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Re: [Qemu-devel] [PATCH] configure: Always compile with -fwrapv
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From: |
Peter Maydell |
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Subject: |
Re: [Qemu-devel] [PATCH] configure: Always compile with -fwrapv |
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Date: |
Mon, 12 Sep 2016 17:22:55 +0100 |
On 12 September 2016 at 16:04, Markus Armbruster <address@hidden> wrote:
> If I remember correctly, we discussed -fno-strict-overflow (which the
> kernel uses), but in the end opted for the more stringent -fwrapv.
Yep. -fno-strict-overflow just says "don't do bad things on
integer overflow (but it's still a bug in the program if it
happens)", so overflows are still program bugs and
the compiler/sanitizer will still complain about them.
You need -fwrapv to say "overflows aren't bugs at all".
thanks
-- PMM