Wayland error reporting work.

src/wayland_init.c

@@ -102,7 +102,11 @@ int _glfwPlatformInit(void)
 {
     _glfw.wl.display = wl_display_connect(NULL);
     if (!_glfw.wl.display)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Wayland: Failed to connect to display");
         return GL_FALSE;
+    }
 
     _glfw.wl.registry = wl_display_get_registry(_glfw.wl.display);
     wl_registry_add_listener(_glfw.wl.registry, &registryListener, NULL);

src/wayland_monitor.c

@@ -123,7 +123,7 @@ void _glfwAddOutput(uint32_t name, uint32_t version)
     if (version < 2)
     {
         _glfwInputError(GLFW_PLATFORM_ERROR,
-                        "Unsupported wl_output interface version");
+                        "Wayland: Unsupported output interface version");
         return;
     }
 

src/wayland_window.c

@@ -143,7 +143,7 @@ void _glfwPlatformGetWindowPos(_GLFWwindow* window, int* xpos, int* ypos)
     // to (0, 0)
 
     _glfwInputError(GLFW_PLATFORM_ERROR,
-                    "Wayland does not allow manual window positioning");
+                    "Wayland: Window position retreival not supported");
 
     if (xpos)
         *xpos = 0;
@@ -156,7 +156,7 @@ void _glfwPlatformSetWindowPos(_GLFWwindow* window, int xpos, int ypos)
     // A Wayland client can not set its position, so just warn
 
     _glfwInputError(GLFW_PLATFORM_ERROR,
-                    "Wayland does not allow manual window positioning");
+                    "Wayland: Window position setting not supported");
 }
 
 void _glfwPlatformGetWindowSize(_GLFWwindow* window, int* width, int* height)
@@ -253,7 +253,7 @@ void _glfwPlatformSetCursorPos(_GLFWwindow* window, double x, double y)
 {
     // A Wayland client can not set the cursor position
     _glfwInputError(GLFW_PLATFORM_ERROR,
-                    "Wayland does not allow cursor positioning");
+                    "Wayland: Cursor position setting not supported");
 }
 
 void _glfwPlatformApplyCursorMode(_GLFWwindow* window)