How to link OpenGL with my own static library?

Question

My game project is split up into three parts:

1. Core (lib)
2. Editor (exe)
3. Game (exe)

I'm using OpenGL in both my Core and Game parts, but as soon as I try to call an OpenGL function in my Core library the application crashes. I assume this is because the static library is not being linked with OpenGL. The build process goes like this:

# core library
g++  -c  ... -std=c++0x -g  -o ... -I. -I. 
ar rcus libCore.a ...

# game exe
g++ -o Game ... -L. -L../Core/Debug/   -lCore -lglew32 -lglfw -lopengl32

Where ... stands for the various files. How can I link OpenGL with my static library?

Answer 1

Were you calling glewInit in your main game before core calls any GL functions? If not all the gl function pointers will be null and destined to seg fault. Is Glew built as a static library as well, or as a DLL? If it is built as a static library, is the GLEW_STATIC macro defined when you include it in you core lib? Conversely, if GLEW is built as a DLL, make sure the GLEW_BUILD macro is NOT defined when you include it in your core lib. If nothing is working, make sure you check you can call GL functions from inside you main executable code using GLEW, (and turn off all core library function calls).