CODEWITHSUNDEEP
makefilegnu-make
Yaroslav Fyodorov
Yaroslav Fyodorov

Reputation: 739

make: more than one % in dependency

I would love to use template dependency of the following form

data/%/ld.data :: data/%/%LD.jsn

Now, only the first percent sign in dependency data/%/%LD.jsn is replaced by the directory from the target, as specified in the GNUmake manual

Is there any simple way to get the desired functionality, that is to specify that all files of the form data/Folder/ld.data depend on the corresponding file data/Folder/FolderLD.data.

I can build rules with loop but this requires specifying all the relevant folders in advance and editing makefile when new folder is added (or finding them dynamically at makefile start)

Upvotes: 1

Views: 96

Answers (2)

MadScientist
MadScientist

Reputation: 100956

Yes, there is a much simpler way; use automatic variables during second expansion (this is really what second expansion was originally created to allow):

.SECONDEXPANSION:
data/%/ld.data : data/$$*/$$*LD.jsn
        actions

Upvotes: 4

Yaroslav Fyodorov
Yaroslav Fyodorov

Reputation: 739

One solution I have adapted from http://bitofahack.com/post/1406231094 goes like this

.SECONDEXPANSION:
data/%/ld.data: LANGNAME=$(notdir $(patsubst %/,%,$(dir $@)))
data/%/ld.data: LDFILE=data/$(LANGNAME)/$(LANGNAME)LD.jsn

data/%/ld.data: $$(LDFILE)
   actions

But this looks cumbersome, to say nothing about the crazy way $(notdir ...) and $(dir ...) cannot work together

Upvotes: 0

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