C error: Expected expression

[Mark Brethen]

APIENTRY is defined in GL3.h. Snippet below,

/* Function declaration macros - to move into glplatform.h */

#if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
#define WIN32_LEAN_AND_MEAN 1
#include <windows.h>
#endif


#if defined(__APPLE__)
#define GL3_PROTOTYPES
#endif

#ifndef APIENTRY
#define APIENTRY
#endif
#ifndef APIENTRYP
#define APIENTRYP APIENTRY *
#endif
#ifndef GLAPI
#define GLAPI extern
#endif

/* Base GL types */
#include <OpenGL/gltypes.h>

#ifdef __cplusplus
extern "C" {
#endif


But the source only had these includes:

#include <GL/gl.h>
#include <GL/glu.h>

which I patched with OpenGL.

From GL3.h:

 * gl3.h is supposed to only include APIs in a OpenGL 3.1 (without
 * GL_ARB_compatibility) or OpenGL 3.2 or later core profile
 * implementation, as well as interfaces for newer ARB extensions which
 * can be supported by the core profile. It does not, and never will
 * include functionality removed from the core profile, such as
 * fixed-function vertex and fragment processing.
 *
 * Implementations of OpenGL 3.1 supporting the optional
 * GL_ARB_compatibility extension continue to provide that functionality,
 * as do implementations of the OpenGL 3.2+ compatibility profiles, and
 * source code requiring it should use the traditional <GL/gl.h> and
 * <GL/glext.h> headers instead of <GL3/gl3.h>.
 *
 * It is not possible to #include both <GL3/gl3.h> and either of
 * <GL/gl.h> or <GL/glext.h> in the same source file.

Do I need to patch the source and replace the GL includes with GL3? 


Mark Brethen
mark.brethen at gmail.com



> On Nov 13, 2018, at 8:57 AM, Chris Jones <jonesc at hep.phy.cam.ac.uk> wrote:
> 
> 
>> Perhaps a semicolon is needed? i.e.
>> int APIENTRY;
>> glutExtensionSupported(const char *extension)
> 
> nope, that is definitely invalid code.
> 
> As Joshua said, you need to investigate how APIENTRY is defined.
> 
> Chris
>