Re: [Qemu-devel] [PATCH 1/8] target-arm: Fixes for several shift instructions: VRSHL, VRSHR, VRSHRN, VSHLL, VRSRA.

[Christophe Lyon <christophe.lyon@st.com>]

On 31.01.2011 10:44, Aurelien Jarno wrote:
> On Mon, Jan 31, 2011 at 10:35:30AM +0100, Christophe Lyon wrote:
>> On 31.01.2011 09:20, Aurelien Jarno wrote:
>>> On Fri, Jan 28, 2011 at 04:50:59PM +0100, christophe.lyon@st.com wrote:
>>>> From: Christophe Lyon <christophe.lyon@st.com>
>>>>
>>>> Handle corner cases where the addition of the rounding constant could
>>>> cause overflows.
>>>
>>> After applying this patch, I get the following gcc warning:
>>>   CC    translate.o
>>> cc1: warnings being treated as errors
>>> qemu/target-arm/translate.c: In function ‘disas_neon_data_insn’:
>>> qemu/target-arm/translate.c:4212: error: ‘imm’ may be used uninitialized in this function
>>> make: *** [translate.o] Error 1
>>>
>>
>> Which GCC version are you using? I don't have such a warning (using GCC-4.5.1 on x86_64).
>>
> 
> I get this error with GCC 4.3.5, GCC 4.4.5, GCC 4.5.2 and GCC 4.6.0 
> (r169270). This is also on x86_64.
> 

Well, I can't reproduce this error :-(
For the record, I configure with --target-list=arm-softmmu,arm-linux-user --disable-bluez --enable-debug --disable-sdl and point --host-cc and --cc to GCC-4.5.1.

In verbose mode, I confirm that GCC is invoked with
-Werror -m64 -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wendif-labels -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fstack-protector-all -Wmissing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits

I have tried from a freshly cloned qemu.git, and I have no error.
Can you send me your translate.c & translate.i (pre-processed by GCC's C-preprocesssor with -E option)

Christophe.