topic Help with linking MKL with VS2010unresolved external symbol in Intel® oneAPI Math Kernel Library

Help with linking MKL with VS2010unresolved external symbol

Yuzhuo_Su — Mon, 19 Jul 2010 17:16:40 GMT

I am having the follwoing example code:

#include "mkl.h"
#include

#define N 5
void main()
{
MKL_INT n = N, inca = 1, incb = 1, i;
MKL_Complex16 a, b, c;
for( i = 0; i < n; i++ ){
a.real = (double)i; a.imag = (double)i * 2.0;
b.real = (double)(n - i); b.imag = (double)i * 2.0;
}
zdotc( &c, &n, a, &inca, b, &incb );
printf( "The complex dot product is: ( %6.2f, %6.2f)\\n", a[1].real, a[1].imag );
system("PAUSE");
}

And I got following error message:

error LNK2019: unresolved external symbol _zdotc referenced in function _main

I think I did Additional dependencies for linkecorrect The following is what I have for this project:

mkl_intel_ilp64.lib
mkl_intel_thread.lib
mkl_core.lib
mkl_solver_ilp64.lib

What else do I

Help with linking MKL with VS2010unresolved external symbol

mecej4 — Mon, 19 Jul 2010 19:04:28 GMT

You are calling a Fortran-77 routine (zdotc) from a mix of C and C++ (#include ). Note that there are C interfaces to the MKL routines, as well.

The dot product is going to be in the variable c, not a[1]. Here is a modified version of zdotex.c:

[cpp]#include 
#include 

#define N 5

int main()
{
    MKL_INT n = N, inca = 1, incb = 1, i;
    MKL_Complex16 a, b, c;
    for( i = 0; i < n; i++ ){
        a.real = (double)i; a.imag = (double)i * 2.0;
        b.real = (double)(n - i); b.imag = (double)i * 2.0;
    }
    zdotc( &c, &n, a, &inca, b, &incb );
    printf( "The complex dot product is: ( %6.2f, %6.2f)n", c.real, c.imag );
}
[/cpp]

Compiling this, linking with the libraries that you listed, and running the .EXE file produced gave me the output

[cpp]The complex dot product is: (140.00, 20.00)[/cpp]

Help with linking MKL with VS2010unresolved external symbol

Gennady_F_Intel — Tue, 20 Jul 2010 08:09:41 GMT

one comment on this topic. We can see that Yuzhuo used ilp64 interfaces. For this case, if you linked with ILP64 MKL libraries you need to add compiler option -DMKL_ILP64 for C-compilation.

We recomend to see more info into mkl's user's guide or into this forum, say here.

--Gennady

Help with linking MKL with VS2010unresolved external symbol

Ying_H_Intel — Mon, 26 Jul 2010 03:26:10 GMT

one more comments :).MSVC 2010 on 64bit Windows support both 32bit and 64bit application development.Ifyou'd like to link MKL ILP64 library,then your MSVC 2010 project configuration is supposed to be "x64", not the default "Win32".
In MSVS 2010* environment,please checkthe optionBuild=>Configuration Manager=> active platform.Select"X64" (if 64bit application).

Here is one genral KBabout MKL usage in VS1020 in Compiling and Linking MKL with Microsoft* Visual C/C++* .
and the on-line KB article Intel Math Kernel Library Link Line Advisorfor your reference,

Regards,
Ying

Help with linking MKL with VS2010unresolved external symbol

Yuzhuo_Su — Thu, 19 Aug 2010 20:47:38 GMT

Sorry for not being replied to this thread any earlier. But THANK you all for your help. And Ying H's suggestion solves my problem.