Re: How to specify a dependence on a directory?

[Paul Smith]

On Fri, 2009-11-20 at 18:50 -0600, Peng Yu wrote:
> But I don't want to explicitly specify the files, because I might
> change 'some_command' to generate different files.  I don't want to
> modify Makefile every time I change 'some_command'. 

So, to be clear: you want the rule to run if there are no files in the
directory, or if there are any files and any of them are newer than the
target?

How about:

        FILES := $(wildcard somedir/*)
        ifeq ($(FILES),)
        .PHONY: target
        endif
        target: $(FILES)
                somecommand

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