unable to compile example program;

unable to compile example program;

[Y. U. Sasidhar]

1. I am trying compile the example program:

=============================================
#include <stdio.h>
#include <gsl/gsl_sf_bessel.h>

int
main (void)
{
  double x = 5.0;

  double y = gsl_sf_bessel_J0 (x);

  printf("J0(%g) = %.18e\n", x, y);

  return 0;
}
=============================================
using 

gcc gsl.c -o gsl 

and getting the error:
-----------------------------------------
undefined reference to `gsl_sf_bessel_J0'
collect2: ld returned 1 exit status
--------------------------------------------

OS redhat 7.1 on PIV
gsl version .7

2. How do I know which header file to include for a
given function and dependencies of the given function
on others.  The manual lists only function description
with return types etc. It does not mention header
files necessary and depedencies.
Sasidhar


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Re: unable to compile example program;

[Ed Hill]

On Wed, 2002-08-14 at 09:31, Y. U. Sasidhar wrote:
> 1. I am trying compile the example program:

[*SNIP*]

> gcc gsl.c -o gsl 
> 
> and getting the error:
> -----------------------------------------
> undefined reference to `gsl_sf_bessel_J0'
> collect2: ld returned 1 exit status
> --------------------------------------------


Hi Sasidhar,

This is a link-time (ld) error, not a header problem.  You need to
provide the libraries containing the code declared in the header(s)
using something like:

  gcc gsl.c -o gsl -lgsl -lgslcblas

which, on my RH 7.3 system, works fine with your example problem:

  [edhill@XXX ~]$ ./gsl 
  J0(5) = -1.775967713143382920e-01
  [edhill@XXX ~]$ 

hth,
Ed

-- 
Edward H. Hill III, PhD 
Post-Doctoral Researcher   |  Email:  ed@eh3.com,  ehill@mines.edu
Division of ESE            |  URLs:   http://www.eh3.com
Colorado School of Mines   |    http://cesep.mines.edu/people/edhill.php
Golden, CO  80401          |  Phone:  303-273-3483    Fax: 303-273-3311

Re: unable to compile example program;

[Fleur Kelpin]

> gcc gsl.c -o gsl

You need to link the gsl library using -lgsl
Check the manual for details.

> 2. How do I know which header file to include for a
> given function and dependencies of the given function
> on others.  The manual lists only function description
> with return types etc. It does not mention header
> files necessary and depedencies.

You could use grep to search the gsl header files for the function you
need. I don't know in which dir RH stores those files, my guess is
/usr/include/gsl

$ grep gsl_sf_bessel_J0 /usr/include/gsl/*
gsl_sf_bessel.h:int gsl_sf_bessel_J0_e(const double x,  gsl_sf_result *
result);
gsl_sf_bessel.h:double gsl_sf_bessel_J0(const double x);

If that does not work on your system, search for the header files and use
that dir.

Re: unable to compile example program;

[Y. U. Sasidhar]

Many thanks for the responses.
Once I installed the recent 1.2 version rpm there was
no problem with compiling ( with -lgsl -lgslcblas ).
I was using .7 version earlier.
Sasidhar


 --- Fleur Kelpin <fleur@bio.vu.nl> wrote: > > gcc
gsl.c -o gsl
> 
> You need to link the gsl library using -lgsl
> Check the manual for details.
> 
> > 2. How do I know which header file to include for
> a
> > given function and dependencies of the given
> function
> > on others.  The manual lists only function
> description
> > with return types etc. It does not mention header
> > files necessary and depedencies.
> 
> You could use grep to search the gsl header files
> for the function you
> need. I don't know in which dir RH stores those
> files, my guess is
> /usr/include/gsl
> 
> $ grep gsl_sf_bessel_J0 /usr/include/gsl/*
> gsl_sf_bessel.h:int gsl_sf_bessel_J0_e(const double
> x,  gsl_sf_result *
> result);
> gsl_sf_bessel.h:double gsl_sf_bessel_J0(const double
> x);
> 
> If that does not work on your system, search for the
> header files and use
> that dir.
>  

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Re: unable to compile example program;

[Brian Gough]

Y. U. Sasidhar writes:
 > 2. How do I know which header file to include for a
 > given function and dependencies of the given function
 > on others.  The manual lists only function description
 > with return types etc. It does not mention header
 > files necessary and depedencies.

The header files are given at the beginning of the section
where the function is described.