https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64953
--- Comment #1 from manuel.reimer at gmx dot de --- One addition: The same problem exists with other "USB based" sourcecode. For example with this one: https://github.com/j1rie/IRMP_STM32/ olebowle at vdr-portal.de did a nice overview on which optimization settings cause the resulting software to fail on which compiler: http://www.vdr-portal.de/board18-vdr-hardware/board13-fernbedienungen/p1231315-irmp-auf-stm32-ein-usb-ir-empf%C3%A4nger-sender-einschalter-mit-wakeup-timer/#post1231315
