On 6/29/07, Stephan Beal <[EMAIL PROTECTED]> wrote:
...
i've got it working, but of course it's missing the short-circuit
features of built-ins, e.g. so that the $(error) in:
$(if X,,$(error this is an error))
will only be evaluated if !X. That works for built-ins of course, but i
don't see a way to do it with add-on funcs.
It can't be done. To quote the info pages:
The `call' function expands the PARAM arguments before assigning
them to temporary variables.
The closest alternative I can think of is to instead pass the names of
variables to be evaluated for the 'then' and 'else' clauses:
mythen = $(warning this should happen)
myelse = $(warning this should not happen)
$(call if-eq-vars,abc,abc,mythen,myelse)
That's not hard to implement:
if-eq-vars = $(eval ${if-eq-vars-impl})
define if-eq-vars-impl
ifeq ($1,$2)
$(value $3)
else
$(value $4)
endif
endef
...but it's clunky to use, eliminating most the point of the function.
Philip Guenther
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