linux-kernel - Re: [2.6.30-rc8] gcc 3.3 : _

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Date:	Fri, 05 Jun 2009 12:39:06 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, xiyou.wangcong@...il.com
Subject: Re: [2.6.30-rc8] gcc 3.3 : __udivdi3 undefined.

Andrew Morton wrote:
> Do
> 
> 	make arch/x86/mm/pageattr.s
> 
> then have a look in pageattr.s to find the __udivdi3 callsite.
> 
> It might not even be in arch/x86/mm/pageattr.o at all.  If not, keep
> building .s files in that directory until you find it.
> 
> Building with CONFIG_DEBUG_INFO=1 will allow you to find the exact C
> file-n-line where the __udivdi3() call is being emmitted (look at the
> .loc lines).

$ make -k CONFIG_DEBUG_INFO=1 `echo arch/x86/mm/*.c | sed -e 's/\.c/.s/g'`
(...snipped...)
$ grep __udivdi3 arch/x86/mm/*.s
arch/x86/mm/memtest.s:.globl __udivdi3
arch/x86/mm/memtest.s:  call    __udivdi3



Tetsuo Handa wrote:
> "make allnoconfig" compiles fine. Maybe config dependent?
It was because "make allnoconfig" skips arch/x86/mm/memtest.c .
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