to-build python extensions are basically .so files with some special symbols exposed. As others said, a general task to "build libfoo.so" is very complex, and currently requires a wide variety of build systems. I don't see why this will get any easier if we require this .so file to export some Python-specific symbols.