Undefined reference with Eclipse for source in different directory - c++

Question

I have an old source which I need to integrate in my project in Eclipse (in Ubuntu 12.04).
The old source code works perfectly on its own. But the only problem with it is - I have just one .cpp file (which contains the main) and all others are .h files which contains the definitions and declarations. I fixed this by creating a source file for each header file and copying the function definitions in these files and left the declarations in the header files.
I added these files using eclipse so those files actually are getting compiled.
Note that, I have added this source code into "src/segment". Here is my directory listing. These files also show up in the eclipse project. My main function is in "HelloOpenCV2.cpp"
[eeuser#roadrunner src]$ ls
CameraPoseFromFundamentalMatrix.d InterestPoints.o
CameraPoseFromFundamentalMatrix.o LinesAndComponents.d
GLViz.d LinesAndComponents.o
GLViz.o MorphologicalManip.d
GraphImageSegmentation.d MorphologicalManip.o
GraphImageSegmentation.o MultiviewColorConsistency.d
HelloOpenCV2.d MultiviewColorConsistency.o
HelloOpenCV2.o segment
HomographyWarp.d StereoCamDepth.d
HomographyWarp.o StereoCamDepth.o
ImageManipulations.d subdir.mk
ImageManipulations.o VideoProc.d
InterestPoints.d VideoProc.o
[eeuser#roadrunner src]$ ls segment/
convolve.d filter.d imconv.d segment-graph.d subdir.mk
convolve.o filter.o imconv.o segment-graph.o
disjoint-set.d image.d imutil.d segment-image.d
disjoint-set.o image.o imutil.o segment-image.o
Here is my compilation log as generated by eclipse.
18:54:21 **** Build of configuration Debug for project HelloOpenCV2 ****
make all
Building file: ../src/segment/convolve.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/convolve.d" -MT"src/segment/convolve.d" -o "src/segment/convolve.o" "../src/segment/convolve.cpp"
Finished building: ../src/segment/convolve.cpp
Building file: ../src/segment/disjoint-set.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/disjoint-set.d" -MT"src/segment/disjoint-set.d" -o "src/segment/disjoint-set.o" "../src/segment/disjoint-set.cpp"
Finished building: ../src/segment/disjoint-set.cpp
Building file: ../src/segment/filter.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/filter.d" -MT"src/segment/filter.d" -o "src/segment/filter.o" "../src/segment/filter.cpp"
Finished building: ../src/segment/filter.cpp
Building file: ../src/segment/image.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/image.d" -MT"src/segment/image.d" -o "src/segment/image.o" "../src/segment/image.cpp"
Finished building: ../src/segment/image.cpp
Building file: ../src/segment/imconv.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/imconv.d" -MT"src/segment/imconv.d" -o "src/segment/imconv.o" "../src/segment/imconv.cpp"
Finished building: ../src/segment/imconv.cpp
Building file: ../src/segment/imutil.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/imutil.d" -MT"src/segment/imutil.d" -o "src/segment/imutil.o" "../src/segment/imutil.cpp"
Finished building: ../src/segment/imutil.cpp
Building file: ../src/segment/segment-graph.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/segment-graph.d" -MT"src/segment/segment-graph.d" -o "src/segment/segment-graph.o" "../src/segment/segment-graph.cpp"
Finished building: ../src/segment/segment-graph.cpp
Building file: ../src/segment/segment-image.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/segment/segment-image.d" -MT"src/segment/segment-image.d" -o "src/segment/segment-image.o" "../src/segment/segment-image.cpp"
Finished building: ../src/segment/segment-image.cpp
Building file: ../src/CameraPoseFromFundamentalMatrix.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/CameraPoseFromFundamentalMatrix.d" -MT"src/CameraPoseFromFundamentalMatrix.d" -o "src/CameraPoseFromFundamentalMatrix.o" "../src/CameraPoseFromFundamentalMatrix.cpp"
Finished building: ../src/CameraPoseFromFundamentalMatrix.cpp
Building file: ../src/GLViz.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/GLViz.d" -MT"src/GLViz.d" -o "src/GLViz.o" "../src/GLViz.cpp"
Finished building: ../src/GLViz.cpp
