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Date: Thu, 20 Mar 2014 23:26:47 +0100
From: Laszlo Ersek <lersek@redhat.com>
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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: Marcel Apfelbaum <marcel.a@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>
Cc: peter.maydell@linaro.org, mst@redhat.com, aik@ozlabs.ru, mjt@tls.msk.ru, qemu-devel@nongnu.org, stefanha@redhat.com, afaerber@suse.de, rth@twiddle.net

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)

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

Laszlo