Re: creating multiple outputs with a tool in one step

[Oleksandr Gavenko]

On 2010.02.06 19:53, Maxim Yegorushkin wrote:
> On 25/01/10 08:59, Oleksandr Gavenko wrote:
> > On 2010.01.24 16:04, James McElhannon wrote:
> > > Suppose I have a file A that is dependent on B and C. I have a tool,
> > > mytool, that can create B and C at one time from their respective
> > > sources. When making A, I would want make to do "mytool B C" as one of
> > > its steps.
> >
> > Sorry GNU make does not support this directly.
>
> It does. See example 3 on
> http://www.gnu.org/software/make/manual/make.html.gz#Pattern-Examples
Wow, I thing than know all, but not!

From manual:

Pattern rules may have more than one target. Unlike normal rules, this 
does not act as many different rules with the same prerequisites and 
commands. If a pattern rule has multiple targets, make knows that the 
rule's commands are responsible for making all of the targets.

So

%.tab.c %.tab.h: %.y
    bison -d $<

for my.tab.c and my.tab.h run bison only once!

--
С уважением, Александр Гавенко.