topic Re: MKL Matrix multiplication: undefined reference to `mkl_blas in Intel® oneAPI Math Kernel Library

MKL Matrix multiplication: undefined reference to `mkl_blas_dgemv'

bsukhwani — Mon, 14 Dec 2009 17:43:33 GMT

Hi,

I am trying to link to the MKL library (over a network). I can get MKL FFT to work but while calling a BLAS routine (Matrix Multiplication),
I get the following compile time error:

/mkl/lib/em64t/libmkl_core.a(_def_xdgemm.o): In function `mkl_blas_def_xdgemm':
__tmp_xdgemm.c:(.text+0xb27): undefined reference to `mkl_blas_dgemv'

I am using the example code that came with the MKL. The function call that leads to this error is 'cblas_dgemm'

I am compiling using the following command:

icc -o MatrixMul_MKL cblas_dgemmx.c -L$MKLPATH -I$MKLINCLUDE -W1, --start-group $MKLROOT/lib/em64t/libmkl_intel_lp64.a $MKLROOT/lib/em64t/libmkl_sequential.a $MKLROOT/lib/em64t/libmkl_core.a -W1, --end-group -lpthread

Any help would be greatly appreciated.

-Bharat

Re: MKL Matrix multiplication: undefined reference to `mkl_blas

TimP — Mon, 14 Dec 2009 18:14:03 GMT

Quoting - bsukhwani

icc -o MatrixMul_MKL cblas_dgemmx.c -L$MKLPATH -I$MKLINCLUDE -W1, --start-group $MKLROOT/lib/em64t/libmkl_intel_lp64.a $MKLROOT/lib/em64t/libmkl_sequential.a $MKLROOT/lib/em64t/libmkl_core.a -W1, --end-group -lpthread

You have mis-spelled the -Wl directives.

Re: MKL Matrix multiplication: undefined reference to `mkl_blas

bsukhwani — Mon, 14 Dec 2009 19:30:11 GMT

Quoting - tim18

You have mis-spelled the -Wl directives.

Hi Tim,

Thanks for the reply but that did not fix it. Still the same error.

-Bharat

Re: MKL Matrix multiplication: undefined reference to `mkl_blas

Gennady_F_Intel — Tue, 15 Dec 2009 18:34:25 GMT

Quoting - bsukhwani

Quoting - tim18

You have mis-spelled the -Wl directives.

Hi Tim,

Thanks for the reply but that did not fix it. Still the same error.

-Bharat

then please check your if $MKLROOT provides the proper path to the MKL,
or
please try to build this example by using makefile
see $MKLROOT/examples/cblas/
examples of using:
make lib64 function=cblas_dgemmx+

--Gennady

Re: MKL Matrix multiplication: undefined reference to `mkl_blas

bsukhwani — Tue, 15 Dec 2009 20:49:35 GMT

Quoting - Gennady Fedorov (Intel)

Great! Thanks!!

The $MKLROOT was already providing the proper path to the MKL. Using the makefile did the trick. Now it compiles fine.

This is what I used to make:
make libem64t function=cblas_dgemm

Thanks again,
Bharat