The makefile is parsed and expressions outside of the targets rules are expanded, then when a target is chosen to be built, it's rule is expanded.
You're creating a shell variable hello but trying to use a make variable $hello before this shell variable has been assigned. you end up with all: <tab>hello=1 #this will create a bash variable hello in the scope of this single line of shell code - no effect on the next line <tab> # nothing here because before this all got executed the before ifeq was expanded. So if I change it, I can make it "work" define check_defined $(1)=1 endef $(eval $(call check_defined,hello)) all: ifeq ($(hello),1) <tab>sleep 10 endif Cheers, Tim define check_defined > @$(1)=1; > endefall: > $(call check_defined, hello) > ifeq ($(hello),1) > sleep 10 > endif > > I am expecting, when I invoke "make all" it should sleep for 10 secs but it > is not happening, what is wrong with it and how can I achieve it? > > Thanks, > -Rajeev >
