Linking error in MSVC 6.0

Linking error in MSVC 6.0

[Trond Mathias Døskeland]

This code I compile with GCC without any errors. When I use MSVC I get
18 errors. This although I have added ligsl.lib and libgslcblas.lib to
the list of libraries and compiled the DLLs with /MD.

Errors:
Compiling...
oppg51dny.cpp
c:\program files\gsl\include\gsl\gsl_precision.h(56) : error C2201:
'gsl_prec_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(56) : error C2734:
'gsl_prec_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(56) : error C2133:
'gsl_prec_eps' : unknown size
c:\program files\gsl\include\gsl\gsl_precision.h(57) : error C2201:
'gsl_prec_sqrt_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(57) : error C2734:
'gsl_prec_sqrt_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(57) : error C2133:
'gsl_prec_sqrt_eps' : unknown size
c:\program files\gsl\include\gsl\gsl_precision.h(58) : error C2201:
'gsl_prec_root3_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(58) : error C2734:
'gsl_prec_root3_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(58) : error C2133:
'gsl_prec_root3_eps' : unknown size
c:\program files\gsl\include\gsl\gsl_precision.h(59) : error C2201:
'gsl_prec_root4_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(59) : error C2734:
'gsl_prec_root4_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(59) : error C2133:
'gsl_prec_root4_eps' : unknown size
c:\program files\gsl\include\gsl\gsl_precision.h(60) : error C2201:
'gsl_prec_root5_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(60) : error C2734:
'gsl_prec_root5_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(60) : error C2133:
'gsl_prec_root5_eps' : unknown size
c:\program files\gsl\include\gsl\gsl_precision.h(61) : error C2201:
'gsl_prec_root6_eps' : must have external linkage in order to be
exported/imported
c:\program files\gsl\include\gsl\gsl_precision.h(61) : error C2734:
'gsl_prec_root6_eps' : const object must be initialized if not extern
c:\program files\gsl\include\gsl\gsl_precision.h(61) : error C2133:
'gsl_prec_root6_eps' : unknown size
Error executing cl.exe.

oppg51dny.exe - 18 error(s), 0 warning(s)

Code:
#include <iostream>
#include <stdio.h>
#include <math.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_roots.h>

using namespace std;

struct my_f_params {double a, b, c; };
double my_f (double x, void *params);
double my_f_deriv (double x, void *params);
void my_f_fdf (double x, void *params, double *y,  double *dy);
int fdfsolver(gsl_root_fdfsolver* s);

int main (void)
{
  double x_lo = -2.0, x_hi = 2.0, x = -1.0;

  struct my_f_params params = { 0.0 , 0.0, 0.0};

//define functions

gsl_function_fdf Ffdf;



Ffdf.f = &my_f;
Ffdf.df = &my_f_deriv;
Ffdf.fdf = &my_f_fdf;
Ffdf.params = &params;

//define solver types

const gsl_root_fdfsolver_type **Tfdf;

const gsl_root_fdfsolver_type *fdfsolvertypes[4];

fdfsolvertypes[0] = gsl_root_fdfsolver_newton;
fdfsolvertypes[1] = gsl_root_fdfsolver_secant;
fdfsolvertypes[2] = gsl_root_fdfsolver_steffenson;
fdfsolvertypes[3] = 0;
Tfdf = fdfsolvertypes;

//define solver

gsl_root_fdfsolver *sfdf;

