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Hi, I ran into the bug/feature request that you cannot flush gcov buffers while the app is running. They are only called when you exit the program, since the flush functions are registered with atexit(). This is the bug report: http://llvm.org/bugs/show_bug.cgi?id=12144 I have what I think is a basic implementation of the `__gcov_flush` call, although I called this version `__llvm_gcov_flush`.