Hi, I have amended an example of how to use $(and) that I posted earlier for Rakesh. I have tested this on Linux with make 3.81.
It shows a crude way and a slightly more sophisticated way to use $(and) in an if statement to determine if two variables have equal values: A=2 > B=4 > > # do "equal" by seeing if a subst returns the empty string: > A_is_2:=$(if $(subst 2,,$(A)),,T) > B_is_4:=$(if $(subst 4,,$(B)),,T) > > AandB:=$(and $(A_is_2),$(B_is_4)) > > # then you could do something based on this: > $(info Crude AND Demo: ) > ifneq ($(AandB),) > $(info TRUE: A is 2, B is 4) > else > $(info FALSE: A is $(A), B is $(B)) > endif > > > # One could make it look nicer by making an equals macro: > define eq > $(if $(1:$(2)=),,$(if $(2:$(1)=),,T)) > endef > > # which you could use as follows: > > $(info Macro-based AND Demo: ) > ifneq ($(and $(call eq,$(A),2),$(call eq,$(B),4)),) > $(info TRUE: A is 2, B is 4) > # do what you want to do when A=2 and B=4 > else > $(info FALSE: A is $(A), B is $(B)) > endif > The output looks like this: [EMAIL PROTECTED] base]make -f and.mk A=1 B=5 > Crude AND Demo: > FALSE: A is 1, B is 5 > Macro-based AND Demo: > FALSE: A is 1, B is 5 > make: *** No targets. Stop. > > [EMAIL PROTECTED] base]make -f and.mk A=2 B=4 > Crude AND Demo: > TRUE: A is 2, B is 4 > Macro-based AND Demo: > TRUE: A is 2, B is 4 > make: *** No targets. Stop. > > [EMAIL PROTECTED] base]make -f and.mk A=2 B=3 > Crude AND Demo: > FALSE: A is 2, B is 3 > Macro-based AND Demo: > FALSE: A is 2, B is 3 > make: *** No targets. Stop. > 2008/6/6 Paul Smith <[EMAIL PROTECTED]>: > On Fri, 2008-06-06 at 05:05 -0700, rakesh aggarwal wrote: > > But still there is some problem. > > I haven't looked at your example. > > But, the very first thing to check is the version of GNU make you're > using (make --version). If it's not 3.81, then the manual you're > reading is not the right one for the version of GNU make you're using. > > -- > > ------------------------------------------------------------------------------- > Paul D. Smith <[EMAIL PROTECTED]> Find some GNU make tips at: > http://www.gnu.org http://make.mad-scientist.us > "Please remain calm...I may be mad, but I am a professional." --Mad > Scientist > -- You could help some brave and decent people to have access to uncensored news by making a donation at: http://www.thezimbabwean.co.uk/
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