Re: VPATH/vpath and Pattern Rules

[Paul Smith]

On Sat, 2012-01-14 at 13:46 +0100, Michael Ludwig wrote:
> How can you convince Make to honour the VPATH/vpath when using a Pattern
> Rule defined in my Makefile (as opposed to the built-in pattern rule)?

It does already: no need for convincing.

> # Pattern Rule
> %.o: %.cpp
>       $(COMPILE.cc) $*.cpp -o $*.o

This is not right.  The $* variable matches the stem of the pattern.
The stem of the pattern here is something like "Employee", the stem is
NOT "emp/Employee".  You can see this easily be changing your rule to
print out the values of the various automatic variables.

If you want this to work you need to use the $@ and $< variables, like
so:

        %.o: %.cpp
                $(COMPILE.cc) $< -o $@

Hope this helps...

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