Fix build failure due to "multiple definition" errors #27
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The USB descriptor variables were effectively being declared twice--once in
usb_descriptors.c
and once inusb_core.c
--because both files includedusb_descriptors.h
, where those variables were originally declared without the "extern" keyword. Because of this, GCC refused to link the object files. After declaring the variables as "extern", the build finishes without issue.Here's an example of the issue this PR fixes: