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From: John Baldwin <jhb@freebsd.org>
To: "Jonathan T. Looney" <jtl@freebsd.org>
Cc: Randall Stewart <rrs@netflix.com>, Ed Maste <emaste@freebsd.org>,
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Subject: Re: svn commit: r292309 - in head/sys: modules modules/tcp
 modules/tcp/fastpath netinet netinet/tcp_stacks
Date: Wed, 16 Dec 2015 08:15:38 -0800
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On Wednesday, December 16, 2015 10:58:47 AM Jonathan T. Looney wrote:
> On Dec 16, 2015, at 10:08 AM, Randall Stewart <rrs@netflix.com> wrote:
> > Ahh I think I see this is a difference between our friend
> > clang and gcc.. since I bet ppc uses gcc not clang :-o
> 
> This sort of thing seems to happen often enough that it would be nice if
> there was an option to automatically build two kernels, one with each
> compiler. Is there already such an option?

make tinderbox effectively does that, but at a bit more expense.  amd64
doesn't build GCC 4.2 by default, so the simplest way is to build a kernel
for a non-clang platform, e.g.:

make TARGET=sparc64 kernel-toolchain
make TARGET=sparc64 buildkernel

(Note you only need to do the kernel-toolchain step once or after toolchain
changes like compiler upgrades.)

-- 
John Baldwin