I've been trying to compile this OpenGL tutorial (originally purposed for Visual Studio) but I keep having 'undefined reference' errors. The compiler output is as follows:
Info: Internal Builder is used for build
g++ -o OpenGLTutorial.exe "src\\main.o" "src\\Camera.o" -lglew32 -lglu32 -lopengl32 -lfreeglut
src\main.o: In function `Z6InitGLiPPc':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:75: undefined reference to `glutInit'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:76: undefined reference to `glutSetOption'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:77: undefined reference to `glutGet'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:78: undefined reference to `glutGet'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:80: undefined reference to `glutInitDisplayMode'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:82: undefined reference to `glutInitContextVersion'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:83: undefined reference to `glutInitContextProfile'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:84: undefined reference to `glutInitContextFlags'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:86: undefined reference to `glutInitWindowPosition'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:87: undefined reference to `glutInitWindowSize'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:89: undefined reference to `glutCreateWindow'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:91: undefined reference to `glutIdleFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:92: undefined reference to `glutDisplayFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:93: undefined reference to `glutKeyboardFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:94: undefined reference to `glutKeyboardUpFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:95: undefined reference to `glutSpecialFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:96: undefined reference to `glutSpecialUpFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:97: undefined reference to `glutMouseFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:98: undefined reference to `glutMotionFunc'
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:99: undefined reference to `glutReshapeFunc'
src\main.o: In function `main':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:236: undefined reference to `glutMainLoop'
src\main.o: In function `Z9ReshapeGLii':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:249: undefined reference to `glutPostRedisplay'
src\main.o: In function `Z9DisplayGLv':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:262: undefined reference to `glutSwapBuffers'
src\main.o: In function `Z6IdleGLv':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:278: undefined reference to `glutPostRedisplay'
src\main.o: In function `Z10KeyboardGLhii':
C:\Users\jordanrich\Documents\programming\C++\GameDev\OpenGLTutorial\Debug/../src/main.cpp:313: undefined reference to `glutLeaveMainLoop'
collect2.exe: error: ld returned 1 exit status
21:39:05 Build Finished (took 1s.154ms)
Can anyone tell me what is wrong? If you need any more information to help answer the question just ask.
Edit (Some additional info): As you can see from the compiler output I have linked the library that these functions require and the compiler does not complain that it could not find said library. Also I placed the freeglut dll into the binary folder.
In my header file I defined FREEGLUT_STATIC. After changing this to another variable, the linker no longer produced errors. Though I can't actually check -- very easily at least -- somewhere in my freeglut library this variable was used in an ifndef statement to determine whether freeglut needed to be linked (in case it was already linked).