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Date:      Sat, 17 Nov 2018 01:06:47 +0000
From:      bugzilla-noreply@freebsd.org
To:        ports-bugs@FreeBSD.org
Subject:   [Bug 227294] math/openblas: why has to be built manually?
Message-ID:  <bug-227294-7788-Iq2ycl2xOP@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-227294-7788@https.bugs.freebsd.org/bugzilla/>
References:  <bug-227294-7788@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227294

Pavel Minaev <int19h@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |int19h@gmail.com

--- Comment #2 from Pavel Minaev <int19h@gmail.com> ---
Even with DYNAMIC_ARCH enabled, OpenBLAS still tries to do CPU detection on=
 the
build machine, and fails if the CPU type is unknown (note that this means t=
hat
it'll only manifest on machines with CPUs it is not aware of, which is prob=
ably
why this isn't happening for official package builds).

According to this bug in OpenBLAS tracker, this is by design:
https://github.com/xianyi/OpenBLAS/issues/1027

Their suggested workaround is to explicitly set the CPU type to some
low-featured CPU when building with DYNAMIC_ARCH (the actual CPU doesn't
actually matter, since it builds support for all of them - but at least it
allows the build to proceed).

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