add missing dependency

[openwrt/openwrt.git] / rules.mk

diff --git a/rules.mk b/rules.mk
index 5c66dfde1a14942f3b220608c3a899f3db9605ba..d36c99495310c2558f8c32b5ac5dbff65e53780a 100644 (file)
--- a/rules.mk
+++ b/rules.mk
@@ -138,6 +138,11 @@ $(call shvar,$(1))=$$(call $(1))
 export $(call shvar,$(1))
 endef
 
+empty:=
+space:= $(empty) $(empty)
+merge=$(subst $(space),,$(1))
+confvar=$(call merge,$(foreach v,$(1),$(if $($(v)),y,n)))
+
 # file extension
 ext=$(word $(words $(subst ., ,$(1))),$(subst ., ,$(1)))