Re: [Qemu-devel] [PATCH for 2.5] QEMU does not care about left shifts of signed negative values

[Paolo Bonzini]

On 17/11/2015 11:55, Peter Maydell wrote:
> If you pass clang -fwrapv then this causes -fsanitize=undefined to
> no longer complain about signed integer overflows from addition.
> However the sanitizer will still complain about left shifts of
> negative values. The conclusion I draw is that clang (as per
> the documentation) applies fwrapv only to addition &c, not to
> shifts.

Ok, I'll open a bug for this.  It's probably unintended, they've already
fixed -fwrapv once for pointers.

Paolo