Building file: ../src/GraphImageSegmentation.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/GraphImageSegmentation.d" -MT"src/GraphImageSegmentation.d" -o "src/GraphImageSegmentation.o" "../src/GraphImageSegmentation.cpp"
Finished building: ../src/GraphImageSegmentation.cpp
Building file: ../src/HelloOpenCV2.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/HelloOpenCV2.d" -MT"src/HelloOpenCV2.d" -o "src/HelloOpenCV2.o" "../src/HelloOpenCV2.cpp"
Finished building: ../src/HelloOpenCV2.cpp
Building file: ../src/HomographyWarp.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/HomographyWarp.d" -MT"src/HomographyWarp.d" -o "src/HomographyWarp.o" "../src/HomographyWarp.cpp"
Finished building: ../src/HomographyWarp.cpp
Building file: ../src/ImageManipulations.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/ImageManipulations.d" -MT"src/ImageManipulations.d" -o "src/ImageManipulations.o" "../src/ImageManipulations.cpp"
Finished building: ../src/ImageManipulations.cpp
Building file: ../src/InterestPoints.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/InterestPoints.d" -MT"src/InterestPoints.d" -o "src/InterestPoints.o" "../src/InterestPoints.cpp"
Finished building: ../src/InterestPoints.cpp
Building file: ../src/LinesAndComponents.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/LinesAndComponents.d" -MT"src/LinesAndComponents.d" -o "src/LinesAndComponents.o" "../src/LinesAndComponents.cpp"
Finished building: ../src/LinesAndComponents.cpp
Building file: ../src/MorphologicalManip.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/MorphologicalManip.d" -MT"src/MorphologicalManip.d" -o "src/MorphologicalManip.o" "../src/MorphologicalManip.cpp"
Finished building: ../src/MorphologicalManip.cpp
Building file: ../src/MultiviewColorConsistency.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/MultiviewColorConsistency.d" -MT"src/MultiviewColorConsistency.d" -o "src/MultiviewColorConsistency.o" "../src/MultiviewColorConsistency.cpp"
Finished building: ../src/MultiviewColorConsistency.cpp
Building file: ../src/StereoCamDepth.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/StereoCamDepth.d" -MT"src/StereoCamDepth.d" -o "src/StereoCamDepth.o" "../src/StereoCamDepth.cpp"
Finished building: ../src/StereoCamDepth.cpp
Building file: ../src/VideoProc.cpp
Invoking: GCC C++ Compiler
g++ -I/usr/local/include/opencv -I/usr/local/include -O0 -g3 -w -c -fmessage-length=0 -MMD -MP -MF"src/VideoProc.d" -MT"src/VideoProc.d" -o "src/VideoProc.o" "../src/VideoProc.cpp"
Finished building: ../src/VideoProc.cpp
Building target: HelloOpenCV2
Invoking: GCC C++ Linker
g++ -L/usr/local/lib -o "HelloOpenCV2" ./src/segment/convolve.o ./src/segment/disjoint-set.o ./src/segment/filter.o ./src/segment/image.o ./src/segment/imconv.o ./src/segment/imutil.o ./src/segment/segment-graph.o ./src/segment/segment-image.o ./src/CameraPoseFromFundamentalMatrix.o ./src/GLViz.o ./src/GraphImageSegmentation.o ./src/HelloOpenCV2.o ./src/HomographyWarp.o ./src/ImageManipulations.o ./src/InterestPoints.o ./src/LinesAndComponents.o ./src/MorphologicalManip.o ./src/MultiviewColorConsistency.o ./src/StereoCamDepth.o ./src/VideoProc.o -lopencv_core -lGL -lGLU -lglut -lopencv_stitching -lopencv_contrib -lopencv_nonfree -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_flann -lopencv_imgproc -lopencv_highgui
../src/segment/filter.cpp:39: error: undefined reference to 'image<float>::image(int, int, bool)'
../src/segment/filter.cpp:40: error: undefined reference to 'image<float>::image(int, int, bool)'
../src/segment/filter.cpp:41: error: undefined reference to 'convolve_even(image<float>*, image<float>*, std::vector<float, std::allocator<float> >&)'
../src/segment/filter.cpp:42: error: undefined reference to 'convolve_even(image<float>*, image<float>*, std::vector<float, std::allocator<float> >&)'
../src/segment/filter.cpp:44: error: undefined reference to 'image<float>::~image()'
../src/segment/filter.cpp:52: error: undefined reference to 'imageUCHARtoFLOAT(image<unsigned char>*)'
../src/segment/filter.cpp:54: error: undefined reference to 'image<float>::~image()'
../src/segment/filter.cpp:63: error: undefined reference to 'image<float>::image(int, int, bool)'
../src/segment/imconv.cpp:15: error: undefined reference to 'image<unsigned char>::image(int, int, bool)'
