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From: Marcel Apfelbaum <marcel.a@redhat.com>
Date: Fri, 21 Mar 2014 00:41:09 +0200
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Subject: Re: [Qemu-devel] [PATCH for-2.0 V3] tests/acpi-test: do not run
 iasl on big endian machines
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: "Michael S. Tsirkin" <mst@redhat.com>, Alexey Kardashevskiy <aik@ozlabs.ru>, Michael Tokarev <mjt@tls.msk.ru>, QEMU Developers <qemu-devel@nongnu.org>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Andreas =?ISO-8859-1?Q?F=E4rber?= <afaerber@suse.de>, Richard Henderson <rth@twiddle.net>

On Thu, 2014-03-20 at 22:17 +0000, Peter Maydell wrote:
> On 20 March 2014 22:06, Marcel Apfelbaum <marcel.a@redhat.com> 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...
> 
> echo "trivial iasl source" | iasl --compile-options | iasl
> --disassemble-options | grep "error"
> 
> Fill in the handwaving with actual syntax ;-)
Thanks Peter!

Problem with this solution is that if we start from the source,
it will compile into a *wrong* AML (e.g header length will be BE and not LE),
then the disassemble will *succeed* (!!!).
However, the expected AML file will be in the right format and fail :(.

I can use one of the expected AML files, but it would not be elegant
to use a test file in the configuration script.
What about Laszlo's idea? Would something like:
X=$(printf '\336\255\276\357' | od -A n -t x4) be acceptable ?

Thanks,
Marcel

> 
> thanks
> -- PMM