Re: [Qemu-devel] [PATCH] clang: Disable warning about expansion to 'defined'

[Peter Maydell]

On 9 August 2016 at 03:35, Pranith Kumar <address@hidden> wrote:
> Clang produces the following warning. The warning is detailed here:
> https://reviews.llvm.org/D15866. Disable the warning.
>
> /home/pranith/devops/code/qemu/hw/display/qxl.c:507:5: warning: macro 
> expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined]
> #if SPICE_NEEDS_SET_MM_TIME
>     ^
> /home/pranith/devops/code/qemu/include/ui/qemu-spice.h:46:5: note: expanded 
> from macro 'SPICE_NEEDS_SET_MM_TIME'
>   (!defined(SPICE_SERVER_VERSION) || (SPICE_SERVER_VERSION < 0xc06))
>     ^
> /home/pranith/devops/code/qemu/hw/display/qxl.c:1074:5: warning: macro 
> expansion producing 'defined' has undefined behavior [-Wexpansion-to-defined]
> #if SPICE_NEEDS_SET_MM_TIME
>     ^
> /home/pranith/devops/code/qemu/include/ui/qemu-spice.h:46:5: note: expanded 
> from macro 'SPICE_NEEDS_SET_MM_TIME'
>   (!defined(SPICE_SERVER_VERSION) || (SPICE_SERVER_VERSION < 0xc06))

Is this the only thing in our code which provokes the warning?
If so, why don't we just fix it to not be undefined behaviour?

thanks
-- PMM