%% "Robert P. J. Day" <[EMAIL PROTECTED]> writes:
rpjd> ${SUBDIRS}:
rpjd> @echo "My target is [EMAIL PROTECTED]"
rpjd> @echo "My makefile variable contains [EMAIL PROTECTED]"
rpjd> ifneq "[EMAIL PROTECTED]" ""
rpjd> @echo "Yup, that variable is set."
rpjd> endif
This cannot work.
Make preprocessor statements are evaluated when the makefile is read in,
just like the C/C++ preprocessor.
The contents of rules, and in particular automatic variables like $@,
are only set when the rule is invoked.
You have to use SHELL syntax to test whether something is set in the
shell, not make syntax.
rpjd> i want to call this with something like:
rpjd> $ make d2_MAKEFILE=d2make d2
rpjd> and be able to test whether the corresponding variable is set within
rpjd> the rule.
Try something like:
${SUBDIRS}:
@echo "My target is [EMAIL PROTECTED]"
@echo "My makefile variable contains [EMAIL PROTECTED]"
@[ -n "[EMAIL PROTECTED]" ] && echo "Yup, that variable is set."
--
-------------------------------------------------------------------------------
Paul D. Smith <[EMAIL PROTECTED]> Find some GNU make tips at:
http://www.gnu.org http://make.paulandlesley.org
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
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