topic Lapack undefined symbols in Intel® oneAPI Math Kernel Library

Lapack undefined symbols

scriabin3 — Fri, 26 Aug 2011 15:31:47 GMT

Im running ifort 12.0 with command:

ifort -r8 main.f90 -lmkl_core -lmkl_intel_lp64 -lmkl_intel_thread -lmkl_lapack95_lp64

and all is ok with a fortran95 call to the lapack routine gesv. However, if I replace gesv by calls to getrf and getri, it tells me these are "Undefined symbols". Why does it recognise gesv but not getrf or getri?

Lapack undefined symbols

TimP — Fri, 26 Aug 2011 16:06:35 GMT

Do you have the USE mkl95_lapack at the top of the calling subroutine? It should result in getrf and getri being translated to other functions, eventually down to the f77 ?getrf and ?getri which are provided in libmkl_lapack95_lp64. You may need to assure that you have the include path (-I) for the mkl/include/lp64 in your installation.

Lapack undefined symbols

scriabin3 — Fri, 26 Aug 2011 16:35:30 GMT

Oh dear, it's an old code, so I only just noticed it has at the top "use lapack95, only: gesv", how embarrassing... In any case, is there a difference between "use lapack95" and "usemkl95_lapac"?

Lapack undefined symbols

TimP — Fri, 26 Aug 2011 18:26:25 GMT

That's a good point. USE lapack95 and mkl95_lapack should work interchangeably in this case.