I agree it would be best. Unfortunately it may not always be possible to do that without heavy hacking. Adding the liblapack link has trade-off, it would make some stuff work out of the box but it could also hide problems on the long term.
Really upstream of any project using blas/lapack needs to have a way to check a user provided configuration before trying a automated detection routine. Looking at you numpy (does the reverse by default without hacking, look at user provided configuration only when its auto detection has failed). François > On 21/10/2016, at 11:08, Volker Braun <vbraun.n...@gmail.com> wrote: > > We do have a pc file so IMHO the best way is to rely on the output of > > $ pkg-config --cflags lapack > -I/mnt/disk/home/release/Sage/local/include > $ pkg-config --libs lapack > -L/mnt/disk/home/release/Sage/local/lib -lopenblas > > > > On Thursday, October 20, 2016 at 11:12:43 PM UTC+2, François wrote: > This is because automatic blas/lapack detection is a hopeless task. > You should pass your lapack libraries to the configuration script. > If you can’t, hack it. > And now that we have switched to openblas, -lopenblas provides lapack. > > François > > > On 21/10/2016, at 10:04, Emmanuel Charpentier <emanuel.c...@gmail.com> > > wrote: > > > > Something just changed in the Sage build process : as of 7.4, LAPACK is no > > longer available to programs running in the Sage shell. > > > > Case in point : I want to install JAGS (an MCMC sampler), which is needed > > by the rjags R package, of some use to Bayesian R users... This package > > compiled fine in the Sage shell up to Sage 7.4beta6. Now, the --configure > > step fails with : > > > > checking for cheev_ in -llapack... no > > checking for cheev_ in -llapack_rs6k... no > > configure: error: "You need to install the LAPACK library" > > > > Indeed : > > > > charpent@asus16-ec:~$ find /usr/local/sage-7/ -iname "*lapack*so*" > > /usr/local/sage-7/local/lib/R/modules/lapack.so > > /usr/local/sage-7/local/lib/python2.7/site-packages/cvxopt/lapack.so > > /usr/local/sage-7/local/lib/python2.7/site-packages/numpy/linalg/lapack_lite.so > > > > /usr/local/sage-7/local/lib/python2.7/site-packages/scipy/linalg/_flapack.so > > > > /usr/local/sage-7/local/lib/python2.7/site-packages/scipy/linalg/cython_lapack.so > > > > charpent@asus16-ec:~$ find /usr/local/sage-7/ -iname "*lapack*h*" > > /usr/local/sage-7/local/lib/R/include/R_ext/Lapack.h > > /usr/local/sage-7/local/include/lapacke_mangling.h > > /usr/local/sage-7/local/include/linbox/algorithms/numeric-solver-lapack.h > > /usr/local/sage-7/local/include/lapacke_config.h > > /usr/local/sage-7/local/include/lapacke.h > > > > > > Short of forcing the Sage build process to use the system's LAPACK (which > > can be done but, as far as I know, is not recommended), I don't see how to > > force the creation of this library and its header file. > > > > Note that could be useful to reduce overhead : R (standard package) creates > > its own version (probably for lack of finding it at build time...) ; it > > also exists in the python package cvxopt. > > > > 1) What do you think ? > > > > 2) Should a ticket be filed ? > > > > HTH, > > > > -- > > Emmanuel Charpentier > > > > -- > > You received this message because you are subscribed to the Google Groups > > "sage-devel" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to sage-devel+...@googlegroups.com. > > To post to this group, send email to sage-...@googlegroups.com. > > Visit this group at https://groups.google.com/group/sage-devel. > > For more options, visit https://groups.google.com/d/optout. > > > -- > You received this message because you are subscribed to the Google Groups > "sage-devel" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to sage-devel+unsubscr...@googlegroups.com. > To post to this group, send email to sage-devel@googlegroups.com. > Visit this group at https://groups.google.com/group/sage-devel. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at https://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
