Using LAPACK64 on new CentOS 7 system (Red Hat Enterprise Linux 7)

[Erricos C. Pavlis]

Hi,

I have been using LAPACK on our Linux cluster for years now without any problems. I compile our main s/w package with GNU’s gfortran and link as follows:

gfortran -o ge1507p6_i64.x cgmass_module.o ge1507p6_i64.o mssgfc_mod.o -llapack

We are in the process of changing to a new server that runs CentOS 7 and I am told that the new system has LAPACK, LAPACK64, etc. which I need to link to, all of them under /usr/lib64:

/usr/lib64 854 > ll liblapack*

lrwxrwxrwx 1 root root      20 Feb 20 11:29 liblapack64.so.3 -> liblapack64.so.3.4.2

lrwxrwxrwx 1 root root      20 Feb 20 11:29 liblapack64.so.3.4 -> liblapack64.so.3.4.2

-rwxr-xr-x 1 root root 5634192 Aug  2  2017 liblapack64.so.3.4.2

lrwxrwxrwx 1 root root      19 Jan 10 13:14 liblapacke.so.3 -> liblapacke.so.3.4.2

lrwxrwxrwx 1 root root      19 Jan 10 13:14 liblapacke.so.3.4 -> liblapacke.so.3.4.2

-rwxr-xr-x 1 root root 1965960 Aug  2  2017 liblapacke.so.3.4.2

lrwxrwxrwx 1 root root      18 Jan 10 13:14 liblapack.so.3 -> liblapack.so.3.4.2

lrwxrwxrwx 1 root root      18 Jan 10 13:14 liblapack.so.3.4 -> liblapack.so.3.4.2

-rwxr-xr-x 1 root root 5638352 Aug  2  2017 liblapack.so.3.4.2

I am also told by the folks that administer this system that I need to set an environmental variable in my .profile file as follows in order that the loader can find these files:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib64

When I do all this and try to compile our s/w I keep getting an error:

 gfortran -o ge1802p1_i64.x -L/usr/lib64 -lliblapack64 cgmass_module.o MSSGFC_MOD.o 

/usr/bin/ld: cannot find -lliblapack64

collect2: error: ld returned 1 exit status

What is happening here? When I visit  /usr/lib64    I see that the files exist, with the library path defined, why can’t they be found?

Thanks for any hints, I tried to find similar problems reported online but it seems there have not been any so far…

ecp

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  Dr. Erricos C. Pavlis                            Phone:+1 (410)-455-5832

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[Julie Langou]

Dear Erricos
 Try -llapack64

gfortran -o ge1802p1_i64.x -L/usr/lib64 -llapack64 cgmass_module.o MSSGFC_MOD.o 

Hope it helps

Julie

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[Erricos C. Pavlis]

Thank you Julie, it turns out it was a problem with an incorrect installation of your libraries on our system! All is well now, thanks for replying though!

ecp