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Date: Sat, 28 Mar 2015 10:36:13 -0700
From: John-Mark Gurney <jmg@funkthat.com>
To: Eric van Gyzen <vangyzen@freebsd.org>
Subject: Re: SSE in libthr
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Cc: current@freebsd.org, Rui Paulo <rpaulo@me.com>
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Eric van Gyzen wrote this message on Fri, Mar 27, 2015 at 17:43 -0400:
> On 03/27/2015 16:49, Rui Paulo wrote:
> >
> > Regarding your patch, I think we should disable even more, if possible.  How about:
> >
> > CFLAGS+=        -mno-mmx -mno-3dnow -mno-sse -mno-sse2 -mno-sse3
> 
> Yes, I was considering copying all of the similar flags that we use in the
> kernel.  That seems wise.  According to comments in sys/conf/kern.mk, only
> no-mmx and no-sse would be necessary, as they imply the others.
> 
> dim@ raised the possibility of CPUTYPE=foo on i386, so I would also apply this
> change to i386.
> 
> An updated patch is below.

We should probably add a $(CFLAGS_NOFPU) define and use that.. Then it
can be properly tweaked per compiler and per arch as necessary instead
of hardcoding the selection in each makefile...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."