[NMLUG] Loop/wildcard-like syntax for GNU make?

[niosop at gmail.com (Matthew Bowie)]

Not sure if you're trying to convert a whole directory, or want to be able
to convert a specific file w/o having to specify the file.  If it's the
second case, then this should work:

%.jpg: %.gif
        convert $*.gif $*.jpg

If it's the first case, let me know and I'll see what I can come up with.

Matt



On 4/17/07, Kelly Jones < kelly.terry.jones at gmail.com> wrote:
>
> Here's a Makefile that converts 3 GIFs to JPGs in a given directory:
>
> 1.jpg: 1.gif
>        /usr/local/bin/convert 1.gif 1.jpg
> 2.jpg: 2.gif
>        /usr/local/bin/convert 2.gif 2.jpg
> 3.jpg: 3.gif
>        /usr/local/bin/convert 3.gif 3.jpg
>
> How do I generalize this to apply to ALL the GIFs in a given
> directory? I tried:
>
> *.jpg: *.gif
>        /usr/bin/local/bin/convert $1.gif $1.jpg
>
> but this obviously doesn't work (I didn't really expect it to). Neither
> does
>
> for $i (*.jpg) {
> $i.jpg: $i.gif
>         /usr/bin/local/bin/convert $i.gif $i.jpg
> }
>
> (again, didn't really expect it to, since you can't put shell looping
> into a Makefile).
>
> --
> We're just a Bunch Of Regular Guys, a collective group that's trying
> to understand and assimilate technology. We feel that resistance to
> new ideas and technology is unwise and ultimately futile.
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-- 
Matthew Bowie
Programmer/IT Consultant
niosop at gmail.com
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