Compiling with GSL

[Marcelo]

Hello,

I am having somre problems with the GSL library from GNU. I am trying to do a
HelloWorld example but it doesn't link well.

#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;
}

and the command is
g++ -I/usr/local/include/gsl test.cpp -o test

but it doesn't work at all on Linux.
My GSL headers are in /usr/local/include/gsl and the error is

/tmp/cc4wOtbY.o: In function `main':
test.cpp:(.text+0x36): undefined reference to `gsl_sf_bessel_J0'
collect2: ld returned 1 exit status

Thanks a lot for your help.

Marcelo

[Stephan Brönnimann]

Marcelo wrote:

Hello,

I am having somre problems with the GSL library from GNU. I am trying to do a
HelloWorld example but it doesn't link well.

#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;
}

and the command is
g++ -I/usr/local/include/gsl test.cpp -o test

but it doesn't work at all on Linux.
My GSL headers are in /usr/local/include/gsl and the error is

/tmp/cc4wOtbY.o: In function `main':
test.cpp:(.text+0x36): undefined reference to `gsl_sf_bessel_J0'
collect2: ld returned 1 exit status

You must link with the GSL library, append something like -lgsl
(I don't know the exact library name, check the GSL documentation).

Regards, Stephan

[Kai-Uwe Bux]

Marcelo wrote:

Hello,

I am having somre problems with the GSL library from GNU. I am trying to
do a HelloWorld example but it doesn't link well.

#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;
}

and the command is
g++ -I/usr/local/include/gsl test.cpp -o test

but it doesn't work at all on Linux.
My GSL headers are in /usr/local/include/gsl and the error is

/tmp/cc4wOtbY.o: In function `main':
test.cpp:(.text+0x36): undefined reference to `gsl_sf_bessel_J0'
collect2: ld returned 1 exit status

The compiler finds the headers. But you need to tell the linker to reference
the actual precompiled library. The ways of doing this are platform
specific and off topic in this group. Very likely the documentation for
your compiler and the documentation for GSL contain information about what
you need to do. Since you mentioned Linux, I would guess that there is a
command line option that you forgot.
Best

Kai-Uwe Bux

[Marcelo]

Stephan Brönnimann wrote:

Marcelo wrote:

Hello,

I am having somre problems with the GSL library from GNU. I am trying to do a
HelloWorld example but it doesn't link well.

#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;
}

and the command is
g++ -I/usr/local/include/gsl test.cpp -o test

but it doesn't work at all on Linux.
My GSL headers are in /usr/local/include/gsl and the error is

/tmp/cc4wOtbY.o: In function `main':
test.cpp:(.text+0x36): undefined reference to `gsl_sf_bessel_J0'
collect2: ld returned 1 exit status

You must link with the GSL library, append something like -lgsl
(I don't know the exact library name, check the GSL documentation).

Regards, Stephan

thanks a lot,

i have found my problem with the -lgsl -lgslcblas -lm

MArcelo