How to prevent macro redefinition

Question

After working some time on my project, this warning begins to appear:

2>Game.cpp
2>c:\\program files\\microsoft sdks\\windows\\v6.0a\\include\\windef.h         


        

Answer 1

This may be caused by Visual Studio pre-compiling headers for you. Be sure that all standard and microsoft headers are included before yours. Don't include microsoft headers in any of your .h files (it looks like you have windef.h and wingdi.h inlcuded in your glfw.h). Be sure that all your headers are side-effect free. The problem should then go away. Figuring out exactly what is causing it is generally very hard.