Re: a small question about subst

[Ken Smith]

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
string.

Here is a simple example

my_root=root

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

root/folder1/file1:
        mkdir -p $(@D)
        touch $(@)

  Ken

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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