From 5f24c36d305ccaebab51981b53adfab375319f49 Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Wed, 23 Nov 2022 15:52:08 +0100
Subject: [PATCH] backend: error out when missing DRM and libinput in
 wlr_backend_autocreate()

Instead of returning an empty multi backend, fail with a clear
error when both the DRM and libinput backends are disabled.

(cherry picked from commit fb4fb3bac2c7a73baf773cc6a0bba486f1c227b4)
---
 backend/backend.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/backend/backend.c b/backend/backend.c
index 4c886af67..08648f0bc 100644
--- a/backend/backend.c
+++ b/backend/backend.c
@@ -346,6 +346,11 @@ struct wlr_backend *wlr_backend_autocreate(struct wl_display *display) {
 	}
 #endif
 
+#if !(WLR_HAS_LIBINPUT_BACKEND || WLR_HAS_DRM_BACKEND)
+	wlr_log(WLR_ERROR, "Neither DRM nor libinput backend support is compiled in");
+	goto error;
+#endif
+
 	// Attempt DRM+libinput
 	multi->session = session_create_and_wait(display);
 	if (!multi->session) {