../src/segment/imconv.cpp:31: error: undefined reference to 'image<rgb>::image(int, int, bool)'
../src/segment/imconv.cpp:46: error: undefined reference to 'image<float>::image(int, int, bool)'
../src/segment/imconv.cpp:73: error: undefined reference to 'image<unsigned char>::image(int, int, bool)'
../src/segment/imconv.cpp:90: error: undefined reference to 'void min_max<float>(image<float>*, float*, float*)'
../src/segment/imconv.cpp:97: error: undefined reference to 'image<long>::image(int, int, bool)'
../src/segment/imconv.cpp:110: error: undefined reference to 'image<unsigned char>::image(int, int, bool)'
../src/segment/imconv.cpp:127: error: undefined reference to 'void min_max<long>(image<long>*, long*, long*)'
../src/segment/imconv.cpp:135: error: undefined reference to 'image<unsigned char>::image(int, int, bool)'
../src/segment/imconv.cpp:152: error: undefined reference to 'void min_max<short>(image<short>*, short*, short*)'
../src/segment/segment-image.cpp:62: error: undefined reference to 'smooth(image<float>*, float)'
../src/segment/segment-image.cpp:63: error: undefined reference to 'smooth(image<float>*, float)'
../src/segment/segment-image.cpp:64: error: undefined reference to 'smooth(image<float>*, float)'
../src/segment/segment-image.cpp:65: error: undefined reference to 'image<float>::~image()'
../src/segment/segment-image.cpp:66: error: undefined reference to 'image<float>::~image()'
../src/segment/segment-image.cpp:120: error: undefined reference to 'image<rgb>::image(int, int, bool)'
../src/segment/segment-image.cpp:121: error: undefined reference to 'image<int>::image(int, int, bool)'
../src/segment/pnmfile.h:166: error: undefined reference to 'image<rgb>::image(int, int, bool)'
../src/segment/pnmfile.h:166: error: undefined reference to 'image<rgb>::image(int, int, bool)'
collect2: ld returned 1 exit status
make: *** [HelloOpenCV2] Error 1
18:54:30 Build Finished (took 8s.826ms)
I can also confirm that .o (object) files for each of the source files are generated. However, I do not understand how to fix the undefined reference error.
Would like to add that the file image.cpp / image.h contain a class definition. I have not added these 2 files as add->class have added them as add->source and add->header
Just applied "nm" command on image.o. Got an empty response. Although image.o is a 24 byte file.
image.h contains the template class declaration and image.cpp contains class function definition.
Image is a template class. The header and source for it are as -
/*
* image.h
*
* Created on: 25 Oct, 2014
* Author: eeuser
*/
#ifndef IMAGE_H_
#define IMAGE_H_
#include <cstring>
/* use imRef to access image data. */
#define imRef(im, x, y) (im->access[y][x])
/* use imPtr to get pointer to image data. */
#define imPtr(im, x, y) &(im->access[y][x])
template <class T>
class image {
public:
/* create an image */
image(int width, int height, bool init = true);
/* delete an image */
~image();
/* init an image */
void init(const T &val);
/* copy an image */
image<T> *copy() const;
/* get the width of an image. */
int width() const { return w; }
/* get the height of an image. */
int height() const { return h; }
/* image data. */
T *data;
/* row pointers. */
T **access;
private:
int w, h;
};
#endif /* IMAGE_H_ */
The source:
/*
* image.cpp
*
* Created on: 25 Oct, 2014
* Author: eeuser
*/
#include "image.h"
template <class T>
image<T>::image(int width, int height, bool init) {
w = width;
h = height;
data = new T[w * h]; // allocate space for image data
access = new T*[h]; // allocate space for row pointers
// initialize row pointers
for (int i = 0; i < h; i++)
access[i] = data + (i * w);
if (init)
memset(data, 0, w * h * sizeof(T));
}
template <class T>
image<T>::~image() {
delete [] data;
delete [] access;
}
template <class T>
void image<T>::init(const T &val) {
T *ptr = imPtr(this, 0, 0);
T *end = imPtr(this, w-1, h-1);
while (ptr <= end)
*ptr++ = val;
}
template <class T>
image<T> *image<T>::copy() const {
image<T> *im = new image<T>(w, h, false);
memcpy(im->data, data, w * h * sizeof(T));
return im;
}
I turned on the extra warning flags in g++ (-Wextra). It complained about a bunch of static functions I had. I just changed those to normal functions. I guess this is ok, since those functions were not associated with a class.