What's the meaning of >&8?

For Developers
1 
define ERROR_MESSAGE
  printf "$(_R)%s$(_N)\n" "$(1)" >&8
endef

ifeq ($(findstring s,$(OPENWRT_VERBOSE)),)
  define MESSAGE
	printf "$(_Y)%s$(_N)\n" "$(1)" >&8
  endef
2

The output of printf is sent to file descriptor number 8. Likely to bypass existing >/dev/null, 2>/dev/null redirections.

A wrapping command will then redirect descriptor 8 back to stdout (1) or stderr (2).

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