topic linking mkl under linux with fortran 95 blas interface in Intel® oneAPI Math Kernel Library

linking mkl under linux with fortran 95 blas interface

beeboom — Fri, 22 Jan 2010 22:50:55 GMT

Hi everyone,

I am trying to compile test fortran program using blas with fortran 95 interface.

$ cat mkl_test.f90
program dot_main
use mkl95_blas
use mkl95_precision
real x(10), y(10), res
integer i
do i = 1, 10
x(i) = 2.0e0
y(i) = 1.0e0
end do
res = dot(x,y)
print*, 'SDOT = ', res
end

However, I do not succeed and this is the error message I get:

$ ifort mkl_test.f90 -I$FPATH -L$LIBRARY_PATH -L$LD_LIBRARY_PATH -Wl,--start-group /opt/intel/mkl/10.2.3.029/lib/32/libmkl_blas95.a /opt/intel/mkl/10.2.3.029/lib/32/libmkl_intel_thread.a /opt/intel/mkl/10.2.3.029/lib/32/libmkl_core.a -Wl,--end-group -lguide -lpthread
/opt/intel/mkl/10.2.3.029/lib/32/libmkl_blas95.a(sdot.o): In function `sdot_f95_':
../../../../interfaces/blas95/source/sdot.f90:(.text+0x141): undefined reference to `sdot_'

There is similiar thread at this forum where the problem was solved by specifying -lmkl option at compiling. But according to http://software.intel.com/en-us/articles/performance-tools-for-software-developers-for-easily-migrating-from-mkl-9x-to-10x/ and http://software.intel.com/en-us/articles/intel-math-kernel-library-intel-mkl-for-linux-linking-applications-with-intel-mkl-version-100/ since 10th version of mkl libmkl.so was replaced by other libraries. Does somebody know what are the proper options to build this code now?

Thanks!

linking mkl under linux with fortran 95 blas interface

Todd_R_Intel — Sat, 23 Jan 2010 00:51:36 GMT

You have...

the Fortran 95 interface: libmkl_blas95.a
the threading layer: libmkl_intel_thread.a
and the core functionality: libmkl_core.a

But I don't see the interface layer: libmkl_intel.a

-Todd

Link Line Advisor.

linking mkl under linux with fortran 95 blas interface

beeboom — Mon, 25 Jan 2010 18:23:03 GMT

Thanks a lot, I found the solution by examining the makefile given in examples subdirectory.

The proper line should look as follows:

export LD_LIBRARY_PATH="/opt/intel/Compiler/11.1/064/mkl/lib/32":"/opt/intel/Compiler/11.1/064/lib/ia32:/opt/intel/Compiler/11.1/064/mkl/lib/32:/opt/intel/mkl/10.2.3.029/lib/32":"/usr/lib"; ifort -xK -I /opt/intel/Compiler/11.1/064/mkl/include/32 -w mkl_test.f90 /opt/intel/Compiler/11.1/064/mkl/lib/32/libmkl_blas95.a "/opt/intel/Compiler/11.1/064/mkl/lib/32"/libmkl_intel.a -Wl,--start-group "/opt/intel/Compiler/11.1/064/mkl/lib/32"/libmkl_intel_thread.a "/opt/intel/Compiler/11.1/064/mkl/lib/32"/libmkl_core.a -Wl,--end-group -L"/opt/intel/Compiler/11.1/064/mkl/lib/32" -liomp5 -lpthread