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Date: Wed, 15 Sep 2010 11:19:52 +0000
From: David Xu <davidxu@freebsd.org>
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To: Alexander Kabaev <kabaev@gmail.com>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r212630 - in head/lib/libthr: . thread
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Alexander Kabaev wrote:
> On Wed, 15 Sep 2010 02:56:33 +0000 (UTC)
> David Xu <davidxu@FreeBSD.org> wrote:
> 
>> Author: davidxu
>> Date: Wed Sep 15 02:56:32 2010
>> New Revision: 212630
>> URL: http://svn.freebsd.org/changeset/base/212630
>>
>> Log:
>>   add code to support stack unwinding when thread exits. note that
>> only defer-mode cancellation works, asynchrnous mode does not work
>> because it lacks of libuwind's support. stack unwinding is not
>> enabled unless LIBTHR_UNWIND_STACK is defined in Makefile.
>>
>> Modified:
>>   head/lib/libthr/Makefile
>>   head/lib/libthr/thread/thr_clean.c
>>   head/lib/libthr/thread/thr_create.c
>>   head/lib/libthr/thread/thr_exit.c
>>   head/lib/libthr/thread/thr_init.c
>>   head/lib/libthr/thread/thr_private.h
>>
>> Modified: head/lib/libthr/Makefile
>> ==============================================================================
>> --- head/lib/libthr/Makefile	Wed Sep 15 01:21:30 2010
>> (r212629) +++ head/lib/libthr/Makefile	Wed Sep 15 02:56:32
>> 2010	(r212630) @@ -25,6 +25,14 @@
>> CFLAGS+=-I${.CURDIR}/../../libexec/rtld-
>> CFLAGS+=-I${.CURDIR}/../../libexec/rtld-elf/${MACHINE_CPUARCH}
>> CFLAGS+=-I${.CURDIR}/../libthread_db CFLAGS+=-Winline
>> +
>> +LIBTHR_UNWIND_STACK=yes
>> +
>> +.ifdef LIBTHR_UNWIND_STACK
>> +CFLAGS+=-I${.CURDIR}/../../contrib/gcc -fexceptions 
>> +CFLAGS+=-D_PTHREAD_FORCED_UNWIND
>> +.endif
>> +
>>
> 
> Reaching into bowels of GCC like that is never good.
Any solution ? ;-)