What is wrong with this make file?

[Hiebert, Darren (IS)]

Hello,

Can you please tell me what I misunderstand? For some reason, when I run make 
with the makefile below, the pattern rule is not properly created to depend 
upon the value of PREREQ. I have examined the output of "make -dpr" and see 
that the makefile tries to evaluate the literal text of "$PREREQ" instead of 
the value of the variable. When I replace the quadruple "$$$$" with a double 
"$$", then the evaluations that occur during the "call" and the "eval" evaluate 
the value or PREREQ at the time of expansion, but using the quadruple "$$$$" 
leaves in the actual text of "$PREREQ" instead of a reference to evaluate at 
run time.

Thank you,
Darren

-------------------------
define rule

%.o: %$(1) $$$$(PREREQ)
        touch $$@

endef

$(eval $(call rule,.c))

all: a.o

%.o: PREREQ = b.o
-------------------------

--
Darren Hiebert
(256) 327-6520