From a199efae44d5bc17d2223440fef3afc28a659e90 Mon Sep 17 00:00:00 2001
From: Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
Date: Sun, 3 Dec 2017 03:56:39 +0100
Subject: [PATCH] Wayland: Emit an error when wl_shell is absent or unusable

---
 src/wl_window.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/wl_window.c b/src/wl_window.c
index cb4638eb..108218b8 100644
--- a/src/wl_window.c
+++ b/src/wl_window.c
@@ -236,10 +236,21 @@ static GLFWbool createSurface(_GLFWwindow* window,
 
 static GLFWbool createShellSurface(_GLFWwindow* window)
 {
+    if (!_glfw.wl.shell)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Wayland: wl_shell protocol not available");
+        return GLFW_FALSE;
+    }
+
     window->wl.shellSurface = wl_shell_get_shell_surface(_glfw.wl.shell,
                                                          window->wl.surface);
     if (!window->wl.shellSurface)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "Wayland: Shell surface creation failed");
         return GLFW_FALSE;
+    }
 
     wl_shell_surface_add_listener(window->wl.shellSurface,
                                   &shellSurfaceListener,