Re: Undefined reference to `gsl_spmatrix_uchar_norm1'

[Håkon Hægland]

[[ I am resending this since I forgot to select "Reply all", and
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

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

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> 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
>