openglvisual c++
Compiling a file that uses OpenGL with Visual C++, when I try to include the gl.h header file I get about 150 unhelpful compile errors:
error C2144: syntax error : 'void' should be preceded by ';'
error C4430: missing type specifier – int assumed. Note: C++ does not support default-int
error C2146: syntax error : missing ';' before identifier 'glAccum'
etc.
You'll probably find that you won't be able to build even a basic Win32 application, let alone a wxWidgets app, with /Za, because the Windows Platform SDK headers included with VS2008 use language extensions. The only solution is to disable /Za.
The specific error you're seeing is because the _cdecl keyword is a Microsoft extension, and not part of standard C++.
For more information, see the documentation for /Za, and the Microsoft Extensions to C and C++ and C++ Keywords pages in MSDN.
Best Answer
Just
#include <windows.h>before<gl/gl.h>or<gl/glu.h>. It is needed for some types, such asWINGDIAPIandAPIENTRY.