__FILE__

[Noel Yap]

I just wanted to share the following.  I created two functions:

define _include-makefile
  __FILE__ := $(1)
  include $(1)
  __FILE__ := $(2)
endef

# include makefile passing in its name as __FILE__
include-makefile = $(eval $(call _include-makefile,$(1),$(__FILE__)))

That can be used by doing something like:

$(call include-makefile,another/makefile)

such that another/makefile will know it's path relative to the includer so it, 
in turn, can do something like:

$(call include-makefile,$(dir $(__FILE__))/yet-another-makefile)

I think I had posted something similar a while back, but this version uses 
function-local variables to save and restore the previous __FILE__ value.

HTH,
Noel
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