fftw3xf_intel conflicts with other libs

[Damien_Desmidts]

Hi,
I'm trying to build a Fortran program which uses the FFTW routines from MKL. I'm under Windows XP32, Visual Studio 2008, Intel Fortran Compiler 11.1�51.

I created a solution similar to the one sent by attachment (fftw_problem.zip) by Gennady Fedorov (Intel) in his reply to the following thread :


http://software.intel.com/en-us/forums/showthread.php?t=65448,

Since his solution is made for a 64-bit architecture, I adapted the solution for an IA-32 platform by following the steps summarized below:


1) The same Fortran file is used




implicit none
!include "fftw3.f"
INCLUDE 'fftw3.f'
INCLUDE 'mkl_fftw_examples.fi'

!!
!!
!!

integer n
parameter (n=16)

integer*8 plan, iplan

double complex in, out
dimension in(N), out(N)

integer i


print *,"n = ",n
print *,"input = "
do i=1,n
in(i) = (1.0, 0.0)
print *,in(i)
enddo

print *,"fftw_fwd = ",fftw_forward
print *,"fftw_bkwd = ",fftw_backward
print *,"fftw_estimate = ",fftw_estimate

!call dfftw_plan_dft_1d(plan, n,in,out,fftw_forward, FFTW_ESTIMATE)
call DFFTW_PLAN_DFT_1D(plan, n,in,out,fftw_forward, FFTW_ESTIMATE)
call dfftw_plan_dft_1d(iplan,n,out,in,fftw_backward,FFTW_ESTIMATE)

print *,"address of fwd plan = ",plan
print *,"address of bckwd plan = ",iplan

call dfftw_execute(plan)

print *, 'output after forward fft:'
do i=1,n
print *, out(i)
enddo

call dfftw_execute(iplan)

print *, 'after inverse fft:'
do i=1,n
print *, in(i)
enddo

call dfftw_destroy_plan(plan)
call dfftw_destroy_plan(iplan)

end


















2) I created the fftw3xf_intel.lib with the command nmake lib32
3) I created the project in VS2008 with the main Fortran file and the file mkl_fftw_examples.fi
4) I added the following paths in the tab

Fortran -> General -> Additional Include Directories : C:ProgramFilesIntelCompiler11.1�51mklinclude;C:ProgramFilesIntelCompiler11.1�51mklincludefftw;C: ProgramFilesIntelCompiler11.1�51libia32


5) I added the path of the fftw3xf_intel.lib in the tab

Linker -> General -> Additional Library Directories : C:ProgramFilesIntelCompiler11.1�51mklia32lib


5) I added fftw3xf_intel.lib in the tab

Linker -> Input -> Additional Dependencies


When I try to build i get the following errors:


------ Build started: Project: fftw3_windows, Configuration: Debug Win32 ------
Linking...
LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiCreateDescriptor_d_md referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiCreateDescriptor_d_1d referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiErrorClass referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiSetValue referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _MKL_Domain_Get_Max_Threads referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _MKL_Domain_Set_Num_Threads referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiCommitDescriptor referenced in function _fftw_plan_guru64_dft
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiComputeForward referenced in function _execute_fi
fftw3xf_intel.lib(fftw_plan_guru64_dft.obj) : error LNK2019: unresolved external symbol _DftiComputeBackward referenced in function _execute_bi
fftw3xf_intel.lib(fftw_version.obj) : error LNK2019: unresolved external symbol _DftiFreeDescriptor referenced in function _delete_plan
fftw3xf_intel.lib(fftw_malloc.obj) : error LNK2019: unresolved external symbol _MKL_malloc referenced in function _fftw_malloc
fftw3xf_intel.lib(fftw_free.obj) : error LNK2019: unresolved external symbol _MKL_free referenced in function _fftw_free
Debugfftw3_windows.exe : fatal error LNK1120: 12 unresolved externals

Build log written to "file://C:Intel_fftw3fftw3_windowsDebugBuildLog.htm"
fftw3_windows - 13 error(s), 1 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========





Could someone please help me? I already thank you very much fo your kind support.


Damien

[Vladimir_Petrov__Int]

Damien,

I think you just need more libraries in step 5 (the second step 5 :)). To verify if this is the case, please try adding the following set of libraries there:
mkl_intel_c.lib
mkl_sequential.lib
mkl_core.lib

Please note that this will give you the sequential performance.
In general, to find out which libraries are required, please refer to our link line advisor:
http://software.intel.com/en-us/articles/intel-mkl-link-line-advisor/

Best regards,
-Vladimir

[Damien_Desmidts]

Quoting - Vladimir Petrov (Intel)

Damien,

I think you just need more libraries in step 5 (the second step 5 :)). To verify if this is the case, please try adding the following set of libraries there:
mkl_intel_c.lib
mkl_sequential.lib
mkl_core.lib

Please note that this will give you the sequential performance.
In general, to find out which libraries are required, please refer to our link line advisor:
http://software.intel.com/en-us/articles/intel-mkl-link-line-advisor/

Best regards,
-Vladimir

Dear Vladimir,

Thanks a lot for your support; now it builds perfectly!

I tried to use the same project but without using MKL libraries and rather using import libraries created from precompiled DLL's on FFTW's site by means of the

lib /def:libfftw3-3.def
lib /def:libfftw3f-3.def
lib /def:libfftw3l-3.def

commands.

However Intel Fortran fails to link it correctly and sends the following message :


------ Build started: Project: fftw, Configuration: Debug Win32 ------
Linking...
fftw3_test.obj : error LNK2019: unresolved external symbol _DFFTW_PLAN_DFT_1D referenced in function _MAIN__
fftw3_test.obj : error LNK2019: unresolved external symbol _DFFTW_EXECUTE referenced in function _MAIN__
fftw3_test.obj : error LNK2019: unresolved external symbol _DFFTW_DESTROY_PLAN referenced in function _MAIN__
Debugfftw.exe : fatal error LNK1120: 3 unresolved externals

Build log written to "file://C:fortranfftw3_VS2008fftw_fortranfftwfftwDebugBuildLog.htm"
fftw - 4 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========






The same build error hapens if I use instead the libfftw.lib and fft3w.h generated when building fftw3 for VS2008 by means of Project Files downloaded from http://www.fftw.org/install/windows.html.



I guess some libraries are missing but which one should I add if I don't use the additional mkl_*.lib's from above? I don't think the precompiled DLL's or the libraries built with theProject Files from FFTW's webpage require the C++ Intel libraries or C++ Intel environment.


Do you have any idea about the missing stuff?


Thanks in advance,


Damien

[Dmitry_B_Intel]

Hi Damien,

It would be helpful if you posted the link line that produced the linker errors you mentioned, even though it is not related to MKL. Looks like fftw3-f.lib (or whatever the import library name is) is missing from the link line.

By the way, in the release of MKL you use the library mkl_intel_c.libshould contain fftw3 Fortran wrappers (the symbols like _DFFTW_PLAN_DFT_1D), so that you don't need to build fftw3xf_intel.lib.

Dima