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Date: Mon, 31 Mar 1997 13:34:10 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199703310334.NAA25635@godzilla.zeta.org.au>
To: current@freebsd.org, scrappy@hub.org
Subject: Re: make -j3 on make world?
Sender: owner-current@freebsd.org
X-Loop: FreeBSD.org
Precedence: bulk

>	In reply to my own email, I did some playing around last night
>with the /usr/share/mk/* files, bsd.subdir.mk in particular, and came
>up with:
>
>_SUBDIRUSE: .USE
>        @for entry in ${SUBDIR}; do \
>                (if test -d ${.CURDIR}/$${entry}.${MACHINE}; then \
>                        ${ECHODIR} "===> ${DIRPRFX}$${entry}.${MACHINE}"; \
>                        edir=$${entry}.${MACHINE}; \
>                        cd ${.CURDIR}/$${edir}; \
>                else \
>                        ${ECHODIR} "===> ${DIRPRFX}$$entry"; \
>                        edir=$${entry}; \
>                        cd ${.CURDIR}/$${edir}; \
>                fi; \
>                ${MAKE} ${MAKEFLAGS} ${.TARGET:realinstall=install} DIRPRFX=${DIRPRFX}$$edir/); \
>        done
>
>
>	The only change is adding ${MAKEFLAGS} to the ${MAKE} line so
>that the -j3 flag carried down into the subdir's, so that make world
>works with parellel make...
>
>	Is there any reason that I'm overlooking why this *shouldn't*
>be done this way?  If not, and there are no arguments against it, I'd
>like to make the change a permanent feature...?

Yes, you're overlooking the bug in make that causes this behaviour.  -j
only works when it is specified on the command line.  When it is inherited
in ${MAKEFLAGS}, it is ignored because ${MAKEFLAGS} is parsed as a second
command line, and parsing of the real command line earlier sets the -B flag.

Don't change bsd.subdir.mk.

Bruce