Re: [Gretl-users] trouble building gretl with custom lapack

On Thu, 18 Aug 2011, Skipper Seabold wrote: > On Thu, Aug 18, 2011 at 7:13 PM, Allin Cottrell <cottrell(a)wfu.edu&gt; wrote: >> On Thu, 18 Aug 2011, Skipper Seabold wrote: >> >>> On Thu, Aug 18, 2011 at 5:32 PM, Allin Cottrell <cottrell(a)wfu.edu&gt; wrote: >>>> On Thu, 18 Aug 2011, Skipper Seabold wrote: >>>> >>>>> Trying to install gretl 1.9.5 from source due to the known seg faults >>>>> in the downstream ubuntu 11.04 repositories. I have all the >>>>> dependencies installed, except my lapack (3.2.2) was built with ATLAS >>>>> (3.9.2) with the same version of gcc I have installed. The lapack >>>>> stuff seems to be giving me troubles, though I'm not too sure why. >>>> >>>> No doubt this should be better documented, but if you want to build >>>> gretl against atlas you should use the LAPACK_LIBS environment >>>> variable. For example: >>>> >>>> LAPACK_LIBS='-L/your/atlas/lib -llapack -lf77blas -lcblas -latlas' \ >>>> ./configure <options> >>>> >>>> You can't just replace -lblas with -lcblas, because more libraries >>>> are needed with an atlas build, including crucially libatlas. >>> >>> Right, I neglected to mention that I also tried to edit configure to link >>> against atlas, cblas, f77blas, etc. to the same effect about the hidden >>> symbol. >>> >>> Are you saying that all I need to do is define LAPACK_LIBS as such and then >>> run configure, or do I still need the with-lapack-prefix as well?? >> >> Just use LAPACK_LIBS; the lapack-prefix thing is only for use where >> you have the standard "-llapack -lblas" linkage, but are using a >> non-standard installation directory. > > That's what I thought. It doesn't look like the LAPACK_LIBS options > are being passed to the compiler, but I haven't gone through the > configure script in great detail. > >>> [...] it fails to build, saying it can't find lblas >> >> "lblas"? Looks like a typo? > > This is why I changed -lblas to -lcblas and tried to add the other > libraries. I have libcblas.*, libf77blas.*, etc. but when I run > configure, it just tries the -llapack -lblas options instead of the > LAPACK_LIBS. I think that either your atlas installation is broken or you're not passing the correct LAPACK_LIBS variable.

I just tried here on Ubuntu 10.04, using the latest stable lapack (3.3.1) plus latest stable atlas (3.8.4), libraries installed into /opt/atlas/lib. In configuring the gretl build I either pass LAPACK_LIBS='-L/opt/atlas/lib -llapack_atl -lf77blas \  -lcblas -latlas' [...] as part of the invocation of gretl's configure script, or else put the relevant variable into the environment via export LAPACK_LIBS='-L/opt/atlas/lib -llapack_atl \  -lf77blas -lcblas -latlas' before invoking ./configure. Either way the gretl build works OK. And 'grep lapack config.log' shows that what I specified for LAPACK_LIBS is being respected. But note: if your atlas libs are built without the correct dependencies being indicated to the linker, you may need to add elements to the LAPACK_LIBS variable, for example -lgfortran and -lgcc_s -- and in that case you may need to add symlinks to your system to define libgfortran.so and libgcc_s.so.