Here is a list of all macros with links to the files they belong to:

CCIEXPORT : CCI.h
CTRE_ASSERT : Platform-pack.h
CTRE_IMPLEMENT_SHUTDOWN_HANDLER : Platform-pack.h
CTRE_REGISTER_SHUTDOWN_HANDLER : Platform-pack.h
PACK_ATTRIB : Platform-pack.h
PACK_PREFIX : Platform-pack.h
PACK_SUFFIX : Platform-pack.h
Phoenix_WPI : Phoenix.h