[colug-432] Makefile Help

[Rick Troth]

Remember that each step in the recipe is executed independently. Shell
state is not preserved from step to step.

You could inline the test (so it becomes part of a longer command. You
could store the result of the test (or opts formed from it) in an
intermediate file. Lots if ways to skin this cat.
On Jul 28, 2013 9:04 PM, "Joshua Kramer" <joskra42.list at gmail.com> wrote:

> Hello Colug,
>
> Does anyone know how to test for a file's presence and set a Make variable
> accordingly?
>
> I have an apache module that needs one of two structure elements,
> depending on whether it's 2.2 or 2.4.  I have the following function in my
> makefile:
>
> # Test for presence of /etc/redhat-release:
> which-version:  $(DEFS)
>         export DEFS=-DDEF_REMOTE_IP=client_ip;
>         if test -f /etc/redhat-release; then \
>          echo RedhatRelease is present. ; \
>          export DEFS=-DDEF_REMOTE_IP=remote_ip; \
>         fi;
>         echo DEFS is "$(DEFS)"
>
> $(DEFS) is never getting set.  What am I doing wrong?
>
> Thanks!
> -JK
>
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