// FDFSOLVER

 while (*Tfdf !=0) {
  sfdf = gsl_root_fdfsolver_alloc (*Tfdf);
  gsl_root_fdfsolver_set (sfdf, &Ffdf, x);
 if (fdfsolver(sfdf))
  cout << "Error" << endl;
 Tfdf = Tfdf + 1;
 }
return 0;
};

int fdfsolver(gsl_root_fdfsolver* s) {
 int status, iter = 0, max_iter = 100;
 double x=2, x0;
 double epsabs=0.01, epsrel=0.001;

 do {
  iter++;
  status = gsl_root_fdfsolver_iterate (s);
  x0 = x;
  x = gsl_root_fdfsolver_root (s);

  status = gsl_root_test_delta (x, x0, epsabs, epsrel);

  if(status == GSL_SUCCESS) {

  printf ("Converges:\n");
  printf("using %s method\n", gsl_root_fdfsolver_name (s));
  printf("%5s %10.7f  \n", "iter", "x");
 };
  printf ("%5d %10.7f \n", iter, x);
 }
 while (status == GSL_CONTINUE && iter <max_iter);
 return status;
 };


 double my_f (double x, void * params)
{
   struct my_f_params *p = (struct my_f_params *)params;

   double a = p->a;
   double b = p->b;
   double c = p->c;

   return sin(2*M_PI*x)-2*x;
}

double my_f_deriv (double x, void * params)
{
   struct my_f_params *p = (struct my_f_params *)params;

   double a = p->a;
   double b = p->b;
   double c = p->c;
   return cos(2*M_PI*x)*2*M_PI-2;
}

void my_f_fdf (double x, void * params,  double * y, double * dy)
{
 struct my_f_params *p = (struct my_f_params *)params;

   double a = p->a;
   double b = p->b;
   double c = p->c;


   *dy = cos(2*M_PI*x)*2*M_PI-2;
   *y = sin(2*M_PI*x)-2*x;
}

Trond Døskeland

Re: Linking error in MSVC 6.0

[Brian Gough]

Trond Mathias Døskeland writes:
 > This code I compile with GCC without any errors. When I use MSVC I get
 > 18 errors. This although I have added ligsl.lib and libgslcblas.lib to
 > the list of libraries and compiled the DLLs with /MD.
 > 

I could not reproduce the problem.  

I created an empty "Win32 Console Application" using the new project
wizard and added the code as test.cpp. I set the runtime library to
"Multithreaded DLL" and put libgsl.lib, libgslcblas.lib in the link
library modules option. It compiled and ran.

Brian

Linking error problem related to #includes

[Gaurav Bansal]

Hello

I have a program that uses gnu-gsl eigen value library.
Here is the file structure.

WORKING DIRECTORY CONSIST OF
*******************************
gsl - sub folder
deletethis.cpp (driver)
makefile
matrix.cpp
-----
-----
*******************************

gsl SUB DIRECTORY CONSISTS OF (3rd party library)
*******************************
gsl_block.h
gsl_block_complex_long_double.h
gsl_eigen.h
---
---
----
*******************************

deletethis.cpp (driver)
**************************
// deletethis.cpp : Defines the entry point for the console
application.
#include <gsl_eigen.h>  // third party library file
#include "matrix.h"    // file that i created
int main(int argc, char* argv[]){
---
--
}
***************************

gsl_eigen.h
**********************
#include <gsl_vector.h> //internally 3rd party library includes its
header files as <>
#include <gsl_matrix.h>
----
----
************************


Makefile I am using is
***********************
VPATH = gsl
objects = deletethis.o matrix.o vector_ops.o utility.o symm.o qrstep.o
deletethis : $(objects)
 g++ -Igsl $(objects) -o deletethis
deletethis.o: deletethis.cpp
 g++ -Igsl -o deletethis.o -c deletethis.cpp
utility.o : utility.cpp
 g++ -Igsl -o utility.o -c utility.cpp
vector_ops.o : vector_ops.cpp vector_ops.h
 g++ -Igsl -o vector_ops.o -c vector_ops.cpp
matrix.o : matrix.cpp matrix.h vector_ops.h
 g++ -Igsl -o matrix.o -c matrix.cpp
symm.o : symm.c qrstep.o gsl_math.h gsl_vector.h gsl_matrix.h
gsl_linalg.h gsl_eigen.h
 g++ -Igsl -o symm.o -c symm.c
qrstep.o : qrstep.c
 g++ -Igsl -o qrstep.o -c qrstep.c

