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(126) : warning C4005: 'APIENTRY' : redefinición de macro
2>        c:\users\ferran\directo\gameprojects\dev-libs\glfw\include\glfw.h(72) : vea la definición anterior de 'APIENTRY'
2>c:\program files\microsoft sdks\windows\v6.0a\include\wingdi.h(23) : warning C4005: 'WINGDIAPI' : redefinición de macro
2>        c:\users\ferran\directo\gameprojects\dev-libs\glfw\include\glfw.h(88) : vea la definición anterior de 'WINGDIAPI'

I'm sure that it's a matter of the order of the include files to solve, because none of these files are mine. My question is if there is a generic way to prevent this or to find which files must to be reordered to avoid this message.

Answer 1

The error message itself is telling you the incorrect order. It says that windef.h and wingdi.h are redefining symbols that were defined in glfw.h.

Put glfw.h after the Windows include files.

Answer 2

Microsoft doesn't generally design headers to be free-standing. Most of the Windows-oriented headers require that you have first included <windows.h>. Except for the dependency on that Mother Of All Headers, usually there are no specific header dependencies so by including <windows.h> first you shouldn't have any problem.