Re: "No targets" message with pattern rule

[John Graham-Cumming]

August Karlstrom wrote:
> OK I see. So what should I add to the makefile to tell make to create a 
> .suffix2 file for each .suffix1 file? I have tried the following but it 
> doesn't seem to work:
>
> .PHONY: main
> main: $(wildcard *.suffix2)
>
> %.suffix2: %.suffix1
>     cp $< $@

That's because $(wildcard *.suffix2) ends up being an empty list and 
hence the Makefile is equivalent to:

    .PHONY: main
    main:

    %.suffix2: %.suffix1
        cp $< $@

(i.e. because there are currently no .suffix2 files there are no prereqs 
to main).  You can solve this in a couple of ways.  The simplest is to 
take the output of the $(wildcard) and change the suffix on every file:

    .PHONY: main
    main: $(subst .suffix2,.suffix1,$(wilcard *.suffix2))

    %.suffix2: %.suffix1
        cp $< $@

John.
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