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stdarg.h and especially stddef.h are textual and so everything they declare gets precompiled into all of their clients' pcm files. They shouldn't directly declare anything though, their purpose is to select what submodules get imported, and not to add duplicate declarations to all of their clients. Make it so that they always ignore their header guards, even without modules, and declare them in separate header files so that they only go into the stdarg/stddef pcms. Still declare them in case clients rely on them.