Make 'load-dangerous-libraries' obsolete (Bug#37819)

When 'load-dangerous-libraries' was t, Emacs allowed loading .elc
files compiled by XEmacs.  This patch removes the support for that use
case, and declares the variable obsolete.

* lisp/subr.el (load-dangerous-libraries): Declare obsolete.
* src/lread.c (Fload): Ignore its value, and thereby refuse to load
files byte compiled by XEmacs.
(syms_of_lread): Update doc string of 'bytecomp-version-regexp' to not
refer to it.
* doc/emacs/building.texi (Lisp Libraries): Remove its documentation.

1 files changed, 0 insertions, 7 deletions

diff --git a/doc/emacs/building.texi b/doc/emacs/building.texi
index 02f18865f39..272b08d08e9 100644
--- a/doc/emacs/building.texi
+++ b/doc/emacs/building.texi
@@ -1528,13 +1528,6 @@ Automatic loading also occurs when completing names for
 prefix being completed.  To disable this feature, change the variable
 @code{help-enable-completion-autoload} to @code{nil}.
 
-@vindex load-dangerous-libraries
-@cindex Lisp files byte-compiled by XEmacs
-  By default, Emacs refuses to load compiled Lisp files which were
-compiled with XEmacs, a modified version of Emacs---they can cause
-Emacs to crash.  Set the variable @code{load-dangerous-libraries} to
-@code{t} if you want to try loading them.
-
 @node Lisp Eval
 @section Evaluating Emacs Lisp Expressions
 @cindex Emacs Lisp mode