Re: [Qemu-devel] [PATCH for-2.0 V3] tests/acpi-test: do not run iasl on big endian machines

[Marcel Apfelbaum <marcel.a@redhat.com>]

On Thu, 2014-03-20 at 23:26 +0100, Laszlo Ersek wrote:
> On 03/20/14 23:06, Marcel Apfelbaum wrote:
> > On Thu, 2014-03-20 at 22:57 +0100, Paolo Bonzini wrote:
> >> Il 20/03/2014 22:14, Marcel Apfelbaum ha scritto:
> >>> +# All known versions of iasl on BE machines are broken.
> >>> +# TODO: add detection code once a non-broken version makes an appearance.
> >>> +if ($iasl -h > /dev/null 2>&1) &&
> >>> +   (lscpu | grep "Byte Order" | grep --quiet "Little Endian" ); then
> >>
> >> lscpu is not portable.
> > I am open to suggestions...
> > I'll try to come up with something else.
> 
> The printf and od utilities are portable. You can use printf to print a
> character string, and use od to group that character string into
> multibyte integers in the native byte order.
> 
> Example:
> 
>   X=$(printf '\336\255\276\357' | od -A n -t x4)
Hi Laszlo,
Thanks for the help!

I've seen something like that somewhere, but I didn't quite like it.
I was looking for something more elegant as I was *almost* sure
this kind of solution will not pass the reviews :)

But maybe I'll try this, let's see what happens,
Thanks!
Marcel

> 
> This sets X to " efbeadde" on little endian, and " deadbeef" on big endian.
> 
> Laszlo