FFTW Library error

Hi;
  I use Visual C++.NET and FFTW library to calculate fft ,when i compile
my program i always have a liker error ,i don't how to solve this
error,may i need to include certain library ?


LINK : fatal error LNK1104: cannot open file 'libm.lib'

I already include fftw3.h at the begining of the program and in the
program's properties  I included these libraries libfftw.lib
libfftw_sse2.lib libfftwf.lib libfftwf_sse.lib as following:

project->properties->Linker->Input->Addetional depenencied 

So how I solve this problem?

I �greatly appocssiate any answer.
Mohsen
		
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This has very little to do with FFTW.  This is a basic C/C++ question.

You are not linking with the standard math library.

Let me get this straight:
1) you already link with "libfftw.lib libfftw_sse2.lib libfftwf.lib 
libfftwf_sse.lib"
2) The linker is complaining about libm.lib

I see a pretty straight-forward solution here.

-- Mark


Mohsen wrote:
> Hi;
>   I use Visual C++.NET and FFTW library to calculate fft ,when i compile
> my program i always have a liker error ,i don't how to solve this
> error,may i need to include certain library ?
> 
> 
> LINK : fatal error LNK1104: cannot open file 'libm.lib'
> 
> I already include fftw3.h at the begining of the program and in the
> program's properties  I included these libraries libfftw.lib
> libfftw_sse2.lib libfftwf.lib libfftwf_sse.lib as following:
> 
> project->properties->Linker->Input->Addetional depenencied 
> 
> So how I solve this problem?
> 
> I �greatly appocssiate any answer.
> Mohsen
> 		
> This message was sent using the Comp.DSP web interface on
> www.DSPRelated.com

Mark Borgerding wrote:

> This has very little to do with FFTW.  This is a basic C/C++ question.
> 
> You are not linking with the standard math library.
> 
> Let me get this straight:
> 1) you already link with "libfftw.lib libfftw_sse2.lib libfftwf.lib 
> libfftwf_sse.lib"
> 2) The linker is complaining about libm.lib
> 
> I see a pretty straight-forward solution here.
> 
> -- Mark
> 
> 
> Mohsen wrote:
> 
>> Hi;
>>   I use Visual C++.NET and FFTW library to calculate fft ,when i compile
>> my program i always have a liker error ,i don't how to solve this
>> error,may i need to include certain library ?
>>
>>
>> LINK : fatal error LNK1104: cannot open file 'libm.lib'
>>
...

libm.lib is the unix C math library, but Visual C++ has never to my knowledge 
used a library of that name. I have VC Studio Express 2005 beta, which is pretty 
much the same as .NET, and there is no libm.lib anywhere. The nearest you get is 
libc.lib (or libcmt.lib for the multi-threaded version), which covers the whole 
of the C library.

Has the  fftw project been imported from some other compiler, such as Intel C++? 
IIRC, that did use libm.lib, and I did get linker errors like that sometimes, 
after I reverted back to Visual C++.

Richard Dobson

Hi,

the solution is to add the lib to your project. The lib has been compiled
for vc++ and can be found at;

http://www.ece.cmu.edu/~franzf/fftw.org/

-aa


		
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