__FILE__

[Noel Yap]

I know this has been discussed before.  For those not familiar with it, 
__FILE__ as an implicit file-local variable has been proposed to allow modular 
recursive inclusion of makefiles.

Although I think this would be a great addition, I don't want to fight this 
battle :-)

Rather, I was wondering if the following would be a decent substitute.

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

include-makefile = $(eval $(call _include-makefile,$(1)))

Then one can do:
# GNUmakefile
$(call include-makefile,make/GNUmine.mk)

# make/GNUmine.mk
$(call include-makefile,$(dir __FILE__)/GNUanother.mk)

Does anyone see any problems with the above?  Is '/' a valid character in a 
macro name?

Thanks,
Noel
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