Re: [Qemu-devel] [PATCH] util/cacheinfo: Fix warning generated by clang

[Emilio G. Cota]

On Fri, Jun 30, 2017 at 11:39:46 -0400, Pranith Kumar wrote:
> Clang generates the following warning on aarch64 host:
> 
>   CC      util/cacheinfo.o
> /home/pranith/qemu/util/cacheinfo.c:121:48: warning: value size does not 
> match register size specified by the constraint and modifier 
> [-Wasm-operand-widths]
>         asm volatile("mrs\t%0, ctr_el0" : "=r"(ctr));
>                                                ^
> /home/pranith/qemu/util/cacheinfo.c:121:28: note: use constraint modifier "w"
>         asm volatile("mrs\t%0, ctr_el0" : "=r"(ctr));
>                            ^~
>                            %w0
> 
> Constraint modifier 'w' is not (yet?) accepted by gcc. Fix this by increasing 
> the ctr size.
> 
> Signed-off-by: Pranith Kumar <address@hidden>

I can reproduce with clang 3.9.1.

Tested-by: Emilio G. Cota <address@hidden>
Reviewed-by: Emilio G. Cota <address@hidden>

Thanks,

                Emilio