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[bug #30606] mysterious behavior from $(if)


From: Paul D. Smith
Subject: [bug #30606] mysterious behavior from $(if)
Date: Fri, 30 Jul 2010 20:46:50 +0000
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.8) Gecko/20100723 Ubuntu/10.04 (lucid) Firefox/3.6.8

Follow-up Comment #5, bug #30606 (project make):

If by "already expanded ... when the template is being defined" you mean
after the define T ... endef, then you're not correct.  define, by itself,
uses deferred expansion (just like "T = $(foo)") and so right after the define
the value of T has NOT been expanded.

You can see this yourself using the $(info ...) function; very handy for
debugging expansion issues:


define T
b := $(subst aa,,$(1))
yn := $(if $(strip $(b)),y,n)
vs := $(vs) $(1):$(yn)
endef
$(info $(value T))

will show you the value of the T variable without expanding it first... this
is the text string that make is keeping for the variable T.

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