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Subject: Re: [OMPI devel] [PATCH] Open MPI on ARMv5
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2012-05-04 06:51:20

What I need to know in the immediate future is: does this affect the new patch that we just put in the 1.6rc2 tarball?

Meaning: I want to release 1.6 in the immediate future. Is this a blocker? If so, how fast can we get a fix?

On May 2, 2012, at 6:07 PM, Evan Clinton wrote:

> What I mean to say is that, as far as I can tell, in Open MPI's
> configure stuff there's a switch based on what it detects the host
> processor as (and this detection could be overridden by specifying the
> --host= thing); this is probably not the best way to do it.
> (sorry for the double-post again, dangit)
> On Wed, May 2, 2012 at 5:52 PM, Peter Robinson <pbrobinson_at_[hidden]> wrote:
>> On Wed, May 2, 2012 at 10:38 PM, Evan Clinton <evan.m.clinton_at_[hidden]> wrote:
>>>> The Fedora guys are having trouble building the armv5tel variant (well, they did before this patch too, but... :)
>>> Ah, I think the problem is that the build system is not playing nicely
>>> with cross-compiles (which it looks like that's doing (specifically,
>>> in that case, compiling for armv5 on an armv7 box)). I think an
>>> immediate workaround would be to do ./configure
>>> --host=armv5tel-unknown-linux-gnueabi or similar (in addition to
>>> specifying the target -march). I think you'd need to specify the
>>> --host in a similar manner for any cross-compile of Open MPI?
>> It's not cross compiling, it's native compile although it might be
>> underlying armv7 device but it's running a armv5tel userspace.
>> Ultimately for distribution compile platforms it should be paying
>> attention to what the build system is telling it to compile for not
>> the underlying device because it's built once and could be run on any
>> number of devices.
>> Peter

Jeff Squyres
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