Date: Sat, 10 Oct 1998 17:48:23 +0800 From: Peter Wemm <peter@netplex.com.au> To: Robert Nordier <rnordier@nordier.com> Cc: jkh@time.cdrom.com (Jordan K. Hubbard), skynyrd@opus.cts.cwu.edu, rnordier@FreeBSD.ORG, committers@FreeBSD.ORG Subject: Re: cvs commit: src/sys/boot/i386 Makefile Message-ID: <199810100948.RAA15045@spinner.netplex.com.au> In-Reply-To: Your message of "Sat, 10 Oct 1998 11:52:55 %2B0200." <199810100952.LAA10684@ceia.nordier.com>
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Robert Nordier wrote:
> Jordan K. Hubbard wrote:
> > > (I've gone with another of your suggestions, and the new boot2
> > > supports both a.out and ELF, which means an ELF /boot/loader binary
> > > is feasible.)
> > >
> > > So for /sys/boot/i386/Makefile, I suggest we do something like:
> > >
> > > .MAKEFLAGS: BTXLDFMT=${OBJFORMAT} OBJFORMAT=elf
> >
> > Hmmm. Is that really the right makefile for it?
>
> Well, it works. But (assuming your question was rhetorical), what do
> you prefer?
The cleanest way would be something like this:
# $Id$
#
OBJFORMAT?=foo
PROG= xx
...
.include <bsd.prog.mk>
However, this requires that bsd.own.mk be included from the other bsd.*.mk
files instead of sys.mk. This is a major thing, because all the makefiles
that do conditional things based on variables would have trouble because
they wouldn't be defined until later.
ie, something like this would be needed:
# $Id$
OBJFORMAT?= aout
.include <bsd.own.mk> # get definition of $LIBDIR, read /etc/make.conf
.if exists(${LIBDIR}/libfoo.a)
xxx
.endif
.include <bsd.prog.mk>
Without the early include of bsd.own.mk, things like $LIBDIR would be
undefined when it mattered.. This has major pain implications for the
build tree, we've got loads of such hacks around the place.
But for now, using .MAKEFLAGS: works because it's inherited by the child
make processes, and the variables in the subdirs will be set correctly.
It cannot work properly by adding it to a Makefile that builds something
because too many things will have been already set as a result of sys.mk.
> --
> Robert Nordier
Cheers,
-Peter
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