Re: ifneq inside a function

[Noel Yap]

I think you need to do:

$(eval $(call something))

Typically, I have two functions when I want to do something like this:

define implementation
  ifneq (,)
    $(warning weird)
  endif
endef

interface = $(eval $(call implementation))

$(call interface)

HTH,
Noel

Ken Smith wrote:

> I can't justify to myself why this makefile
>
> define something
>   ifneq (,)
>     $(warning weird)
>   endif
> endef
>
> $(call something)
>
> generates the following output
>
> testcase.mk:6: weird
> testcase.mk:6: *** missing separator.  Stop.
>
> What I'm trying to do is rudimentary checking of the parameters passed
> to a function.  I know that the function I am writing should take two
> parameters so I'm checking to see if $(3) is empty or nonempty.  If it
> is nonempty, I want to end processing with $(error).  What is the idiomatic
> way of doing this?