linking error

You defined the variable in several translation units. The usual reason for that is that the variable is defined in a header (some fool will probably suggest that you use header guards, but they're not relevant).

Global variables should be declared in a header file, preceded by the extern keyword:

extern type variable_name;

And then, defined in a single source file, perhaps being given a value:

type variable_name = value;

If you didn't intend for the variables to be global, post the code where they are defined.

here is the code:
//////////////////
/*
Model.h

Abstract base class for a model. The specific extended class will render the given model.

Author: Brett Porter
Email: brettporter@yahoo.com
Website: http://rsn.gamedev.net
Copyright (C)2001, Brett Porter. All Rights Reserved.

This file may be used only as long as this copyright notice remains intact.
*/

#ifndef MODEL_H
#define MODEL_H

#include "Matrix.h"
#include "Timer.h"
double m_FPS;
double m_totalFrames;
int startframe=1;
int endframe=1;
class Model
{
public:
// Mesh
struct Mesh
{
int m_materialIndex;
int m_numTriangles;
int *m_pTriangleIndices;
};

// Material properties
struct Material
{
float m_ambient[4], m_diffuse[4], m_specular[4], m_emissive[4];
float m_shininess;
GLuint m_texture;
char *m_pTextureFilename;
};

// Triangle structure
struct Triangle
{
float m_vertexNormals[3][3];
float m_s[3], m_t[3];
int m_vertexIndices[3];
};

// Vertex structure
struct Vertex
{
char m_boneID; // for skeletal animation
float m_location[3];
};

// { NEW }
// Animation keyframe information
struct Keyframe
{
int m_jointIndex;
float m_time; // in milliseconds
float m_parameter[3];
};

// Skeleton bone joint
struct Joint
{
float m_localRotation[3];
float m_localTranslation[3];
Matrix m_absolute, m_relative;

int m_numRotationKeyframes, m_numTranslationKeyframes;
Keyframe *m_pTranslationKeyframes;
Keyframe *m_pRotationKeyframes;

int m_currentTranslationKeyframe, m_currentRotationKeyframe;
Matrix m_final;

int m_parent;
};
// { end NEW }
///////////////////////


this is project link:
www.rasaonline.ir/walker.zip

this project will work good if press F5 an run it
but if select 'rebuild all' will be harmed and not work

thanks

double m_FPS;double m_totalFrames;int startframe=1;int endframe=1;

If you do not wish these variables to be global, you might want to group them into appropriate classes or structures. Otherwise, just use my above explanation.

Quote:

Original post by prince_of_persia double m_FPS; double m_totalFrames; int startframe=1; int endframe=1;

A quick fix would be to declare these variables static (like "static double m_FPS"), which means you can only use them in this source file, and thus eliminates the conflict (since they aren't globals anymore). Others have posted more elegant fixes which are probably a better long term idea.

Geoff

Quote:

Original post by gdunbar Quote: Original post by prince_of_persia double m_FPS; double m_totalFrames; int startframe=1; int endframe=1; A quick fix would be to declare these variables static (like "static double m_FPS"), which means you can only use them in this source file, and thus eliminates the conflict (since they aren't globals anymore).

I doubt the poster really wants individual copies of those variables in each .cpp file, however.

no i declare static my vars but now i have this error

/*
MilkshapeModel.h

Loads and renders a Milkshape3D model.

Author: Brett Porter
Email: brettporter@yahoo.com
Website: http://rsn.gamedev.net
Copyright (C)2001, Brett Porter. All Rights Reserved.

This file may be used only as long as this copyright notice remains intact.
*/

#ifndef MILKSHAPEMODEL_H
#define MILKSHAPEMODEL_H

#include "Model.h"

static double m_FPS;
static double m_totalFrames;
static int startframe=1;
static int endframe=1;



class MilkshapeModel : public Model
{
public:
/* Constructor. */
MilkshapeModel();
////////////////////////////////error
--------------------Configuration: SkelAnimTut - Win32 Debug--------------------
Compiling...
Model.cpp
d:\new folder (2)\walker salem\walker salem\the press\model.cpp(262) : error C2065: 'startframe' : undeclared identifier
d:\new folder (2)\walker salem\walker salem\the press\model.cpp(262) : error C2065: 'm_FPS' : undeclared identifier
d:\new folder (2)\walker salem\walker salem\the press\model.cpp(264) : error C2065: 'endframe' : undeclared identifier
d:\new folder (2)\walker salem\walker salem\the press\model.cpp(264) : error C2065: 'm_totalFrames' : undeclared identifier
Error executing cl.exe.

SkelAnimTut.exe - 4 error(s), 0 warning(s)

Your globals should be marked as 'extern' in the header that declares them, and without the 'extern' in one single .cpp file.