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Subject: Re: Makefile and nested variables question
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To: Johannes Lundberg <johalun0@gmail.com>,
 freebsd-current <freebsd-current@freebsd.org>
References: <CAECmPwv2+acPz=KdWgPHEC-kSF4GNN62O3ZEXhXYKT0BjCVXXw@mail.gmail.com>
From: Bryan Drewery <bdrewery@FreeBSD.org>
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Date: Fri, 9 Feb 2018 15:59:50 -0800
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From: Bryan Drewery <bdrewery@FreeBSD.org>
To: Johannes Lundberg <johalun0@gmail.com>,
 freebsd-current <freebsd-current@freebsd.org>
Message-ID: <02523ce9-4771-e63f-1c0e-735998bf1f67@FreeBSD.org>
Subject: Re: Makefile and nested variables question
References: <CAECmPwv2+acPz=KdWgPHEC-kSF4GNN62O3ZEXhXYKT0BjCVXXw@mail.gmail.com>
In-Reply-To: <CAECmPwv2+acPz=KdWgPHEC-kSF4GNN62O3ZEXhXYKT0BjCVXXw@mail.gmail.com>

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On 2/9/2018 9:02 AM, Johannes Lundberg wrote:
> Hi
>=20
> Is there some way to use nested variables in the dependency line like s=
o:
>=20
> ${OBJS}: ${${.TARGET:S/$/_DEPS/}}
>=20
> In my case I get nothing..
>=20

I think I need more details. That line won't work. ${.TARGET} is only
defined *in a running target*, not while declaring dependencies.

If these OBJS are C files then this syntax may be enough to only declare
the dependencies when really needed.
  OBJS_DEPEND_GUESS.foo.o +=3D bar.h bar.c
Rather than what I think you tried:
  foo.o_DEPS +=3D bar.h bar.c

If you want them declared always (ignoring .depend files) then just:
  foo.o: bar.h bar.c

--=20
Regards,
Bryan Drewery


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