Re: multiple percent signs in single prerequisite - revisited

[Peter Apian-Bennewitz]

the work-around works like a charm, thanks for speedy solution,
best, Peter

On 7/19/22 16:05, Paul Smith wrote:
> On Tue, 2022-07-19 at 08:44 +0200, Peter Apian-Bennewitz wrote:
> > A rule like
> >
> >        %.mp4: %/%.mov
> > or
> >       %.mp4: foo_%_%.bar
> >
> > substitutes only the first % while looking for matching
> > prerequisites. - why ?
> Because that's the way it was implemented, and documented, and that's
> the way it's always worked...
>
> I know of no reason other than that's how Roland (or RMS?  Not sure who
> created pattern rules back in the day) did it.  At this point there
> would be a backward-compatibility problem with trying to change it.
>
> You can get around this if you use secondary expansion[1] capabilities:
>
>    .SECONDEXPANSION:
>
>    %.mp4: $$*/$$*/mov
>
> or
>
>    %.mp4: foo_$$*_$$*.bar
>
>
>
> [1] https://www.gnu.org/software/make/manual/html_node/Secondary-Expansion.html