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From: John Baldwin <jhb@freebsd.org>
To: Ed Schouten <ed@80386.nl>
Date: Wed, 21 Mar 2012 09:42:05 -0400
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	Sergey Kandaurov <pluknet@freebsd.org>, src-committers@freebsd.org
Subject: Re: svn commit: r233271 - in head/sys: amd64/conf arm/conf
	i386/conf ia64/conf mips/conf pc98/conf powerpc/conf sparc64/conf
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On Wednesday, March 21, 2012 6:44:09 am Ed Schouten wrote:
> Hi Sergey,
> 
> * Sergey Kandaurov <pluknet@freebsd.org>, 20120321 11:18:
> > Will this affect old binaries like misc/mc build for e.g. 6.x running on 
GENERIC
> > w/o kldoaded pty(4), so that I will have to `kldload pty'?
> > Currently executing old mc results in emitting the following kernel 
message:
> > 
> > pid 11948 (mc) is using legacy pty devices - not logging anymore
> 
> If it's dynamically linked against libc and libutil, it's not a problem.
> Otherwise you need to rebuild mc(1). If rebuilding mc(1) doesn't help,
> let me know and I'll take a look at the port.
> 
> If apps print the "is using legacy pty devices" message, you probably
> need to load pty(4).

6.x predates the symbol versioned libc, so even if it is dynamically linked it 
is still using older versions of the pty lookup routines.  It will likely need
pty(4) forever.  Perhaps you could enable pty(4) by default if one of the
relevant COMPAT_FREEBSD options is included?

-- 
John Baldwin