Don't error when turning on Flymake with no known backends

Leave it to the mode line indicator to inform the user that there
is still some configuration to do.

* lisp/progmodes/flymake.el (flymake-mode): Simplify.

diff --git a/lisp/progmodes/flymake.el b/lisp/progmodes/flymake.el
index f61face25bf9bccc1e7b2c278a6a8be2efaf5721..ebd5a1ecee93eaf1815ea68d99c8eb3e3b4ad2d1 100644 (file)
--- a/lisp/progmodes/flymake.el
+++ b/lisp/progmodes/flymake.el
@@ -708,18 +708,14 @@ Interactively, with a prefix arg, FORCE is t."
   (cond
    ;; Turning the mode ON.
    (flymake-mode
-    (cond
-     ((not flymake-diagnostic-functions)
-      (flymake-error "No backends to check buffer %s" (buffer-name)))
-     (t
-      (add-hook 'after-change-functions 'flymake-after-change-function nil t)
-      (add-hook 'after-save-hook 'flymake-after-save-hook nil t)
-      (add-hook 'kill-buffer-hook 'flymake-kill-buffer-hook nil t)
-
-      (setq flymake--backend-state (make-hash-table))
-
-      (when flymake-start-syntax-check-on-find-file
-        (flymake-start)))))
+    (add-hook 'after-change-functions 'flymake-after-change-function nil t)
+    (add-hook 'after-save-hook 'flymake-after-save-hook nil t)
+    (add-hook 'kill-buffer-hook 'flymake-kill-buffer-hook nil t)
+
+    (setq flymake--backend-state (make-hash-table))
+
+    (when flymake-start-syntax-check-on-find-file
+      (flymake-start)))
 
    ;; Turning the mode OFF.
    (t