Bug#764491: About pkg-config for BLAS/LAPACK

[Alastair McKinstry]

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Hi Sebastian
On 10/10/2014 20:18, Sébastien Villemot wrote:
> Hi Alastair,
>
> I saw your reports about adding pkg-config support for BLAS and LAPACK
> implementations (#764372 and #764491).
>
> I am basically in agreement with this change, but I don't have the time
> to take care of it before the jessie freeze.
>
> So, if you want to have this change in Jessie, feel free to do a Team
> Upload (or a DELAY/0 NMU if you're not in the Debian Science Team).
> However, if you do that, please also make similar changes at the same
> time to atlas (adding both a blas-atlas.pc and lapack-atlas.pc) and to
> lapack (adding a lapack-netlib.pc).
Thanks, I will do so when I've added a lapack patch.
>
> Also, I don't think that cblas.pc is the right name for the blas package
> pkg-config file (cblas is a C interface to the Fortran 77 BLAS
> routines). I would rather call that file blas-netlib.pc.
I agree, blas-netlib.pc is better and more consistent.
>
> For the openblas case, I don't think it makes much sense to set libdir
> to /usr/lib/openblas (though it does not harm), since actually the
> symlink /usr/lib/libblas.a will point to the right place.
It is possible that openblas is installed and the symlink is manually
set for netlib, for example. In this case using pkg-config blas-openblas
would give the wrong results.
>
> Finally, I don't understand why you say that your .pc file for OpenBLAS
> enables linking to OpenBLAS both generically and explicitly. Actually,
> it only enables generic linking to a BLAS alternative. The specific
> linking to OpenBLAS is provided by /usr/lib/libopenblas.so.0 (which has
> a different SONAME).
>
Ah, I didn't realise that /usr/lib/openblas/libblas.so provided the
libblas.so
SONAME.  Thanks, I withdraw that statement.

regards
Alastair


- -- 
Alastair McKinstry, <alastair at sceal.ie>, <mckinstry at debian.org>,
https://diaspora.sceal.ie/u/amckinstry
A decent provision for the poor is the true test of civilization.
~Samuel Johnson, Boswell: Life of Johnson
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