svn commit: r263778 - in head: bin lib lib/clang sbin share/mk usr.bin usr.sbin
Jilles Tjoelker
jilles at stack.nl
Thu Mar 27 18:12:49 UTC 2014
On Thu, Mar 27, 2014 at 11:05:00AM -0600, Warner Losh wrote:
> On Mar 26, 2014, at 4:30 PM, Dimitry Andric <dim at freebsd.org> wrote:
> > Author: dim
> > Date: Wed Mar 26 22:30:38 2014
> > New Revision: 263778
> > URL: http://svnweb.freebsd.org/changeset/base/263778
> > Log:
> > Add a SUBDIR_PARALLEL option to bsd.subdir.mk, to allow make to process
> > all the SUBDIR entries in parallel, instead of serially. Apply this
> > option to a selected number of Makefiles, which can greatly speed up the
> > build on multi-core machines, when using make -j.
> > This can be extended to more Makefiles later on, whenever they are
> > verified to work correctly with parallel building.
> Why not have this ‘opt out’ rather than ‘opt in’ like it is now? Are
> there any known bad dependencies this introduces?
I'm paranoid about build systems ;) It is easy to add dependencies
across directories and as long as directories are built in sequence,
nothing goes wrong.
In fact, I had enabled SUBDIR_PARALLEL in sys/modules/Makefile as well,
but this caused mysterious failures with some kernels such as mips
ADM5120.
--
Jilles Tjoelker
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