Problem compiling MKL with OpenMP

Don_Spong — Thu, 25 Aug 2016 15:57:05 GMT

I'm trying to compile and load a code that uses MKL libraries to solve an eigenvalue problem. I use the following commands based on what the Intel MKL link line advisor tells me:

ifort -c -i8 -qopenmp -I${MKLROOT}/include $OPT dggev_solver.f

ifort -o xgv_omp dggev_solver.o -I. -L${MKLROOT}/lib -Wl,-rpath,${MKLROOT}/lib -lmkl_intel_ilp64 -lmkl_core -lmkl_intel_thread -lpthread -lm -ldl

However, when these are used, there seems to be symbols that are not found (see below):

+ OPT=-O2

+ ifort -c -i8 -qopenmp -I/opt/intel//compilers_and_libraries_2016.3.170/mac/mkl/include -O2 dggev_solver.f

+ ifort -o xgv_omp dggev_solver.o -I. -L/opt/intel//compilers_and_libraries_2016.3.170/mac/mkl/lib -Wl,-rpath,/opt/intel//compilers_and_libraries_2016.3.170/mac/mkl/lib -lmkl_intel_ilp64 -lmkl_core -lmkl_intel_thread -lpthread -lm -ldl

Undefined symbols for architecture x86_64:

"___kmpc_begin", referenced from:

_MAIN__ in dggev_solver.o

"___kmpc_end", referenced from:

_MAIN__ in dggev_solver.o

ld: symbol(s) not found for architecture x86_64

What needs to be added to my compilation lines to fix this?

Thanks, Don

Ifort -qopenmp in the link

TimP — Thu, 25 Aug 2016 21:34:38 GMT

Ifort -qopenmp in the link step would supply -liomp5 -lpthreads as required by Mkl parallel and your use of openmp.

Thanks, that fixed my

Don_Spong — Thu, 25 Aug 2016 21:59:56 GMT

Thanks, that fixed my compilation and loading problem. Also, I had found earlier that just adding -mkl to to the load fixed things.

two my cents wrt "-mkl"

Gennady_F_Intel — Fri, 26 Aug 2016 09:31:34 GMT

two my cents wrt "-mkl" option : with this option, Compiler will link with LP64 ( not ILP64 API you originally pointed.

topic Thanks, that fixed my in Intel® oneAPI Math Kernel Library

Problem compiling MKL with OpenMP

Ifort -qopenmp in the link

Thanks, that fixed my

two my cents wrt "-mkl"