************************

I am using I switch to make sure gsl sub folder is searched for header
files.
If i try to compile this program, i can get object files created but
there is problem with linking. Here is the output

*************************
$ make
g++ -Igsl -o deletethis.o -c deletethis.cpp
g++ -Igsl -o matrix.o -c matrix.cpp
g++ -Igsl -o vector_ops.o -c vector_ops.cpp
g++ -Igsl -o utility.o -c utility.cpp
g++ -Igsl -o qrstep.o -c qrstep.c
g++ -Igsl -o symm.o -c symm.c
g++ -Igsl deletethis.o matrix.o vector_ops.o utility.o symm.o qrstep.o
-o delete
this
deletethis.o(.text+0x17d):deletethis.cpp: undefined reference to
`_gsl_matrix_vi
ew_array'
deletethis.o(.text+0x18c):deletethis.cpp: undefined reference to
`_gsl_vector_al
loc'
deletethis.o(.text+0x21a):deletethis.cpp: undefined reference to
`_gsl_vector_ge
t'
symm.o(.text+0x5b7):symm.c: undefined reference to `_gsl_error'
symm.o(.text+0x5fc):symm.c: undefined reference to `_gsl_error'
symm.o(.text+0x649):symm.c: undefined reference to `_gsl_error'
symm.o(.text+0x693):symm.c: undefined reference to `_gsl_error'
symm.o(.text+0x7a0):symm.c: undefined reference to `_gsl_error'
symm.o(.text+0x7df):symm.c: more undefined references to `_gsl_error'
follow
symm.o(.text+0x875):symm.c: undefined reference to
`_gsl_vector_view_array'
symm.o(.text+0x892):symm.c: undefined reference to
`_gsl_vector_view_array'
symm.o(.text+0x8b2):symm.c: undefined reference to
`_gsl_vector_view_array'
symm.o(.text+0x8ca):symm.c: undefined reference to
`_gsl_linalg_symmtd_decomp'
symm.o(.text+0x8e3):symm.c: undefined reference to
`_gsl_linalg_symmtd_unpack_T'

symm.o(.text+0xa05):symm.c: undefined reference to
`_gsl_vector_view_array'
symm.o(.text+0xa1d):symm.c: undefined reference to
`_gsl_vector_memcpy'
symm.o(.text$gsl_vector_set+0x3d):symm.c: undefined reference to
`_gsl_error'
symm.o(.text$gsl_matrix_get+0x30):symm.c: undefined reference to
`_gsl_error'
symm.o(.text$gsl_matrix_get+0x66):symm.c: undefined reference to
`_gsl_error'
collect2: ld returned 1 exit status
make: *** [deletethis] Error 1
*********************************

Can someone tell me where i am going wrong. Sorry for the long post. I
tried being as concise as possible.

Thank you in advance.

Gaurav

Re: Linking error problem related to #includes

[Kevin S D Beach]

On Sat, 2003-03-29 at 17:13, Gaurav Bansal wrote:
> Hello
> 
> I have a program that uses gnu-gsl eigen value library.

> $ make
> g++ -Igsl -o deletethis.o -c deletethis.cpp
> g++ -Igsl -o matrix.o -c matrix.cpp
> g++ -Igsl -o vector_ops.o -c vector_ops.cpp
> g++ -Igsl -o utility.o -c utility.cpp
> g++ -Igsl -o qrstep.o -c qrstep.c
> g++ -Igsl -o symm.o -c symm.c
> g++ -Igsl deletethis.o matrix.o vector_ops.o utility.o symm.o qrstep.o

You need to tell the linker which gsl libraries you're using and to
specify the directory using the -L flag.  For example, on my machine I
might compile with something like

g++ -I/mit/gnusl/include test.cc -L/mit/gnusl/lib -lgsl -lgslcblas -lm

Kevin