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Re: How to specify a dependence on a directory?

From: Peng Yu
Subject: Re: How to specify a dependence on a directory?
Date: Sun, 10 Jan 2010 14:59:28 -0600

On Sun, Jan 10, 2010 at 11:02 AM, Paul Smith <address@hidden> wrote:
> On Sun, 2010-01-10 at 10:22 -0600, Peng Yu wrote:
>> The code that you suggested is not working properly, when make is
>> called the second time. Would you please take a look at how to fix it?
>> $ cat Makefile
>> TXT_FILES:=$(wildcard somedir/*.txt)
>> ifeq ($(TXT_FILES),)
>> .PHONY: all
>> endif
>> .PHONY: clean
>> all: $(TXT_FILES)
>>       ./
>> $make   # I do not expect should be called here, because
>> all *.txt is newer than
> ?!?!  What does whether the text files are newer than have to
> do with anything?

I don't understand how to adapt your following code segment. Would you
please be explicit on how to use your code in my problem?

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

> Your makefile shows that the target "all" depends on the text files, so
> the only thing make cares about is whether any of the text files are
> newer than "all".  Make doesn't know ANYTHING about
> If you don't want the command to be run when the text files haven't been
> changed then you to be sure the file "all" exists with a timestamp newer
> than the text files.  Or, change your rules.
> --
> -------------------------------------------------------------------------------
>  Paul D. Smith <address@hidden>          Find some GNU make tips at:
>  "Please remain calm...I may be mad, but I am a professional." --Mad Scientist
> _______________________________________________
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