Re: [Help-gsl] Random generator: linking problem

[Carl Boettiger]

If you compile an executable instead of an object file (without -c)
does it work?
-Carl

On Mon, May 11, 2009 at 8:02 AM, Marco Tului <address@hidden> wrote:
> Hi all,
> excuse me, I'm trying to compile a random generator C++ class for my
> library, in which I use the GSL. But even tough I compile without errors my
> hpp/cpp, when in a test main file I try to instantiate an object of it, I
> have these linking errors:
>
> ::::::::::::::::::::::::::::::::::::::::::::::
> /usr/bin/ld: Undefined symbols:
> _gsl_rng_alloc
> _gsl_rng_default
> _gsl_rng_free
> collect2: ld returned 1 exit status
> make: *** [default] Error 1
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>
> I have read the GSL manual, and in my Makefile I wrote:
>
> :::::::::::::::::::::::
> # RANDOM_NUMBER_GENERATOR
> random_generator.o: random_generator.hpp random_generator.cpp
> g++ -c random_generator.cpp -lgsl -lgslcblas -lm
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>
> as it seemed me correctly, so, why that? The hpp of my class is:
>
> :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
> #ifndef RANDOM_GENERATOR__HPP
> #define RANDOM_GENERATOR__HPP
>
>
> #include <gsl/gsl_rng.h> // here we use the "GNU Scientific Library" (GSL)
> to obtain a random number
> #include <gsl/gsl_randist.h> // to obtain gsl_ran_gaussian()
> #include <iostream>
> using namespace std;
>
>
> enum Distribution_type {
>  NORMAL = 1,
>  UNIFORM = 2,
>  BINARY = 3
> };
>
>
> class Random_generator {
>
>  private:
>    const gsl_rng_type *_type_gen;
>    gsl_rng *_gen; // 'gen' is the (random) generator
>
>    Distribution_type _distr_type;
>
>
>  public:
>    // default CONSTRUCTOR
>    Random_generator( ) {
>      _type_gen = gsl_rng_default;
>      _gen = gsl_rng_alloc(_type_gen); // in this way we allocate, in the
> standard way, the generator 'gen'
>    };
>
>    // DESTRUCTOR
>    ~Random_generator( ) {
>        gsl_rng_free(_gen); // we free the memory associated with the
> generator 'r'
>    };
>
>
>    double Get_rnd_generator( ) const { // by default we assume
> Distribution_type = NORMAL
>      return gsl_ran_gaussian(_gen, 1);
>    };
>
>    double Get_rnd_generator(Distribution_type distr_type_init) const {
>      if(distr_type_init == NORMAL) {
>        return gsl_ran_gaussian(_gen, 1);
>      }
>      else if(distr_type_init == UNIFORM) {
>        // vv return sample da distribuzione uniforme...
>      }
>      else if(distr_type_init == BINARY) {
>        // vv return sample da distribuzione binaria...
>      }
>    };
>
>
> };
>
>
> #endif
> ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
>
>
> The cpp file simply include that hpp. By the way, I've installed and
> compiled my GSL (with shared libraries option etc.) on my Mac Os 10.4.11.
>
>
>
>
> Thanks in advance, bye.
>
> Marco Tului.
> _______________________________________________
> Help-gsl mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/help-gsl
>



-- 
Carl Boettiger
Population Biology, UC Davis
http://two.ucdavis.edu/~cboettig