Re: [Matlisp-users] matlisp migration trouble (missing symbol)

[rif <rif@MIT.EDU>]

> >>>>> "rif" == rif  <rif@MIT.EDU> writes:
> 
>     rif> Once matlab is loaded, I have a file where I def-fortran-routine
>     rif> dpotrf.  This scheme works fine on my laptop, but on the other
>     rif> machine, when I try to load this file, I get the error:
> 
>     rif> Undefined foreign symbol: "dpotrf_"
>     rif>    [Condition of type KERNEL:SIMPLE-PROGRAM-ERROR]
> 
> This sounds like dpotrf is not in the matlisp LAPACK/BLAS library.
> Are you sure both platforms have identical libraries?  It may happen
> that we don't compile all the LAPACK routines if we don't have a
> matlisp interface to them.
> 
> Ray

OK, my understanding is increasing, but I'm not all the way there yet.
As I now understand, matlisp does not by default load all of lapack,
but only what it needs.  When you specify --with-atlas= at config
time, matlisp loads the atlas lapack library (this is also a subset of
lapack, but it contains the routines I need).  So this explains why my
stuff doesn't work without atlas, on either the laptop or the new
machine.

What I still don't get is why, when I specify a --with-atlas=, it
works on the laptop but not the new machine.  Looking into
lazy-loader.lisp, part of the call to ext::load-foreign includes the
arguments (to be tokenized):

"-L/cbcl/cbcl01/rif/Software/ATLAS/lib/Linux_P4SSE2_4/" " " "-llapack
-lcblas -lf77blas -latlas" " "

This code is clearly being run (if I add some made-up library name I
get an error), so it's finding (and AFAIK loading) the libraries it
wants.  Furthermore, dpotrf_ appears to be in the library:

[rif@node-06 Linux_P4SSE2_4]$ pwd
/cbcl/cbcl01/rif/Software/ATLAS/lib/Linux_P4SSE2_4
[rif@node-06 Linux_P4SSE2_4]$ nm liblapack.a  | grep dpotrf_
00000000 T atl_f77wrap_dpotrf__
         U atl_f77wrap_dpotrf__
00000000 T dpotrf_

Nevertheless, when I try to compile and then load a file containing a
def-foreign-function for dpotrf, it fails on this machine with an
"Undefined symbol dpotrf_ error" (this works on my laptop).  Note that
I seem to be able to just load the .lisp file directly, but compiling
it then loading it yields the undefined symbol error --- I don't know
if this is relevant.

In case anyone wants it, I've put the file matlisp-ext-lapack.lisp in
http://fpn.mit.edu/Downloads.  My goal is to, after loading matlisp,
be able to compile and load this file.

As a side question, is there any easy way to tell what exactly library
files ext::load-foreign is actually picking up?  This could be helpful
for debugging purposes.

Again, any help is appreciated.

Cheers,

rif