Re: [Help-gsl] Linking error using fft complex radix2 forward

[John Provis]

James,

I am one of the previous users who's has (seemingly unending) trouble
linking to GSL in MSVC++. Eventually, I've figured out a way to get
around most of the problems - do you have the "Demo" workspace
and project files (demo.dsp and demo.dsw) from the GSL installation?
Rather than starting a new project from scratch, copy these files to the
folder you want your new project in, and edit the dependencies to include
your new source code file - the project and workspace files should
already have the required settings that will let it link properly, rather
than having to set everything up yourself every time you want to start a
new project. You may also have to copy a couple of the .dll files into
your project directory - it'll probably give you a runtime error the
first time you try to run the program telling you which ones you
need.

Have fun...

John.



At 15:58 22/12/2003, you wrote:
> Dear
> Sir/Madam,
>  
> I tried to build a simple example that i
> obtained from the GNU scientific library
> website(http://www.gnu.org/software/gsl/manual/gsl-ref_15.html#SEC239),
> using visual c++ (winconsole application). but i encountered a linking
> error:
>  
> fft1.obj: error lnk2001: unresolved external
> symbol _gsl_fft_complex_radix2_forward
> Debug/fft.exe: fatal error lnk1120: 1 unresolved externals
> Error executing link.exe.
>  
> The program code that i have used is shown
> below:
> //---------------------------------------------------------------------------------
>
> #include <stdio.h>
> #include <math.h>
> #include <gsl/gsl_errno.h>
> #include <gsl/gsl_fft_complex.h>
>
> #define REAL(z,i) ((z)[2*(i)])
> #define IMAG(z,i) ((z)[2*(i)+1])
>
> int
> Pascal WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR
> IpszCmdLine,int nCmdShow)
> {
>   int i;
>   double data[2*128];
>
>   for (i = 0; i < 128; i++)
>     {
>        REAL(data,i) = 0.0;
>        IMAG(data,i) = 0.0;
>     }
>
>   REAL(data,0) = 1.0;
>
>   for (i = 1; i <= 10; i++)
>     {
>        REAL(data,i) = REAL(data,128-i) =
> 1.0;
>     }
>
>   for (i = 0; i < 128; i++)
>     {
>       printf ("%d %e %e\n", i, 
>              
> REAL(data,i), IMAG(data,i));
>     }
>   printf ("\n");
>
>   gsl_fft_complex_radix2_forward (data, 1, 128);
>
>   for (i = 0; i < 128; i++)
>     {
>       printf ("%d %e %e\n", i, 
>              
> REAL(data,i)/sqrt(128), 
>              
> IMAG(data,i)/sqrt(128));
>     }
>
>   return 0;
> }
> //---------------------------------------------------------------------------------
> Following
> advices from other people who encountered linking errors in
> gsl(http://sources.redhat.com/ml/gsl-discuss/2003-q2/msg00281.html),
> i added a /MD at the end of the list of settings in the
> Project-settings-c/c++ window, to no avail.
>  
> DO you have any idea how i could resolve this
> linking error? Please advise.
>  
> With thanks,
> James
>  
>  
>  
> _______________________________________________
> Help-gsl mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/help-gsl

___________________________________________________________
John Provis                                            address@hidden
Geopolymer and Minerals Processing Group
Department of Chemical and Biomolecular Engineering
University of Melbourne                           Tel. +61 3 8344 8755
Victoria 3010                                            Mob. +61 402 596 209
AUSTRALIA