Re: Problems with eval

[Paul D. Smith]

%% Greg Kilfoyle <address@hidden> writes:

  gk> I rule that can be gleaned from this (that my colleague suggested)
  gk> for using eval with define is that any '$' which is not a function
  gk> argument (such as $(1)) must be preceded by an extra '$'. The
  gk> above code certainly demonstrates this.

This is not a rule for eval per se, it's a rule for using call with
eval.

If you eval'd a variable directly and didn't use call you wouldn't have
to do this escaping.


The problem is that the $(call ...) function will evaluate your function
contents _FIRST_, then pass the results of that evaluation to the $(eval
...) function.  So, any variables that you don't want evaluated in the
context of the $(call ...) but instead want evaluated in the context of
the $(eval ...), need to be escaped (once) to hide them from the $(call
...).

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