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Subject: Re: enabling cpu "features" in custom kernel
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From: Dimitry Andric <dim@FreeBSD.org>
In-Reply-To: <2fa5c2cb-81eb-d44a-3011-db27035e7965@herveybayaustralia.com.au>
Date: Fri, 17 Jun 2016 12:20:21 +0200
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References: <2fa5c2cb-81eb-d44a-3011-db27035e7965@herveybayaustralia.com.au>
To: Da Rock <freebsd-hackers@herveybayaustralia.com.au>
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On 16 Jun 2016, at 14:35, Da Rock =
<freebsd-hackers@herveybayaustralia.com.au> wrote:
>=20
> I'm just trying to get my head around kernel building and clang.
>=20
> If I want to enable certain features available on my cpu which are =
available by clang, how do I enable them? As I understand it using =
ccflags is a no no (ie /etc/make.conf), so how do I go about enabling =
them? I seem to be missing something in my research here...

You can set CPUTYPE in /etc/make.conf, for example:

CPUTYPE?=3Dbroadwell

then it will be automatically picked up in the correct places during
buildworld, or during ports building.

See also make.conf(5) and /usr/share/examples/etc/make.conf.

-Dimitry


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