Re: %-style pattern rules

[Benoit SIGOURE]

On Jul 26, 2007, at 2:42 PM, BeN [F1233 121D312] wrote:
> Lorenzo Bettini wrote:
> > about rules of the shape, e.g.,
> >
> > %.txt: %.tt
> >
> > how else could I implement those make rules?
>
> I guess so called old-fashioned style of implicit rules would do:
>
> e.g:
>
> .SUFFIXES: .txt .tt
>
> all: t.txt
>
> .tt.txt:
>     cp -v $< $@

The .SUFFIXES part is not necessary, first off because you should use  
SUFFIXES = .txt .tt (actually automake will throw a warning or an  
error if you do this, can't remember) automake will recognize it and  
do what-needs-to-be-done so that the generated Makefile is portable.   
There are some issues with .SUFFIXES but can't remember what though.

http://www.gnu.org/software/automake/manual/html_node/Suffixes.html
"As you may have noted, the SUFFIXES variable behaves like  
the .SUFFIXES special target
of make. You should not touch .SUFFIXES yourself, but use SUFFIXES  
instead and let
Automake generate the suffix list for .SUFFIXES. Any given SUFFIXES  
go at the start of
the generated suffixes list, followed by Automake generated suffixes  
not already in the list."

But in the end, you don't even need to do any of this because  
automake is clever enough to figure out that .txt and .tt must be  
added in .SUFFIXES when it encounters the `.tt.txt:' rule.

Cheers,

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--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory