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

[Reinier Post]

URL:
  <http://savannah.gnu.org/bugs/?30606>

                 Summary: mysterious behavior from $(if)
                 Project: make
            Submitted by: r_p
            Submitted on: Fri 30 Jul 2010 07:07:46 PM GMT
                Severity: 3 - Normal
              Item Group: Bug
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
       Component Version: 3.81
        Operating System: None
           Fixed Release: None
           Triage Status: None

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Details:

With the following Makefile (simplified from my actual Makefile):


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

tests := ab ab ab ab ab ab ab

$(foreach t,$(tests), \
  $(eval $(call T,$(t))) \
)

all:; @echo $(vs)


I get the following output:

+verbatim
ab: ab:n ab:y ab:y ab:y ab:y ab:y


What on earth is going on here?  How can I fix it?
(I put the $(strip) in to be sure it wasn't related to
https://savannah.gnu.org/bugs/?5798
.)





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