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Leif Asbrink leif at sm5bsz.comHi, Attempts to link librtlsdr and libusb-1.0 with my project Linrad gives these warning messages: Warning: .drectve `-aligncomm:"__poll_fd",5 ' unrecognized Warning: .drectve `-aligncomm:"_poll_fd",5' unrecognized Warning: .drectve `-aligncomm:"_htab_filled",2 ' unrecognized Warning: .drectve `-aligncomm:"_htab_size",2 ' unrecognized Warning: .drectve `-aligncomm:"_timer_tp",2 ' unrecognized Warning: .drectve `-aligncomm:"_autoclaim_lock",2 ' unrecognized Warning: .drectve `-aligncomm:"_hires_ticks_to_ps",3 ' unrecognized Warning: .drectve `-aligncomm:"_hires_frequency",3' unrecognized I get an executable and it runs OK until to rtlsdr_read_async(....) is called from a separate thread. Once async read is running the calls to libusb no longer work OK. Windows crashes on call to libusb_control_transfer. By issuing a wait in the thread that calls rtlsdr_read_async I can assure that no calls will be made to libusb_control_transfer after async is started. The call to libusb_handle_events_timeout returns -1 which is LIBUSB_ERROR_IO about 3 times more often than it returns zero. By ignoring this error I have a running system, it receives the antenna signal fine from the dongle. BUT if I try to change frequency or gain Windows crashes. Also if I try to exit. It seems one must not call anything else in libusb-1.0 after having started read. I have used mingw32, the standard install under Ubuntu. I was unable to use the configure script but made a simple script to compile with /usr/bin/i586-mingw32msvc-gcc and then create the library and install like this: /usr/bin/i586-mingw32msvc-ar rc librtlsdr.a librtlsdr.o tuner_tuner_fc0013.o tuner_fc2580.o tuner_r820t.o /usr/bin/i586-mingw32msvc-ranlib librtlsdr.a cp librtlsdr.a /usr/i586-mingw32msvc/lib The libusb-1.0.a file is from the MinGW32 directory in libusbx-1.0.14-win.7z What can I do to fix the problem? Regards Leif