* lisp/emacs-lisp/bytecomp.el (byte-compile-dynamic): Mark obsolete

See bug#11649 for an example problem, and emacs-devel discussion
«Prickliness of the "invalid byte code" stuff».

* lisp/wid-edit.el, lisp/wdired.el, lisp/vc/pcvs-util.el:
* lisp/progmodes/executable.el, lisp/mail/sendmail.el:
* lisp/emacs-lisp/cl-seq.el, lisp/emacs-lisp/cl-macs.el:
* lisp/emacs-lisp/cl-lib.el, lisp/emacs-lisp/cl-extra.el:
* lisp/dired-x.el, lisp/dired-aux.el, lisp/calendar/calendar.el:
Don't use byte-compile-dynamic any more.

1 files changed, 6 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index f880e393c02..fabf5a3341b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -472,6 +472,12 @@ current and the previous or the next line, as before.
 
 * Changes in Specialized Modes and Packages in Emacs 27.1
 
+** byte compiler
+*** byte-compile-dynamic is now obsolete
+This is because on the one hand it suffers from various misbehaviors in corner
+cases that have plagued it for years, and on the other experiments indicated
+that it doesn't bring any measurable benefit.
+
 ** compile.el
 ---
 *** In 'compilation-error-regexp-alist', 'line' (and 'end-line') can