Re: Free AMD Core Math Library (BLAS/LAPACK) + Ada

[Simon Wright <simon@pushface.org>]

Ada novice <shai.lesh@gmx.com> writes:

> On Monday, July 16, 2012 10:27:16 AM UTC+1, Simon Wright wrote:
>
>> What you need is the libgfortran.so.3 that lapack was actually linked
>> against. You only need libgfortran.so if you are going to develop in
>> Fortran. I can link against liblapack.so without needing gfortran
>> installed.
>
> libfortran.so.3 then requires the libfortran2 package.

Not here, it doesn't.

   $ ldd /usr/lib/libgfortran.so.3
           linux-vdso.so.1 =>  (0x00007fff8abff000)
           libm.so.6 => /lib/libm.so.6 (0x00007f6e351e5000)
           libc.so.6 => /lib/libc.so.6 (0x00007f6e34e83000)
           /lib64/ld-linux-x86-64.so.2 (0x00007f6e35765000)

>                                                        In step 11 from
> Nasser's page:
> http://12000.org/my_notes/ada/index.htm 
>
> He created a symlink as libgfortran.so is required. So he links
> /usr/lib/i386-linux-gnu/libfortran.so to point to
> /usr/lib/i386-linux-gnu/libgfortran.so.3

I don't know what went wrong with his installation, but here
libgfortran.so is created when you install gfortran(-4.4). And as
Ludovic has said, don't mess with symlinks in system directories.

> What's the difference between the .so and the .so.3 file?

The .so is a symlink which resolves (eventually) to the actual
file. Here, libgfortran.so.3 is a symlink to libgfortran.so.3.0.0.

   $ cd /usr/lib/gcc/x86_64-linux-gnu/4.4.5
   $ ls -l libgfortran.so 
   lrwxrwxrwx 1 root root 25 Jul 16 12:28 libgfortran.so -> ../../../libgfortran.so.3
   $ cd ../../..
   $ ls -l libgfortran.so.3
   lrwxrwxrwx 1 root root 20 Oct 28  2011 libgfortran.so.3 -> libgfortran.so.3.0.0
   $ ls -l libgfortran.so.3.0.0
   -rw-r--r-- 1 root root 964408 Nov 15  2010 libgfortran.so.3.0.0

> But I am thinking to install the gfortran-4.4 package since then I can
> test these programs also:
>
> http://www.nag.com/lapack-ex/lapack-ex.html
>
> where example fortran programs are given as well.
>
> I hope that I do not mess things up. Installing gfortran-4-4 will give
> me libgfortran.so directly and I "will" be able to test example
> fortran programs as well.

Yes.