From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ricardo Wurmus Subject: Re: R Date: Fri, 5 Feb 2016 21:48:24 +0100 Message-ID: <87lh6yx4rr.fsf@mdc-berlin.de> References: <20160204193924.GA8852@debian> <20160205100040.GA4213@debian.eduroam.u-bordeaux.fr> <20160205190236.GA8063@debian> <20160205195449.GA8899@debian> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:44659) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRnJK-0004jB-Ry for guix-devel@gnu.org; Fri, 05 Feb 2016 15:48:59 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aRnJH-0003Mq-LC for guix-devel@gnu.org; Fri, 05 Feb 2016 15:48:58 -0500 Received: from venus.bbbm.mdc-berlin.de ([141.80.25.30]:46273) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aRnJH-0003Kf-AT for guix-devel@gnu.org; Fri, 05 Feb 2016 15:48:55 -0500 In-Reply-To: <20160205195449.GA8899@debian> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org To: Andreas Enge Cc: guix-devel@gnu.org Andreas Enge writes: > On Fri, Feb 05, 2016 at 08:02:36PM +0100, Andreas Enge wrote: >> Okay. I am giving it a try on arm right now. It looks like we should >> then also drop "--with-lapack"; the documentation states that this has= only >> an effect when "--with-blas" is also given: >> https://cran.r-project.org/doc/manuals/r-release/R-admin.html#LAPAC= K >>=20 >> If compilation succeeds on arm now, I will see whether a reference to = lapack >> is retained or not. > > Well, compilation succeeded! We will see whether this will also be the > case on mips. > > And there is still a reference to lapack, so I am not touching the > "--with-lapack" configure flag for now. I would suggest to drop =E2=80=9C--with-lapack=E2=80=9D, too. (I haven=E2= =80=99t found the time to try building without this flag just now.) The manual says: =E2=80=9CHowever, the likely performance gains are thought to be smal= l (and may be negative), and the default is not to search for a suitable LAPACK library, and this is definitely not recommended. [...] Please do bear in mind that using --with-lapack is =E2=80=98definitel= y not recommended=E2=80=99: it is provided only because it is necessary on = some platforms and because some users want to experiment with claimed performance improvements. Reporting problems where it is used unnecessarily will simply irritate the R helpers.=E2=80=9D I don=E2=80=99t remember why I added it in the first place, so I think it= =E2=80=99s best to drop it, considering that the manual tells us only to do it if we know what we want to achieve by adding it. ~~ Ricardo