CODEWITHSUNDEEP
shellunixmakefile
tyrondis
tyrondis

Reputation: 3494

How can I parameterize make targets?

I have the following targets in my makefile to generate icons for my Android app:

base_icon := icon-base.png

Icon-ldpi.png: $(base_icon)
    convert $< -resize 36x36 -unsharp 1x4 $@

Icon-mdpi.png: $(base_icon)
    convert $< -resize 48x48 -unsharp 1x4 $@

Icon-hdpi.png: $(base_icon)
    convert $< -resize 72x72 -unsharp 1x4 $@

Icon-xhdpi.png: $(base_icon)
    convert $< -resize 96x96 -unsharp 1x4 $@

Icon-xxhdpi.png: $(base_icon)
    convert $< -resize 144x144 -unsharp 1x4 $@

Icon-xxxhdpi.png: $(base_icon)
    convert $< -resize 192x192 -unsharp 1x4 $@

icons_android: \
    Icon-ldpi.png \
    Icon-mdpi.png \
    Icon-hdpi.png \
    Icon-xhdpi.png \
    Icon-xxhdpi.png \
    Icon-xxxhdpi.png

How can I make this more elegant without repeating the convert instructions over and over again?

What I was looking for was having some sort of a parameterized target:

Icon-%.png: $(base_icon)
    convert $< -resize $(size) -unsharp 1x4 $@

But I am not certain how to lookup the $(size) for the given icon. Is there some sorts of a map that I can define in a Makefile and lookup in the target?

Upvotes: 0

Views: 430

Answers (1)

Eric
Eric

Reputation: 471

Try following example, although it's not perfect,

base_icon :=  icon-base.png

define icon_template
Icon-$(1).png: $$(base_icon)
        convert $$< -resize $(2) -unsharp 1x4 $$@
icons_android: Icon-$(1).png
endef

$(eval $(call icon_template,ldpi,36x36))
$(eval $(call icon_template,mdpi,48x48))
$(eval $(call icon_template,hdpi,72x72))

Upvotes: 1

Related Questions