I've only seen this caused by people not linking their class objects together at build time, but I have, and I'm unsure what the matter is.
the source:
//test.cpp
#include "Point.h"
#include "Sphere.h"
#include "Scene.h"
int main(){
Sphere s;
Scene sc;
sc.img_plane.upper_left = Point(-1, 1, -3);
sc.img_plane.upper_right = Point(1, 1, -3);
sc.img_plane.lower_left = Point(-1, -1, -3);
sc.img_plane.lower_right = Point(1, -1, -3);
sc.width = 100;
sc.height = 100;
return 0;
}
the error:
test.cpp:(.text+0x17): undefined reference to `Sphere::Sphere()'
test.cpp:(.text+0x26): undefined reference to `Scene::Scene()'
test.cpp:(.text+0x192): undefined reference to `Scene::~Scene()'
test.cpp:(.text+0x1a1): undefined reference to `Sphere::~Sphere()'
test.cpp:(.text+0x1bf): undefined reference to `Scene::~Scene()'
test.cpp:(.text+0x1d3): undefined reference to `Sphere::~Sphere()'
the Makefile:
CC = g++
SRC = ./src
BUILD = ./build
main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
$(CC) $(BUILD)/main.o $(BUILD)/Point.o -o $(BUILD)/main
main.o : $(SRC)/test.cpp
$(CC) -c $< -o $(BUILD)/main.o
Point.o : $(SRC)/Point.cpp $(SRC)/Point.h
$(CC) -c $< -o $(BUILD)/Point.o
colort.o : $(SRC)/colort.cpp $(SRC)/colort.h
$(CC) -c $< -o $(BUILD)/colort.o
Sphere.o : $(SRC)/Sphere.cpp $(SRC)/Sphere.h $(SRC)/colort.cpp $(SRC)/Point.cpp
$(CC) -c $< -o $(BUILD)/Sphere.o
ImagePlane.o : $(SRC)/ImagePlane.cpp $(SRC)/ImagePlane.h
$(CC) -c $< -o $(BUILD)/ImagePlane.o
Scene.o : $(SRC)/Scene.cpp $(SRC)/Scene.h
$(CC) -c $< -o $(BUILD)/Scene.o
Ray.o : $(SRC)/Ray.cpp $(SRC)/Ray.h
$(CC) -c $< -o $(BUILD)/Ray.o
HitRecord.o : $(SRC)/HitRecord.cpp $(SRC)/HitRecord.h
$(CC) -c $< -o $(BUILD)/HitRecord.o
clean :
rm $(BUILD)/*
test : main
$(BUILD)/main
Scene constructor is the same as the Sphere:
Sphere.h:
#ifndef SPHERE_H_
#define SPHERE_H_
#include "colort.h"
#include "Point.h"
#include "Ray.h"
class Sphere {
public:
Sphere();
virtual ~Sphere();
Point center;
double radius;
color_t diffuse, specular;
double intersection(Ray r);
};
#endif /* SPHERE_H_ */
Sphere.cpp:
#include "Sphere.h"
#include <math.h>
Sphere::Sphere() {
}
Sphere::~Sphere() {
}
...other class functions
In your main
rule:
main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
$(CC) $(BUILD)/main.o $(BUILD)/Point.o -o $(BUILD)/main
Notice that although you mention Sphere.o as a dependency, you have not linked it. You need to include it on the build line, too:
main : main.o Point.o colort.o Sphere.o Scene.o Ray.o HitRecord.o
$(CC) $(BUILD)/main.o $(BUILD)/Point.o $(BUILD)/Sphere.o -o $(BUILD)/main
You probably also want to add the others, based on the fact that you list them as dependencies.
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