linux-kernel - Re: 2.6.32-rc3: floating-point build failure (undefined reference to `_

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Date:	Wed, 07 Oct 2009 07:23:07 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Andreas Mohr <andi@...as.de>
CC:	linux-kernel@...r.kernel.org, Adam Belay <abelay@...ell.com>,
	linux-acpi@...r.kernel.org
Subject: Re: 2.6.32-rc3: floating-point build failure (undefined reference
 to	`__udivdi3' in menu governor)

Andreas Mohr wrote:
> Hi,
> 
> didn't find any report about this, so...
> 
>   LD      .tmp_vmlinux1
> drivers/built-in.o(.text+0xd85a1): In function `menu_select':
> drivers/cpuidle/governors/menu.c:212: undefined reference to `__udivdi3'
> make: *** [.tmp_vmlinux1] Error 1
> 
> # gcc -v
> Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/3.2.3/specs
> Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --disable-checking --with-system-zlib --enable-__cxa_atexit --host=i386-redhat-linux
> Thread model: posix
> gcc version 3.2.3 20030502 (Red Hat Linux 3.2.3-49)

seems you're the only user of this left.

it's not floating point but a 64 bit division.
The only one I can imagine is the one on line 213

looking at it, can you try sticking (u32) at the end of line 212; that multiply is not very likely to exceed 32 bits


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