Re: target specific variables in makefiles
Quoting Colin Watson <cjwatson@debian.org> (2003-09-09 00:50:24 BST):
> On Mon, Sep 08, 2003 at 07:22:02PM -0400, Neil Roeth wrote:
> > I recently read about target-specific variables in make, so I thought I could
> > do this:
> >
> > pkg1-stamp: pkg1
> > pkg2-stamp: pkg2
> >
> > %-stamp: $(@:%-stamp=%)
> > touch $@
> >
> > pkg1: DH_OPTIONS=-p$@
> > ...
> > dh_install
> > dh_installxfonts
> > ...
> >
> > pkg2: DH_OPTIONS=-p$@
> > ...
> > dh_install
> > dh_installemacsen
> > ...
> >
> > and avoid the extra call to make, but I get an error:
> > "*** commands commence before first target. Stop."
>
> Lines containing target-specific variables can't be followed by
> commands, I think, so you need to name the target again:
>
> pkg1: DH_OPTIONS=-p$@
> pkg1: any-other-prerequisites-of-pkg1
> ...
>
> pkg2: DH_OPTIONS=-p$@
> pkg2: any-other-prerequisites-of-pkg2
> ...
>
> If you want a real-life example, I can unashamedly plug the groff
> package, although I've just noticed that the DH_EXCLUDE := -Ngroff-x11
> stuff is now obsolete.
In addition to this, I think you need to 'export DH_OPTIONS' to make
this work. Otherwise it won't be in the environment at all, whatever
it's set to ;)
--
Andrew Stribblehill <ads@debian.org>
Systems programmer, IT Service, University of Durham, England
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