image.in: add include-once check

This is following mkimage's approach; better late than never.

image.in: add include-once check
f1cc7f0c · Michael Shigorin · Anton Midyukov · 9e2e5c0c · f1cc7f0c
Commit f1cc7f0c authored Jul 18, 2019 by Michael Shigorin Committed by Anton Midyukov Sep 26, 2020
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functions.mk image.in/functions.mk +4 -0

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--- a/image.in/functions.mk
+++ b/image.in/functions.mk
 ifneq (clean,$(MAKECMDGOALS))
 ifneq (distclean,$(MAKECMDGOALS))

+ifndef INCLUDED_FUNCTIONS_MK
+INCLUDED_FUNCTIONS_MK = 1
+
 # globals
 PKGDIR ?= $(GLOBAL_BUILDDIR)/pkg

@@ -49,3 +52,4 @@ branding = $(and $(1),^branding-$(BRANDING)-($(call list2re,$(1)))$$)

 endif
 endif
+endif