st/oxr: Check for compile definitions after includes

If the defines are set in a header instead of with the compiler, they need
to be checked after includes.

Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2194>

src/xrt/state_trackers/oxr/oxr_session_gfx_egl.c

@@ -9,10 +9,6 @@
  * @ingroup comp_client
  */
 
-#ifndef XR_USE_PLATFORM_EGL
-#error "Must build this file with EGL enabled!"
-#endif
-
 #include <stdlib.h>
 
 #include "util/u_misc.h"
@@ -30,6 +26,10 @@
 #include "xrt/xrt_gfx_egl.h"
 
 
+#ifndef XR_USE_PLATFORM_EGL
+#error "Must build this file with EGL enabled!"
+#endif
+
 // Not forward declared by mesa
 typedef EGLBoolean(EGLAPIENTRYP PFNEGLQUERYCONTEXTPROC)(EGLDisplay dpy,
                                                         EGLContext ctx,

src/xrt/state_trackers/oxr/oxr_session_gfx_gl_win32.c

@@ -9,14 +9,6 @@
  * @ingroup comp_client
  */
 
-#ifndef XR_USE_PLATFORM_WIN32
-#error "Must build this file with Win32 enabled!"
-#endif
-
-#ifndef XR_USE_GRAPHICS_API_OPENGL
-#error "Must build this file with OpenGL enabled!"
-#endif
-
 #include <stdlib.h>
 
 #include "util/u_misc.h"
@@ -30,6 +22,14 @@
 #include "xrt/xrt_gfx_win32.h"
 
 
+#ifndef XR_USE_PLATFORM_WIN32
+#error "Must build this file with Win32 enabled!"
+#endif
+
+#ifndef XR_USE_GRAPHICS_API_OPENGL
+#error "Must build this file with OpenGL enabled!"
+#endif
+
 XrResult
 oxr_session_populate_gl_win32(struct oxr_logger *log,
                               struct oxr_system *sys,

src/xrt/state_trackers/oxr/oxr_session_gfx_gl_xlib.c

@@ -8,14 +8,6 @@
  * @ingroup comp_client
  */
 
-#ifndef XR_USE_PLATFORM_XLIB
-#error "Must build this file with XLIB enabled!"
-#endif
-
-#ifndef XR_USE_GRAPHICS_API_OPENGL
-#error "Must build this file with OpenGL enabled!"
-#endif
-
 #include <stdlib.h>
 
 #include "util/u_misc.h"
@@ -29,6 +21,14 @@
 #include "xrt/xrt_gfx_xlib.h"
 
 
+#ifndef XR_USE_PLATFORM_XLIB
+#error "Must build this file with XLIB enabled!"
+#endif
+
+#ifndef XR_USE_GRAPHICS_API_OPENGL
+#error "Must build this file with OpenGL enabled!"
+#endif
+
 XrResult
 oxr_session_populate_gl_xlib(struct oxr_logger *log,
                              struct oxr_system *sys,

src/xrt/state_trackers/oxr/oxr_session_gfx_gles_android.c

@@ -10,10 +10,6 @@
  * @ingroup comp_client
  */
 
-#ifndef XR_USE_GRAPHICS_API_OPENGL_ES
-#error "Must build this file with OpenGL ES enabled!"
-#endif
-
 #include <stdlib.h>
 
 #include "util/u_misc.h"
@@ -34,6 +30,10 @@
 #include <dlfcn.h>
 
 
+#ifndef XR_USE_GRAPHICS_API_OPENGL_ES
+#error "Must build this file with OpenGL ES enabled!"
+#endif
+
 XrResult
 oxr_session_populate_gles_android(struct oxr_logger *log,
                                   struct oxr_system *sys,

src/xrt/state_trackers/oxr/oxr_session_gfx_vk.c

@@ -8,10 +8,6 @@
  * @ingroup comp_client
  */
 
-#ifndef XR_USE_GRAPHICS_API_VULKAN
-#error "Must build this file with Vulkan enabled!"
-#endif
-
 #include "xrt/xrt_instance.h"
 #include "xrt/xrt_handles.h"
 #include "xrt/xrt_gfx_vk.h"
@@ -27,6 +23,10 @@
 #include "oxr_handle.h"
 
 
+#ifndef XR_USE_GRAPHICS_API_VULKAN
+#error "Must build this file with Vulkan enabled!"
+#endif
+
 DEBUG_GET_ONCE_BOOL_OPTION(force_timeline_semaphores, "OXR_DEBUG_FORCE_TIMELINE_SEMAPHORES", false)
 DEBUG_GET_ONCE_BOOL_OPTION(force_debug_utils, "OXR_DEBUG_FORCE_VK_DEBUG_UTILS", false)