CODEWITHSUNDEEP
makefilegnu-make
Elias
Elias

Reputation: 234

GNU make nested generic rules

I use make to automate numerical experiments. It is often the case that I have to simulate data that depends on multiple parameters.

For example, I may have the size of the reconstructed image as a parameter, the noise level as another and also the reconstruction algorithm as a third parameter.

As a concrete case, I may wish to reconstruct 512x512 and 1024x1024 images from 10% and 5% relative error in the data, all the four cases should be done with both FISTA and ISTA algorithms.

I know how to use patterns with %, $@ and $* in order to get what I want when there is only one parameter involved. So, it is easy to get the result for 1024x1024 images using FISTA for several error levels.

But how do I nest?

Upvotes: 0

Views: 532

Answers (1)

Renaud Pacalet
Renaud Pacalet

Reputation: 29345

If what you want (not 100% sure) is to loop over all possible cases, and if the command to launch for each case is:

echo simulate SIZE RELATIVE_ERROR ALGORITHM

then you could try something like:

# sizes
S := 512 1024
# relative errors
E := 5 10
# algorithms
A := FISTA ISTA
# targets
T :=

.PHONY: all
.DEFAULT_GOAL := all

# $(1): size, $(2): error, $(3): algo
define MY_rule
T += $(1)-$(2)-$(3)
.PHONY: $(1)-$(2)-$(3)

$(1)-$(2)-$(3):
    @echo simulate $(1) $(2) $(3)
endef

$(foreach s,$(S),$(foreach e,$(E),$(foreach a,$(A),$(eval $(call MY_rule,$(s),$(e),$(a))))))

all: $(T)

It makes use of an advanced GNU make feature, the foreach-eval-call combination. This other answer explains it in details.

Upvotes: 1

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