I'm including a file at the beginning of my Makefile that will just have
lines like:
SOMETHING=123
SOMETHING_ELSE=hello
In the Makefile, I then have this:
ifndef SOMETHING
missing += SOMETHING
endif
Then ${missing} has all the missing variables which can be echoed to the
user. But then I need to have this ifndef... section for every variable and
it's difficult to maintain and read. I've tried a number of things,
including the following:
required = SOMETHING SOMETHING_ELSE
define CHECKIT
ifeq ($$($(strip $(1))),)
echo $(1)
endif
endef
missing = $(foreach var,$(required),$(call CHECKIT,$(var)))
I'm using GNU make 3.81, but I'll need something that's fairly portable. Any
ideas? Thanks in advance...
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