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Re: a small question about subst

From: Ken Smith
Subject: Re: a small question about subst
Date: Thu, 12 May 2005 16:18:38 -0400
User-agent: Mutt/1.5.9i

Without seeing your code, I can only assume that you are trying to do
this in the command section of a rule.  If that is the case, you'll need
to use sed or something similar.  The GNU make functions will be
processed when the files are read and not when the targets are run.  At
that time, $< has no value and your statements evaluate to the empty

Here is a simple example


file1.out: $(my_root)/folder1/file1
        @echo "modified prerequisite=\"`echo $< | sed -e 's/folder1\///'`\""

        mkdir -p $(@D)
        touch $(@)


On Thu, May 12, 2005 at 02:09:48AM -0700, address@hidden wrote:
> Hi,
> I have a small question about subst in makefile
> script,
> when $< is /root/folder1/file1
> I want to change it to /root/file1
> I try
> $(subst folder1/,,$<)
> $(subst folder1\/,,$<)
> and fail
> Thanks for advise
> gan 
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