undefined reference problem for a function

[shamjs]

Hi All,
im compiling using g++,the compiler is reporting error as
undefined reference to `svm_destroy_model'
here is my sample code

/********svm.h***********/
#ifndef _LIBSVM_H
#define _LIBSVM_H

#define LIBSVM_VERSION 288

#ifdef __cplusplus
extern "C" {
#endif

struct svm_model
{
.
.
};
void svm_destroy_model(struct svm_model *model);
.
.
#ifdef __cplusplus
}
#endif

#endif // _LIBSVM_H 

/********svm.cpp******/
void svm_binary_svc_probability(const svm_problem *prob, const svm_parameter *param, double Cp, double Cn, double& probA, double& probB)//this function is defined globally(line 1892)
{
.
.
.
svm_destroy_model(submodel);//line 1966
.
.
.
}
int svm_cross_validation(const svm_problem *prob, const svm_parameter *param, int nr_fold, double *target)//this function is defined globally
{
.
.
svm_destroy_model(submodel);//line 2488
.
.
}

void svm_destroy_model(svm_model* model)//defined globally(line 2970)
{
.
.
.
.
}

i have tried including body of function svm_destroy_model before line 1892 and including the prototype of the function but no use .....please help me in identifying this error
waiting for your reply.....................
thanx

[Rubberman]

So, you want svm_destroy_model(svm_model*) to have C rather than C++ bindings? Why? What is the purpose of that? In any case, if you want to use C bindings you still need to extern "C" the function, as in:

extern "C" void svm_destroy_model(struct svm_model* model)
{
.
.
.
}

Otherwise, you have a C-binding declaration, but a C++ definition, which in reality has a totally different function signature, hence the compiler/linker error.