On Miércoles 08 Septiembre 2010 12:06:33 Gerald Lutter escribió: > Hello List, > > I'm using make (3.81) from cygwin and I encountered the following "problem" > with a rule that looks like this: > > $(targetlist): $(sourcelist) > do something that generates $(targetlist) from $(sourcelist) > > Now in my case the receipe is executed several times (number of entries > inside the target list). I think this depends on the evaluation of multiple > target rules described inside the gnu make manual. But the receipe builds > all three files together and therefore the command does not have to be > executed more than one time. > > My question is now, is there a possibility to change this behaviour or do I > have to reduce the number of targets to prevent this?
You can use a control file like this:
$(targetlist) : controlfile
controlfile : $(sourcelist)
do something that generates $(targetlist) from $(sourcelist)
touch controlfile
That way, the 'something' is invoked only once, and all files in $(targetlist)
are marked as up-to-date later, as controlfile is
Hope this helps
Noel
er Envite
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