functions.mk: allow setting to an empty value

set() is a function of two variables but the and() check for *both* is incorrect as one might need to override a previously set variable with empty string; this has manifested itself with a case like this: @$(call set,ROOTPW_EMPTY,1) # ... @$(call set,ROOTPW_EMPTY,)

functions.mk: allow setting to an empty value
a3ddce7a · Michael Shigorin · 2fa72595 · a3ddce7a
Commit a3ddce7a authored Sep 18, 2014 by Michael Shigorin
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functions.mk lib/functions.mk +2 -1

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--- a/lib/functions.mk
+++ b/lib/functions.mk
@@ -22,7 +22,8 @@ endef
 # ...set() comments out any previous definition
 # and then appends an assigning rule...
-set = $(and $(1),$(2),$(set_body))
+# NB: $(2) could be empty
+set = $(and $(1),$(set_body))
 define set_body
 { $(log_body); \
 sed -i 's|^$(1)[ 	]*[+?]*=.*$$|#& # overridden by $@|' "$(CONFIG)"; \