On Thu, Mar 27, 2014 at 11:05:00AM -0600, Warner Losh wrote: > On Mar 26, 2014, at 4:30 PM, Dimitry Andric <d...@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 _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"