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From: Garrett Cooper <yaneurabeya@gmail.com>
Subject: Re: svn commit: r253002 - head
Date: Sun, 7 Jul 2013 14:01:01 -0700
To: Alfred Perlstein <alfred@FreeBSD.org>
Cc: "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>,
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Why the magic number 12?

Sent from my iPhone

On Jul 7, 2013, at 1:39 PM, Alfred Perlstein <alfred@FreeBSD.org> wrote:

> Author: alfred
> Date: Sun Jul  7 20:39:11 2013
> New Revision: 253002
> URL: http://svnweb.freebsd.org/changeset/base/253002
>=20
> Log:
>  Document tip on how to build all kernels quickly.
>=20
> Modified:
>  head/Makefile
>=20
> Modified: head/Makefile
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
> --- head/Makefile    Sun Jul  7 19:58:14 2013    (r253001)
> +++ head/Makefile    Sun Jul  7 20:39:11 2013    (r253002)
> @@ -32,6 +32,12 @@
> # targets             - Print a list of supported TARGET/TARGET_ARCH pairs=

> #                       for world and kernel targets.
> # toolchains          - Build a toolchain for all world and kernel targets=
.
> +#=20
> +# "quick" way to test all kernel builds:
> +#    _jflag=3D`sysctl -n hw.ncpu`
> +#    _jflag=3D$(($_jflag * 2))
> +#    [ $_jflag -gt 12 ] && _jflag=3D12
> +#    make universe -DMAKE_JUST_KERNELS JFLAG=3D${jflag}
> #
> # This makefile is simple by design. The FreeBSD make automatically reads
> # the /usr/share/mk/sys.mk unless the -m argument is specified on the
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