On 19 Nov 2003, Jeremy Broughton wrote:
> I have the following sample makefile, which seems to produce the following
> erroneous output, using the cygwin version 1.3.10:
>
> makefile:
>
> target1.txt : dependency1.exists
>
> target1.txt target2.txt :
> ifneq "" "$^"
> @echo $^
> else
> @echo this doesn't seem empty to me: $^
> endif
Just another user speaking here --
I think you're misinterpeting the ifneq syntax. Those are makefile lines that
are read on startup. But automatic variables like $^, $?, $@, $*, etc. are
target-specific variables that are expanded when the target rule is executed.
For what you want, you want to use a make function that is run at evaluation
time, like this:
target1.txt target2.txt :
@$(if $^,\
echo "Dollar-carat = $^",\
echo "this doesn't seem empty to me: $^")
Apologies if I get the syntax wrong, but I think you get the idea.
--
Ted Stern Applications Group
Cray Inc. office: 206-701-2182
411 First Avenue South, Suite 600 cell: 206-383-1049
Seattle, WA 98104-2860 FAX: 206-701-2500
Frango ut patefaciam -- I break that I may reveal
(The Paleontological Society motto, equally apropos for debugging)
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