OpenGL/glut/stdc++ build errors

6
votes

I'm using Ubuntu and tried using synaptic to install everything that had the word "GLUT" in it and also SDL and opengl . But still a simple program fails to compile . It shows this :

opengl1.cpp:(.text+0xe): undefined reference to `glClear'
opengl1.cpp:(.text+0x1a): undefined reference to `glBegin'
opengl1.cpp:(.text+0x2e): undefined reference to `glVertex2i'
opengl1.cpp:(.text+0x33): undefined reference to `glEnd'
opengl1.cpp:(.text+0x38): undefined reference to `glFlush'
/tmp/ccnwQeLu.o: In function `MyInit()':
opengl1.cpp:(.text+0x4c): undefined reference to `glGetString'
opengl1.cpp:(.text+0x57): undefined reference to `std::cout'
opengl1.cpp:(.text+0x5c): undefined reference to `std::basic_ostream >& std::operator >(std::basic_ostream >&, unsigned char const*)'
opengl1.cpp:(.text+0x6c): undefined reference to `std::basic_ostream >& std::operator >(std::basic_ostream >&, char const*)'
opengl1.cpp:(.text+0x78): undefined reference to `glGetString'
opengl1.cpp:(.text+0x83): undefined reference to `std::cout'
opengl1.cpp:(.text+0x88): undefined reference to `std::basic_ostream >& std::operator >(std::basic_ostream >&, unsigned char const*)'
opengl1.cpp:(.text+0x98): undefined reference to `std::basic_ostream >& std::operator >(std::basic_ostream >&, char const*)'
opengl1.cpp:(.text+0xc0): undefined reference to `glClearColor'
opengl1.cpp:(.text+0xdf): undefined reference to `glColor3f'
opengl1.cpp:(.text+0xec): undefined reference to `glPointSize'
opengl1.cpp:(.text+0xf8): undefined reference to `glMatrixMode'
opengl1.cpp:(.text+0xfd): undefined reference to `glLoadIdentity'
opengl1.cpp:(.text+0x12d): undefined reference to `gluOrtho2D'
/tmp/ccnwQeLu.o: In function `main':
opengl1.cpp:(.text+0x14a): undefined reference to `glutInit'
opengl1.cpp:(.text+0x156): undefined reference to `glutInitDisplayMode'
opengl1.cpp:(.text+0x16d): undefined reference to `glutInitWindowSize'
opengl1.cpp:(.text+0x181): undefined reference to `glutInitWindowPosition'
opengl1.cpp:(.text+0x18d): undefined reference to `glutCreateWindow'
opengl1.cpp:(.text+0x19e): undefined reference to `glutDisplayFunc'
opengl1.cpp:(.text+0x1a3): undefined reference to `glutMainLoop'
/tmp/ccnwQeLu.o: In function `__static_initialization_and_destruction_0(int, int)':
opengl1.cpp:(.text+0x1cb): undefined reference to `std::ios_base::Init::Init()'
opengl1.cpp:(.text+0x1d0): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccnwQeLu.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status

If I use g++ instead of gcc I get this: 

vim opebgl1.cpp
g++ opengl1.cpp -o opengl1 -lGL -lstdc++ -lc -lm
 and then get this :
/tmp/ccCJBuIl.o: In function `MyInit()':
opengl1.cpp:(.text+0x12d): undefined reference to `gluOrtho2D'
/tmp/ccCJBuIl.o: In function `main':
opengl1.cpp:(.text+0x14a): undefined reference to `glutInit'
opengl1.cpp:(.text+0x156): undefined reference to `glutInitDisplayMode'
opengl1.cpp:(.text+0x16d): undefined reference to `glutInitWindowSize'
opengl1.cpp:(.text+0x181): undefined reference to `glutInitWindowPosition'
opengl1.cpp:(.text+0x18d): undefined reference to `glutCreateWindow'
opengl1.cpp:(.text+0x19e): undefined reference to `glutDisplayFunc'
opengl1.cpp:(.text+0x1a3): undefined reference to `glutMainLoop'
collect2: ld returned 1 exit status

So what do I really need to start working with opengl in Ubuntu?

4
c++opengllinker-errorsglut
Are you linking in all the appropriate libraries when building your application? – Troubadour
I included these header files :#include <X11/Xlib.h> #include <GL/glut.h> – Dayanand shetake
Also, are you building with g++ or gcc? – Troubadour
Including header files is only half of what you need to do. That allows the program to compile but not link. The command that ultimately creates your application (or library) should link to the libraries you used otherwise it won't know where to get all these symbols from. Post your build commands and we can give you some pointers. – Troubadour
Use g++ to build C++ source. You'll find the errors relating to things like std::cout go away then. g++ is really just a wrapper around gcc that automatically links to the standard C++ libraries for you. If you use gcc you have to do it manually. It's far easier to use g++. – Troubadour

4 Answers

8
votes

Add "-lstdc++ -lGL" to your linker flags. Or try to compile it like this:

g++ opengl1.cpp -o opengl1 -lGL -lGLU -lc -lm

(edit: added -lGLU, removed -lstdc++)

3
votes

You should link it with glut and GLU as well:

g++ opengl1.cpp -o opengl1 -lGL -lstdc++ -lc -lm -lglut -lGLU

Files ended with .cpp must be compiled with g++. The rest of the errors are related to the linking process, and they should not happen if you build your application with the command I suggested above. If they do, make sure you have installed libglut and libglu.

2
votes

Make sure you are using g++ to build your C++ files to avoid the linker errors pertaining to the C++ standard library.

To resolve the GLUT symbols you probably just need to add -lglut to your final build command.

0
votes

While compiling the code you must mention some parameters according to your includes. You already used -lGL, -lm etc. To use gluOrtho2D the parameter to be used is -lGLU and for other functions that begin with glut use -lglut