Linking Intel's MKL (BLAS & LAPACK) to GCC

Question

I am trying to compile a giant software package, and this is the last hurdle I can't seem to figure out.

I'm getting errors like:

RNDiracDeterminantBase.cpp:(.text+0x22bf): undefined reference to `dgetrf_'
RNDiracDeterminantBase.cpp:(.text+0x2524): undefined reference to `dgetri_'
RNDiracDeterminantBase.cpp:(.text+0x3005): undefined reference to `dgetri_'
../../lib/libqmcwfs.a(RNDiracDeterminantBase.cpp.o): In function `qmcplusplus::RNDiracDeterminantBase::ratio(qmcplusplus::ParticleSet&, int, qmcplusplus::ParticleAttrib<qmcplusplus::TinyVector<double, 3u> >&, qmcplusplus::ParticleAttrib<double>&)':
RNDiracDeterminantBase.cpp:(.text+0x4156): undefined reference to `dgemv_'
RNDiracDeterminantBase.cpp:(.text+0x420f): undefined reference to `dger_'

Google reveals that these references are to Intel's MKL library. However, I don't know what file I need to link. I've tried libmkl_core.a, libmkl_gnu_thread.a, libmkl_blacs_intelmpi_lp64.a, etc. There's tons of files in:

/mkl/lib/intel64/

Can post more information if requested.

Answer 1

I don't know what file I need to link. I've tried libmkl_core.a, libmkl_gnu_thread.a, libmkl_blacs_intelmpi_lp64.a, etc. There's tons of files in: /mkl/lib/intel64/

The fact that there are tons of files doesn't mean you have to try each library in turn.

To find out which library defines the symbols you want, run this command:

cd /mkl/lib/intel64
nm -A *.a | egrep '[TWBD] (dger_|dgemv_|dgetrf_|dgetri_)$'

Also be sure to put libraries at the end of your link line, as the order of archive libraries on command line matters.