topic I also used in Intel® oneAPI Math Kernel Library

use gfortran to link mkl libraries

Yu__Wenbin — Wed, 06 May 2015 13:22:57 GMT

I am writing to ask help for linking mkl with a fortran code on a Surface Pro with win 8.1 OS. I am using gfortran 4.9.2 (TDM-GCC-65). The Fortran code is paralleled using OpenMP.

I am using the following command:

gfortran -fopenmp -o mycode *.o mkl_rt.lib libiomp5md.lib

It links ok. But during execution, the executable crashes and reports Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

I also tried the following

gfortran -fopenmp -o mycode *.o mkl_rt.lib libiomp5md.lib

I got the following linking error:

Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
mkl_intel_thread.lib(mkl_threading.obj):(.text[MKL_get_N_Cores]+0x12): undefined reference to `__chkstk'
mkl_core.lib(_p4n_xdsyrk.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_def_xdsyrk.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_avx_dsyrk_pst.obj):../../../../blas/k:(.text+0x10): undefined reference to `__chkstk'
mkl_core.lib(_mc3_dsyrk_pst.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_mc_dsyrk_pst.obj):../../../../blas/k:(.text+0x12): more undefined references to `__chkstk' follow

I also used

Yu__Wenbin — Wed, 06 May 2015 13:36:28 GMT

I also used

gfortran -fopenmp -o mycode *.o mkl_rt.lib

It links ok. But during execution, the executable crashes and reports Program received signal SIGSEGV: Segmentation fault - invalid memory reference.

libgomp would not support mkl

TimP — Wed, 06 May 2015 15:29:00 GMT

libgomp would not support mkl parallel. You may be able to use mkl sequential, or if you build without fopenmp, use libiomp5.

a common reason for segfault could be stack overflow which might be fixed by appending a /link /stack setting.

Dear Tim,

Yu__Wenbin — Wed, 06 May 2015 15:50:48 GMT

Dear Tim,

Thanks a lot for your suggestion. Can you be more specific? I need the code to be parallel for performance, my whole purpose to turn to MKL libraries. There is a typo in the original post about the second option I tried is

gfortran -fopenmp -o mycode *.o mkl_intel_lp64.lib mkl_intel_thread.lib mkl_core.lib libiomp5md.lib

The error message is

in principle, if you set

TimP — Wed, 06 May 2015 20:21:00 GMT

in principle, if you set fopenmp, you must not use libiomp or mkl parallel on Windows due to incompatible openMP support.

If sufficient parallelism can be found outside the MKL function call, it can be more effective to call MKL serial functions from a parallel region, and this could get around the problem with various OpenMP internal conventions.

As MKL isn't marketed separately from Intel compilers,and builds under Visual Studio are seen as the primary Windows market, Intel may not see sufficient reason to try to improve compatiblity with the various Windows gfortran variants. gfortran compatibility centers primarily on the versions supported by specific linux distros.

If you could build the open source OpenMP library with compatible mingw compilers, that might do the job, but when I tried it seemed to require the full Visual Studio when building on Windows.

Tim,

Yu__Wenbin — Thu, 07 May 2015 01:37:43 GMT

Tim,

Thanks a lot for your expert opinion! What are the libraries needed for MKL serial functions?

Hi Wenbin

Ying_H_Intel — Thu, 07 May 2015 03:54:35 GMT

Hi Wenbin

The serial link line is like

gfortran -fopenmp -o mycode *.o mkl_intel_lp64.lib mkl_sequential.lib mkl_core.lib

Agree with Tim, there is two issues here.

1. under windows, MKL only support libiomp5 or pgi openmp Run time library, no including gfortran openmp.

2. if under Linux, mkl can support gfortran openmp. The link line is like https://software.intel.com/en-us/articles/intel-mkl-link-line-advisor

-Wl,--start-group ${MKLROOT}/lib/intel64/libmkl_gf_lp64.a ${MKLROOT}/lib/intel64/libmkl_core.a ${MKLROOT}/lib/intel64/libmkl_gnu_thread.a -Wl,--end-group -ldl -lpthread -lm

export MKL_INTERFACE_LAYER=gnu

export MKL_THREADING_LAYE= gun

-Wl,--no-as-needed -L${MKLROOT}/lib/intel64 -lmkl_rt -lpthread -lm

unlucky, no of them are applicable for your case, so if you have enough openmp parallel work, you may use sequential MKL , or call sequential MKL in OpenMP region.

Best Regard,

Ying

Dear Ying, Thanks alot for

Yu__Wenbin — Thu, 07 May 2015 14:52:42 GMT

Dear Ying, Thanks alot for your advice.

I used gfortran -fopenmp -o mycode *.o mkl_intel_lp64.lib mkl_sequential.lib mkl_core.lib.

However, during linking, I am still getting similar error message:

Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
Warning: .drectve `-defaultlib:"uuid.lib" ' unrecognized
Warning: corrupt .drectve at end of def file
mkl_core.lib(_p4n_xdsyrk.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_def_xdsyrk.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_avx_xdgemv.obj):../../../../blas/k:(.text+0x10): undefined reference to `__chkstk'
mkl_core.lib(_mc3_xdgemv.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_mc_xdgemv.obj):../../../../blas/k:(.text+0x12): undefined reference to `__chkstk'
mkl_core.lib(_p4n_xdgemv.obj):../../../../blas/k:(.text+0x12): more undefined references to `__chkstk' follow

You might note that chkstk

TimP — Thu, 07 May 2015 15:33:43 GMT

You might note that chkstk.obj should be available for borrowing from a visual studio site, and there are many web references about attempts to satisfy __chkstk in mingw, some involving people more expert on the topic than anyone here.

Do you have the same problem if you try to link against the _dll.lib (dynamic library versions) of MKL?

Did you try stuff like -Wl,"-nostdlib uuid.lib" if you want to suppress those warnings?

I copied a chkstk.obj into

Yu__Wenbin — Thu, 07 May 2015 16:40:37 GMT

I copied a chkstk.obj into the folder. But now I got the following complain. What is wrong?

C:/TDM-GCC-64/bin/../lib/gcc/x86_64-w64-mingw32/4.9.2/../../../../x86_64-w64-mingw32/bin/ld.exe: i386 architecture of input file `chkstk.obj' is
incompatible with i386:x86-64 output

You would need a chkstk.obj

TimP — Thu, 07 May 2015 17:37:38 GMT

You would need a chkstk.obj built for X64, including amd64 machine tag. The references I saw indicated this method works in some but not all cases.

Hi Wenbin,

Ying_H_Intel — Tue, 12 May 2015 03:12:43 GMT

Hi Wenbin,

Any news?

Or try 32bit directly, > gfortran -fopenmp -o mycode *.o mkl_intel_c.lib mkl_sequential.lib mkl_core.lib.

Another possibility, as you know, Intel MKL are part of Intel Fotran Composer Suite for windows. If with intel MKL, you may work with ifort + MKL on Windows OS directly. Intel fotran compiler support OpenMP definitely.

Best Regards,

Ying