> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On
> Behalf Of Lane Schwartz
> Sent: Monday, April 12, 2010 9:23 AM
> To: [email protected]
> Subject: Rules with multiple outputs
>
> Hi,
>
> I am trying to solve an issue regarding rules with multiple
> outputs. I would like my makefile to correctly handle these
> rules, so that the generating commands are only run once,
> even when make is run with -j (for parallel). I am aware that
> a solution to handle this is using pattern rules, as in the
> case when generating files using bison (section 10.5.2 GNU
> Make manual). But, in my case the targets that are generated
> tend not to share named patterns.
>
> Here's an example of what I would like to do:
>
> a b c: d
> foo d
What I have done before is to make sure to only explicitly list the
commands for one target, and then list the others as a dependency.
Something like this.
OUTPUTS:=a b c
$(firstword $(OUTPUTS)):
foo d
$(OUTPUTS): d
$(firstword $(OUTPUTS)): $(filter-out $(firstword
$(OUTPUTS)),$(OUTPUTS))
This will make sure the commands are run only once with make -j and
keeps the proper dependencies for all the outputs.
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