if i want to do a simple check for a non-empty string, i know i can
use (as the simplest variation):
ifneq "${VAR}" ""
but i have the following simplified makefile:
SUBDIRS = d1 d2 d3
.PHONY: ${SUBDIRS}
${SUBDIRS}:
@echo "My target is [EMAIL PROTECTED]"
@echo "My makefile variable contains [EMAIL PROTECTED]"
ifneq "[EMAIL PROTECTED]" ""
@echo "Yup, that variable is set."
endif
i want to call this with something like:
$ make d2_MAKEFILE=d2make d2
and be able to test whether the corresponding variable is set within
the rule.
what i get is:
-------
$ make d2_MAKEFILE=d2make d2
My target is d2.
My makefile variable contains d2make
-------
so the "ifneq" doesn't give me the result i expect, and i assume
it's because of how "ifneq" does variable evaluation. what's the
proper syntax for that kind of check? thanks.
rday
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