byte-compile-setq-default fix for bug#12195

* lisp/emacs-lisp/bytecomp.el (byte-compile-setq-default):
Optimize away setq-default with no args, as is done for setq.

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 606be46b1183334304d8e4d1f0a709d6eab57881..b58580f64298daaf9e2df456204e4ad393119bc4 100644 (file)
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2012-08-14  Glenn Morris  <rgm@gnu.org>
+
+       * emacs-lisp/bytecomp.el (byte-compile-setq-default):
+       Optimize away setq-default with no args, as for setq.  (Bug#12195)
+
 2012-08-14  Chong Yidong  <cyd@gnu.org>
 
        * minibuffer.el (read-file-name): Doc fix (Bug#10881).

diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index abfd73cb438c403aa728fc64e5b546a7939b7a22..10bc37c6dcd1ea1818add11952ef0de154897875 100644 (file)
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -3578,20 +3578,22 @@ discarding."
 
 (defun byte-compile-setq-default (form)
   (setq form (cdr form))
-  (if (> (length form) 2)
-      (let ((setters ()))
-        (while (consp form)
-          (push `(setq-default ,(pop form) ,(pop form)) setters))
-        (byte-compile-form (cons 'progn (nreverse setters))))
-    (let ((var (car form)))
-      (and (or (not (symbolp var))
-               (macroexp--const-symbol-p var t))
-           (byte-compile-warning-enabled-p 'constants)
-           (byte-compile-warn
-            "variable assignment to %s `%s'"
-            (if (symbolp var) "constant" "nonvariable")
-            (prin1-to-string var)))
-      (byte-compile-normal-call `(set-default ',var ,@(cdr form))))))
+  (if (null form)                      ; (setq-default), with no arguments
+      (byte-compile-form nil byte-compile--for-effect)
+    (if (> (length form) 2)
+       (let ((setters ()))
+         (while (consp form)
+           (push `(setq-default ,(pop form) ,(pop form)) setters))
+         (byte-compile-form (cons 'progn (nreverse setters))))
+      (let ((var (car form)))
+       (and (or (not (symbolp var))
+                (macroexp--const-symbol-p var t))
+            (byte-compile-warning-enabled-p 'constants)
+            (byte-compile-warn
+             "variable assignment to %s `%s'"
+             (if (symbolp var) "constant" "nonvariable")
+             (prin1-to-string var)))
+       (byte-compile-normal-call `(set-default ',var ,@(cdr form)))))))
 
 (byte-defop-compiler-1 set-default)
 (defun byte-compile-set-default (form)