Re: Undefined reference to `gsl_spmatrix_uchar_norm1'

[Patrick Alken]

For now you can comment out that line. I will log this issue into the 
bug tracker to make a more permanent fix for the next release.

Thanks,

Patrick

On 6/28/21 10:20 AM, Håkon Hægland wrote:
> [[ I am resending this since I forgot to select "Reply all", and 
> bug-gsl@gnu.org <mailto:bug-gsl@gnu.org> was by accident not included 
> in the recepients ]]
> Yes, I agree that seems like a good reason to exclude those functions. 
> Otherwise, I have no strong opinion on whether to include it or not.
>  I am trying to write Perl bindings to the GSL library using swig, see
>
> https://github.com/leto/math--gsl/issues/231 
> <https://github.com/leto/math--gsl/issues/231>
>
> According to the gsl_spmatrix_uchar.h header file (line 175):
>
> https://git.savannah.gnu.org/cgit/gsl.git/tree/spmatrix/gsl_spmatrix_uchar.h#n175 
> <https://git.savannah.gnu.org/cgit/gsl.git/tree/spmatrix/gsl_spmatrix_uchar.h#n175>
>
> there should be a function gsl_spmatrix_uchar_norm1(), so swig gets 
> confused and creates a wrapper for a non-existing function.
>
> Maybe that line 175 could be commented out?
>
> Håkon
>
> On Fri, Jun 25, 2021 at 6:46 PM Patrick Alken <alken@colorado.edu 
> <mailto:alken@colorado.edu>> wrote:
>
>     Hello,
>
>        Unsigned versions of this function were excluded (uchar, uint,
>     ushort), because there is the possibility of adding two large uchar
>     values together during the 1-norm calculation and ending up with a
>     smaller value due to it wrapping back to 0. This didn't make much
>     sense
>     to me when I wrote the function, so I excluded the unsigned versions.
>
>     Do you think it makes sense to have a uchar_norm1 function?
>
>     Patrick
>
>     On 6/25/21 11:45 AM, Håkon Hægland wrote:
>     > I am on Ubuntu 21.04, using GSL 2.7. Here is my test program
>     norm.c :
>     >
>     >
>     > #include <stdio.h>
>     > #include <gsl/gsl_spmatrix.h>
>     > int
>     > main()
>     > {
>     >      gsl_spmatrix_uchar *A = gsl_spmatrix_uchar_alloc(2, 2);
>     >
>     >      gsl_spmatrix_uchar_set(A, 0, 0, 1);
>     >      gsl_spmatrix_uchar_set(A, 0, 1, 2);
>     >      gsl_spmatrix_uchar_set(A, 1, 0, 3);
>     >      gsl_spmatrix_uchar_set(A, 1, 1, 4);
>     >
>     >      double norm = gsl_spmatrix_uchar_norm1(A);
>     >      printf("norm = %g\n", norm);
>     >      gsl_spmatrix_uchar_free(A);
>     >
>     >      return 0;
>     > }
>     >
>     > When I compile this I get an error message from the linker:
>     >
>     > $ gcc -Wall -I/opt/gsl/gsl-2.7/include -c norm.c
>     > $ gcc -L/opt/gsl/gsl-2.7/lib -o norm norm.o -lgsl -lgslcblas -lm
>     > /bin/ld: norm.o: in function `main':
>     > norm.c:(.text+0x93): undefined reference to
>     `gsl_spmatrix_uchar_norm1'
>     > collect2: error: ld returned 1 exit status
>     >
>     > Best regards,
>     > Håkon Hægland