No longer include timestamp in header of .elc files

This removes needless differences between files compiled at different
times or by different people, or from sources in different locations.
Ref: http://lists.gnu.org/archive/html/emacs-devel/2013-03/msg00187.html

* lisp/emacs-lisp/bytecomp.el (byte-compile-insert-header):
No longer include timestamp etc information.

* etc/NEWS: Mention this.

3 files changed, 8 insertions, 5 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 8f64aa6e7ee..83913bf88b8 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -75,6 +75,8 @@ Available only on X, this option allows to control over-scrolling
 using the scroll bar (i.e. dragging the thumb down even when the end
 of the buffer is visible).
 
+** In compiled Lisp files, the header no longer includes a timestamp.
+
 
 * Editing Changes in Emacs 24.4
 
diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 2f625deedc6..07a5bb9231d 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-20  Glenn Morris  <rgm@gnu.org>
+
+        * emacs-lisp/bytecomp.el (byte-compile-insert-header):
+        No longer include timestamp etc information.
+
 2013-04-20  Roland Winkler  <winkler@gnu.org>
 
         * faces.el (read-face-name): Bug fix, return just one face if arg
diff --git a/lisp/emacs-lisp/bytecomp.el b/lisp/emacs-lisp/bytecomp.el
index 5db1793a407..755d5f716d3 100644
--- a/lisp/emacs-lisp/bytecomp.el
+++ b/lisp/emacs-lisp/bytecomp.el
@@ -1997,11 +1997,7 @@ Call from the source buffer."
       ;; >4     byte            x               version %d
       (insert
        ";ELC" 23 "\000\000\000\n"
-       ";;; Compiled by "
-       (or (and (boundp 'user-mail-address) user-mail-address)
-           (concat (user-login-name) "@" (system-name)))
-       " on " (current-time-string) "\n"
-       ";;; from file " filename "\n"
+       ";;; Compiled\n"
        ";;; in Emacs version " emacs-version "\n"
        ";;; with"
        (cond