The "SPC560Bxx OSAL Component RLA" 1.0.201704140929 doesn't work with C++ since the extern "C"-block isn't closed in osal.h and systimer.h
many thanks for the feedback. We'll fix this issue for next SPC5studio release.
meanwhile (but I think you have already did it) adding the following lines at the end of function declaration
in systimer,h and osal.h will let you compile without errors:
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