Date: Wed, 8 May 2013 15:53:02 -0700 From: "Simon J. Gerraty" <sjg@juniper.net> To: Warner Losh <imp@bsdimp.com> Cc: Garrett Cooper <yanegomi@gmail.com>, freebsd-toolchain@freebsd.org, "freebsd-arch@FreeBSD.org Arch" <freebsd-arch@freebsd.org> Subject: Re: [RFC] adding a variable to .mk and Makefile.inc1 to point to top of the FreeBSD source tree Message-ID: <20130508225302.DF7AE58097@chaos.jnpr.net> In-Reply-To: <9CD1CE3E-C17C-4C63-BA03-190531185D7A@bsdimp.com> References: <CAGH67wS21otQr1fBqQ2z=XQjUV30QUjdtyAkzC_Tf1Ts%2BPq%2B8g@mail.gmail.com> <20130507213118.5277F58097@chaos.jnpr.net> <D6BADC3E-CCC4-4D85-8857-FB6BAAFBB820@bsdimp.com> <20130508054121.DCA7258097@chaos.jnpr.net> <9CD1CE3E-C17C-4C63-BA03-190531185D7A@bsdimp.com>
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On Wed, 8 May 2013 15:49:12 -0600, Warner Losh writes:
>> MAKEOBJDIR=3D'${.CURDIR:S,${SRCTOP},${OBJTOP},}'
>>=20
>> which gives you a similar - but much neater result than
>> MAKEOBJDIRPREFIX.
>
>Isn't that backwards. MAKEOBJDIRPREFIX in today's FreeBSD is much more =
>like OBJTOP than what you've quoted here. That's how I set the top of =
No. MAKEOBJDIRPREFIX gives you an objdir by simply doing
${MAKEOBJDIRPREFIX}${.CURDIR}
this is very quick and handy, but the paths can be very long and ugly if
you happen to be on automounted nfs.
For the sake of discussion assume I am in
/.amd/server/b/sjg/work/FreeBSD/current/src/bin/cat
MAKEOBJDIRPREFIX=/var/obj/current/$MACHINE make -V .OBJDIR
/var/obj/current/amd64/.amd/server/b/sjg/work/FreeBSD/current/src/bin/cat
MAKEOBJDIR='${.CURDIR:S,${SRCTOP},${OBJTOP},}' make -V .OBJDIR
/var/obj/current/amd64/bin/cat
(assuming of course that OBJTOP='${OBJROOT}${MACHINE}' as previously
mentioned).
The ability to do the above is something I added to NetBSD's make ages
ago because we found that MAKEOBJDIRPREFIX resulted in
pathnames that were blowing the command line limits on FreeBSD 2.x
>the tree today, usually with a 'setenv MAKEOBJDIRPREFIX $HOME/obj' in my =
>.cshrc so it is always active. That way I can just buildworld or =
Yes, MAKEOBJDIRPREFIX is certainly very handy - and I use it for quick &
dirty builds and of course for buildworld and such.
>problems with /usr/obj being unwritable... I know this trick doesn't =
>work for netbsd's make (or didn't years ago when I was building it on a =
What trick? MAKEOBJDIRPREFIX has always worked as you describe.
Don't confuse limitations imposed by makefiles as being limitations of
the tool ;-)
>The project currently uses dots without issue. Not quite sure why you'd =
The project doesn't currently do anything close to what dirdeps.mk
allows.
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