Link errors when using MKL 8.0

[panch]

Hi,

Since upgrading from 7.2 to the new 8.0 I get numerous unresolved externals now:

mkl_ia32.lib(def_dsyrk_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_def_dsyrk
mkl_ia32.lib(def_dtrsm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_def_dtrsm
mkl_ia32.lib(p4_dsyrk_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4_dsyrk
mkl_ia32.lib(p4p_dsyrk_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4p_dsyrk
mkl_ia32.lib(p3_dsyrk_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p3_dsyrk
mkl_ia32.lib(def_dgemm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_def_dgemm
mkl_ia32.lib(p4_dtrsm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4_dtrsm
mkl_ia32.lib(p4p_dtrsm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4p_dtrsm
mkl_ia32.lib(p3_dtrsm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p3_dtrsm
mkl_lapack.lib(dpotrf_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_lapack_dpotrf
mkl_ia32.lib(p4_dgemm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4_dgemm
mkl_ia32.lib(p4p_dgemm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p4p_dgemm
mkl_ia32.lib(p3_dgemm_omp.obj) : error LNK2019: unresolved external symbol ___kmpc_global_thread_num referenced in function _mkl_blas_p3_dgemm
mkl_ia32.lib(def_dsyrk_omp.obj) : error LNK2001: unresolved external symbol _omp_get_max_threads
mkl_ia32.lib(def_dtrsm_omp.obj) : error LNK2001: unresolved external symbol _omp_get_max_threads

...and continues.

If I link with the old mkl72ia32lib libraries, I don't get any errors. Why is that?

I use Visual C++ 7.0.

Regards,

Carsten

[TimP]

The kmp function library is contained in libguide, which comes with MKL.

[panch]

Hi and thanks!

That helped, just wondering why it didn't complain when using Mkl 72 libs.

Regards,

Carsten

[Intel_C_Intel]

There was a change between MKL 7.2 and 8.0, but it was not an arbitrary decision. There were some problems that arose from linking in libguide as a default library. For one thing, a later version of the Intel compiler with an updated version of libguide would not get linked in.

Perhaps I missed it, but I did not see that we documented this change in our release notes. If that is the case, I personally extend an apology for missing that.

[prdorrell]

Hi there,

I'm Paul Dorrell andI'd like to say thanks too!

Yesterday Idownloaded MKL to my Windows XP machine in order tolook at the speed ofsome large FFTs. I triedcompiling an example fromMKL/8.0/examples/dftc inside Visual Studio and got a load oflinking errors similar to thoseyou listed .... and, yes, they went away when I included the libguide.lib in my project.

So you've saved me alot of time ... and restored my faith in user forums!

Kind regardsPaul

[mouna_hammami]

hi everybody, sorry because I have a poor english! well I spent a week trying to work with MKL but.. My problem is: how to link myprogram.c with this library.
I m using Fedora Core et I need the Lapack function zgesvd in my program.c.
please, any help will be welcome! just how to link?any example :(

[zsolt_szekeres]

Hi everybody,

could you please help me with the linking options of MKL?
Here is what I use (just wanted to include everything :-)

ifort myprog.f90 -I/usr/mkl/include/ -L/usr/mkl/lib/32 -lmkl_lapack95 -lmkl_lapack -lmkl_lapack32 -lmkl_lapack64 -lmkl_blas95 -lmkl_ia32 -lmkl_p4 -lguide -lpthread

Versions: ifort 9.0.021 , mkl 8.0.019. Platform: Linux, IA-32.

Now what I see is that the command above works fine when I use the
old f77 interface calls to LAPACK routines, but when I try to use
f95 type calls, it fails to link and gives the following error:

/home/user/tmp/ifortWbnTbN.o: In function `MAIN__':
myfort.f90:(.text+0x54c): undefined reference to `getrf_'

Thanks for your comments in advance

Zsolt

[TimP]

I suspect a problem with the order of your library search. Try moving -lmkl_blas95 ahead of the -lmkl_lapack95.

Minor nit picking:
ifort/icc/icpc option -openmp has the same effect on link as -lguide -lpthread. The latter pair of options is needed by other compilers.
ifort 9.0.028 is much improved over 9.0.021 (the original 9.0 version).

[zsolt_szekeres]

Hi Tim,
thanks for your prompt answer. I tried placing blas95 before
lapack95, but unfortunately it did not help. Substituting
-lguide and -lpthread by -openmp did not help either.
Also I tried to download ifort 9.0.0.28 from the ftp server to see if it makes a difference, but unfortunately only the 9.0.0.21 version is available (at least on the public ftp server).
It would be great if it worked for me: I was really happy to
finally see a simple way of calling simple routines. If you have
any other ideas, please share them. Thanks
Zsolt