Module Name:	pkgsrc
Committed By:	reed
Date:		Thu Oct  5 23:35:23 UTC 2006

Modified Files:
	pkgsrc/mk/build: build.mk
	pkgsrc/mk/defaults: mk.conf

Log Message:
Add experimental support for -j jobs building in the build
target.

MAKE_JOBS is undefined by default. You can test this by setting
in mk.conf: MAKE_JOBS=5 for example.

Some package just won't build correctly with this -- these individual
packages can set MAKE_JOBS_SAFE=no to disable it.

This is based on discussion from last December 2005. Some pkgsrc
users are using ideas like this.

Note I have been using this since December 2005 on various single
processor and multiprocessor systems. (Once I kept some stats on
performance but have misplaced that now.) I haved tested this with
many packages (but not a bulk build) on Linux, NetBSD and DragonFly.

This commit doesn't include the commits for the MAKE_JOB_SAFE. As
this is experimental it needs more testing. Some examples of problems
are: comms/lrzsz, databases/gramps2, editors/vim, graphics/MesaLib,
graphics/netpbm, net/bind9, print/ghostscript-esp, textproc/libxml,
and www/lynx.


To generate a diff of this commit:
cvs rdiff -r1.6 -r1.7 pkgsrc/mk/build/build.mk
cvs rdiff -r1.131 -r1.132 pkgsrc/mk/defaults/mk.conf

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.