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From: Mark H Weaver <mhw@netris.org>
Subject: Re: [PATCH] Add Julia.
Date: Thu, 26 Mar 2015 11:19:04 -0400
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In-Reply-To: <87d23xoxp2.fsf@netris.org> (Mark H. Weaver's message of "Wed, 25
	Mar 2015 12:20:57 -0400")
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To: Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de>
Cc: guix-devel <guix-devel@gnu.org>

Mark H Weaver <mhw@netris.org> writes:

> Ricardo Wurmus <ricardo.wurmus@mdc-berlin.de> writes:
>
>> May I suggest adding passing the "DYNAMIC_ARCH=1" flag in openblas
>> instead of propagating non-substitutability to Julia?  When built with
>> "DYNAMIC_ARCH=1" the CPU type can be picked with the environment
>> variable OPENBLAS_CORETYPE=<type>.  If I'm not mistaken this makes
>> substitutions for openblas possible.
>>
>> What do you think?
>
> Yes, we should do this.

When reading this the first time, somehow I managed to miss the fact
that users will have to set OPENBLAS_CORETYPE to their CPU type.  Does
that mean that openblas is unable to detect the CPU type automatically?
What does it do if OPENBLAS_CORETYPE is unset?

Will we have to set it during the build of packages that use openblas,
such as Julia?

    Thanks,
      Mark