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Date:      Thu, 03 Oct 2024 05:46:33 +0000
From:      bugzilla-noreply@freebsd.org
To:        desktop@FreeBSD.org
Subject:   [Bug 272173] graphics/opencv ATLAS knob cannot depend on cblas and cmake cannot find lapacke for this knob
Message-ID:  <bug-272173-39348-u0Ie5NcxKk@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-272173-39348@https.bugs.freebsd.org/bugzilla/>
References:  <bug-272173-39348@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D272173

Jason E. Hale <jhale@FreeBSD.org> changed:

           What    |Removed                     |Added
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              Flags|maintainer-feedback?(deskto |maintainer-feedback+
                   |p@FreeBSD.org)              |
                 CC|                            |jhale@FreeBSD.org

--- Comment #1 from Jason E. Hale <jhale@FreeBSD.org> ---
(In reply to alt2600 from comment #0)

Sorry for the delayed response. I'm working on updating opencv to 4.10.0 an=
d am
just trying to close some open PRs pertaining to it in the process.

Do you have a particular reason for using atlas over openblas? The atlas
project has been dead for many years and I was thinking of dropping support=
 for
it in opencv.

> Anyway, noticed cblas and atlas-math cannot coexist, cblas says things ar=
e broken, they clobber.
Once upon a time, math/cblas and math/atlas installed headers into the same
place, but this doesn't seem to the case anymore after [1]. I think the
CONFLICTS line in math/atlas/Makefile is a leftover and can be removed. Atl=
as
doesn't have an active maintainer, so these things can happen.

> after clearing this depend and checking the configure's output I noticed =
lapack wasn't being found, actually lapacke, so had to force its path using=
 a CMAKE_ON with Atlas_CLAPACK_INCLUDE_DIR.
This makes sense. The atlas-math package doesn't install a lapacke.h, so it
wouldn't be found in Atlas_INCLUDE_SEARCH_PATHS. Atlas_CLAPACK_INCLUDE_DIR
needs to be pointed to the lapacke.h installed by math/lapacke.

> Its possible openblas maybe has this issue?
Openblas installs its own cblas.h and lapacke.h which opencv detects and us=
es.
The BUILD_DEPENDS for cblas and lackpacke are ultimately unneeded/unused for
the OPENBLAS option and will be removed in the 4.10.0 update.

[1]
https://cgit.freebsd.org/ports/commit/?id=3Dc2488a6020830af2cf09699b887adec=
7af806bf3

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