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Date: Sun, 12 Nov 2006 02:54:38 +0900
From: Norikatsu Shigemura <nork@FreeBSD.org>
To: des@des.no (Dag-Erling =?UTF-8?B?U23DuHJncmF2?=)
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Cc: freebsd-current@FreeBSD.org, nork@FreeBSD.org,
	Kris Kennaway <kris@obsecurity.org>
Subject: Re: libpthread vs libthr.
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On Sat, 11 Nov 2006 16:16:25 +0100
des@des.no (Dag-Erling Smørgrav) wrote:
> Norikatsu Shigemura <nork@FreeBSD.org> writes:
> > 	In this case, gdm tried to resolve a symbol,
> > 	sched_yield@LIBTHREAD_1_0 instead of sched_yield.  So by changing
> > 	libthr by libmap, gdm couldn't resolve a symbol, sched_yield(2).
> > 	libthr doesn't have a sched_yield@LIBTHREAD_1_0, Yes, libc have
> > 	a sched_yield, but sched_yield@LIBTHREAD_1_0.
> This is not a libthr issue, it's a symbol versioning issue.  Arguably,
> sched_yield should be removed from libpthread's symbol map, because
> it's a wrapper for a syscall and we don't version syscalls.

	Sigh... Yes, it is not a libthr issue and a symbol versioning
	issue, but only a symbol versioning issue.
	(I think it is a issue that libpthread/libthr using SYMVER
	enabled by default.  But TEST is significant:-)

	The point of these issues is a relation of FreeBSD system, kernel
	- libraries - userland(applications).  We don't have a mutually
	commutative layer changing(almost works, but...).  At least, we
	need re-compiling.  At this time, I think that test is not enough.