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Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values |
Date: |
Tue, 17 Nov 2015 11:52:17 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 |
On 11/17/15 11:43, Paolo Bonzini wrote:
>
>
> On 17/11/2015 11:41, Laszlo Ersek wrote:
>>> If and when this happens we will add "-fno-strict-overflow" for clang,
>>> just like we are using "-fno-strict-aliasing" already.
>>
>> How about adding "-fwrapv -fno-strict-overflow" right now? (Spelling out
>> the latter of those explicitly for pointer arithmetic.)
>
> If it makes the change to HACKING more palatable, I'm all for it.
In general I'm not overly happy about this change :), but, if the
consensus is that we simply don't want to worry about this kind of UB in
QEMU, then let's actually prevent the compiler from exploiting the
standard's lenience, rather than just suppress the warning.
Thanks!
Laszlo
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, (continued)
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values,
Laszlo Ersek <=
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Markus Armbruster, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Peter Maydell, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Paolo Bonzini, 2015/11/17
- Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Laszlo Ersek, 2015/11/17
Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values, Markus Armbruster, 2015/11/17