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Fix GLAPIENTRY redefinition warning

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On a Unix system, if you define GLFW_INCLUDE_NONE and
GLFW_EXPOSE_NATIVE_GLX, then include glfw3.h and glfw3native.h, you will
get a redefinition warning for GLAPIENTRY.

The glfw3.h header defines GLAPIENTRY as a service for OpenGL related
headers that assume it's already defined.  However, glx.h includes gl.h,
which defines GLAPIENTRY unconditionally.

If not for Hyrum's law, the better solution would have been not to
define GLAPIENTRY if GLFW_INCLUDE_NONE is defined.

Fixes #2010

This is adapted to 3.3-stable from
535c3ce632 and
ce85c7dcaf.
This commit is contained in:
Camilla Löwy 2022-03-15 17:51:57 +01:00
parent 3006c02bc2
commit e7a81f8aaa
2 changed files with 17 additions and 0 deletions
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1
include/GLFW/glfw3.h
View File

@ -5900,6 +5900,7 @@ GLFWAPI VkResult glfwCreateWindowSurface(VkInstance instance, GLFWwindow* window
*/
#ifndef GLAPIENTRY
#define GLAPIENTRY APIENTRY
#define GLFW_GLAPIENTRY_DEFINED
#endif
/* -------------------- END SYSTEM/COMPILER SPECIFIC --------------------- */

16
include/GLFW/glfw3native.h
View File

@ -111,12 +111,28 @@ extern "C" {
/* NSGL is declared by Cocoa.h */
#endif
#if defined(GLFW_EXPOSE_NATIVE_GLX)
/* This is a workaround for the fact that glfw3.h defines GLAPIENTRY because by
* default it also acts as an OpenGL header
* However, glx.h will include gl.h, which will define it unconditionally
*/
#if defined(GLFW_GLAPIENTRY_DEFINED)
#undef GLAPIENTRY
#undef GLFW_GLAPIENTRY_DEFINED
#endif
#include <GL/glx.h>
#endif
#if defined(GLFW_EXPOSE_NATIVE_EGL)
#include <EGL/egl.h>
#endif
#if defined(GLFW_EXPOSE_NATIVE_OSMESA)
/* This is a workaround for the fact that glfw3.h defines GLAPIENTRY because by
* default it also acts as an OpenGL header
* However, osmesa.h will include gl.h, which will define it unconditionally
*/
#if defined(GLFW_GLAPIENTRY_DEFINED)
#undef GLAPIENTRY
#undef GLFW_GLAPIENTRY_DEFINED
#endif
#include <GL/osmesa.h>
#endif