Re: [ptxdist] Detect if x86 target is 32 or 64bit?

["Andreas Bießmann" <andreas@biessmann.de>]

Dear Alexander Stein,

On 01.02.12 13:49, Alexander Stein wrote:
> On Tuesday 31 January 2012 15:12:08 Michael Olbrich wrote:
>> On Tue, Jan 31, 2012 at 09:21:30AM +0100, Alexander Stein wrote:
>>> On Wednesday 04 January 2012 17:59:57 Michael Olbrich wrote:
>>>> On Wed, Jan 04, 2012 at 03:27:46PM +0100, Alexander Stein wrote:
>>>>> how can I detect if a x86 target is 32 or 64bit? I'm working on a package 
>>> rule 
>>>>> for gnu-efi and elilo which need to know if it should generate ia32, 
>>> x86_64 
>>>>> (or ia64) binaries.
>>>>> I just know about PTXCONF_ARCH_X86 but this does not show what I want. 
>>> There 
>>>>> is also PTXCONF_KERNEL_ARCH_X86_64 for 64bit but this needs a linux kernel 
>>>>> configured. Any other ideas?
>>>>
>>>> This is not yet supported. You'll need to add ARCH_X86_64 and ARCH_IA64 to
>>>> platforms/architecture.in and set the correct defaults for HAS_HARDFLOAT
>>>> etc.
>>>> Send patches :-)
>>>
>>> I doubt it's the best way to just add ARCH_X86_64 (and maybe ARCH_IA64). A lot 
>>> of rules files use "ifdef PTXCONF_ARCH_X86". So this has to be reworked to be 
>>> useable in X86_64, as most cases don't make a difference to 32 or 64 Bit.
>>> Maybe it's better, to add a 64Bit entry in the optimization. Thoughts?
>>
>> I have no idea which way will be easier to implement. But I don't think
>> adding to the optimization is the best. There will be places where you need
>> to separate 32 vs 64 bit (e.g. SIZEOF_LONG_DOUBLE).
>> So I guess you should start with a (ARCH_X86_32|ARCH_X86_64) choice and
>> check if any "ifdef PTXCONF_ARCH_X86" need to be changed.
>> If there are few/no uses of ARCH_X86 left then we can rename ARCH_X86_32 to
>> ARCH_X86.

is there any conclusion to this discussion?
I startet to build a x86_64 rootfs (on top of i586-qemu-bsp) and failed
to build sylinux due to some wrong decisions in syslinux.make (another
discussion ..).
I started defining ARCH_X86_64 as optimization of ARCH_X86. Alexander,
are you building x86_64 stuff too ore did you only ask cause of the
ability to build gnu-efi for ia32, x86_32 and ia64?

> Another problem prio to this is a 64bit toolchain in ptxdist. Up to now there is no OSELAStoolchain for x86_64.

Can you please test my OSELAS.Toolchain x86_64 patches?

> So I tried to use my host toolchain, but ptxdist cannot detect the sysroot in ptxd_init_sysroot_toolchain.
> At least my host toolchain has no --sysroot configure option set. I will assume an application is for 32bit, at the moment.

best regards

Andreas Bießmann

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