forward declare HeadlessDisplay in headless_view.hpp

common/headless_display.cpp

@@ -1,4 +1,4 @@
-#include "headless_view.hpp"
+#include "headless_display.hpp"
 
 #include <stdexcept>
 

common/headless_display.hpp

@@ -1,14 +1,7 @@
 #ifndef MBGL_COMMON_HEADLESS_DISPLAY
 #define MBGL_COMMON_HEADLESS_DISPLAY
 
-#ifdef __APPLE__
-#define MBGL_USE_CGL 1
-#else
-#include <GL/glx.h>
-#define MBGL_USE_GLX 1
-#endif
-
-#include <mbgl/platform/gl.hpp>
+#include "headless_view.hpp"
 
 namespace mbgl {
 

common/headless_view.cpp

@@ -1,4 +1,5 @@
 #include "headless_view.hpp"
+#include "headless_display.hpp"
 
 #include <stdexcept>
 

common/headless_view.hpp

@@ -1,12 +1,20 @@
 #ifndef MBGL_COMMON_HEADLESS_VIEW
 #define MBGL_COMMON_HEADLESS_VIEW
 
-#include "headless_display.hpp"
+#ifdef __APPLE__
+#define MBGL_USE_CGL 1
+#else
+#include <GL/glx.h>
+#define MBGL_USE_GLX 1
+#endif
 
 #include <mbgl/map/view.hpp>
+#include <mbgl/platform/gl.hpp>
 
 namespace mbgl {
 
+class HeadlessDisplay;
+
 class HeadlessView : public View {
 public:
     HeadlessView();