The max-lisp-eval-depth limit is sufficient to prevent unbounded stack
growth including the specbind stack; simplify matters for the user by
not having them to worry about two different limits.  This change
turns max-specpdl-size into a harmless variable with no effects,
to keep existing code happy.

* lisp/subr.el (max-specpdl-size):
Define as an ordinary (but obsolete) dynamic variable.
* admin/grammars/Makefile.in:
* doc/lispintro/emacs-lisp-intro.texi (Loops & Recursion):
* doc/lispref/control.texi (Cleanups):
* doc/lispref/edebug.texi (Checking Whether to Stop):
* doc/lispref/eval.texi (Eval):
* doc/lispref/variables.texi (Local Variables):
* doc/misc/calc.texi (Recursion Depth):
Update documentation.
* etc/NEWS: Announce.
* src/eval.c
(FletX): Use safe iteration to guard against circular bindings list.
(syms_of_eval): Remove old max-specpdl-size definition.
(init_eval_once, restore_stack_limits, call_debugger)
(signal_or_quit, grow_specpdl_allocation):
* leim/Makefile.in:
* lisp/Makefile.in:
* lisp/calc/calc-stuff.el (calc-more-recursion-depth)
(calc-less-recursion-depth):
* lisp/calc/calc.el (calc-do):
* lisp/cedet/semantic/ede-grammar.el (ede-proj-makefile-insert-rules):
* lisp/cedet/semantic/grammar.el (semantic-grammar-batch-build-one-package):
* lisp/cus-start.el (standard):
* lisp/emacs-lisp/comp.el (comp--native-compile):
* lisp/emacs-lisp/edebug.el (edebug-max-depth):
(edebug-read-and-maybe-wrap-form, edebug-default-enter):
* lisp/emacs-lisp/regexp-opt.el (regexp-opt):
* lisp/eshell/esh-mode.el (eshell-mode):
* lisp/loadup.el (max-specpdl-size):
* lisp/mh-e/mh-e.el (mh-invisible-headers):
* lisp/net/shr.el (shr-insert-document, shr-descend):
* lisp/play/hanoi.el (hanoi-internal):
* lisp/progmodes/cperl-mode.el:
* src/fileio.c (Fdo_auto_save):
Remove references to and modifications of max-specpdl-size.

* lisp/allout.el (allout-exposure-change-hook)
(allout-structure-added-hook, allout-structure-deleted-hook)
(allout-structure-shifted-hook):
* lisp/arc-mode.el (archive-extract-hooks):
* lisp/buff-menu.el (Buffer-menu-buffer+size-width):
* lisp/calendar/timeclock.el (timeclock-modeline-display)
(timeclock-modeline-display, timeclock-update-modeline):
* lisp/cedet/semantic/db-el.el
(semanticdb-elisp-sym-function-arglist):
* lisp/cedet/semantic/db-file.el (semanticdb-save-database-hooks):
* lisp/cedet/semantic/edit.el (semantic-change-hooks)
(semantic-edits-new-change-hooks)
(semantic-edits-delete-change-hooks)
(semantic-edits-reparse-change-hooks):
* lisp/cedet/semantic/lex.el (semantic-lex-reset-hooks):
* lisp/comint.el (comint--unquote&expand-filename)
(comint-unquote-filename):
* lisp/custom.el (user-variable-p):
* lisp/dired.el (dired-shrink-to-fit, dired-pop-to-buffer)
(dired-sort-set-modeline):
* lisp/ebuff-menu.el (Electric-buffer-menu-mode):
* lisp/emacs-lisp/byte-run.el (macro-declaration-function):
* lisp/emacs-lisp/checkdoc.el (custom-print-functions)
(checkdoc-comment-style-hooks):
* lisp/emacs-lisp/cl-lib.el (custom-print-functions):
* lisp/emacs-lisp/edebug.el (gud-inhibit-global-bindings):
* lisp/erc/erc-dcc.el (erc-dcc-chat-filter-hook):
* lisp/eshell/esh-mode.el (eshell-status-in-modeline):
* lisp/eshell/eshell.el (eshell-add-to-window-buffer-names)
(eshell-remove-from-window-buffer-names):
* lisp/faces.el (set-face-underline-p, font-list-limit):
* lisp/files.el (automount-dir-prefix, toggle-read-only):
* lisp/filesets.el (filesets-cache-fill-content-hooks):
* lisp/frame.el (automatic-hscrolling):
* lisp/generic-x.el (javascript-generic-mode)
(javascript-generic-mode-hook):
* lisp/gnus/gnus-start.el (gnus-subscribe-newsgroup-hooks):
* lisp/gnus/nndiary.el (nndiary-request-create-group-hooks)
(nndiary-request-update-info-hooks)
(nndiary-request-accept-article-hooks):
* lisp/htmlfontify.el (hfy-post-html-hooks):
* lisp/international/mule-cmds.el
(inactivate-current-input-method-function)
(inactivate-input-method, input-method-inactivate-hook)
(ucs-insert):
* lisp/international/quail.el (quail-inactivate)
(quail-inactivate-hook):
* lisp/international/robin.el (robin-inactivate)
(robin-inactivate-hook):
* lisp/leim/quail/hangul.el (hangul-input-method-inactivate):
* lisp/leim/quail/uni-input.el (ucs-input-inactivate):
* lisp/mail/emacsbug.el (report-emacs-bug-info):
* lisp/mh-e/mh-e.el (mh-kill-folder-suppress-prompt-hooks):
* lisp/mpc.el (mpc-string-prefix-p):
* lisp/net/rcirc.el (rcirc-print-hooks, rcirc-sentinel-hooks)
(rcirc-receive-message-hooks, rcirc-activity-hooks):
* lisp/obsolete/crisp.el (crisp-mode-modeline-string):
* lisp/pcomplete.el (pcomplete-arg-quote-list)
(pcomplete-quote-argument):
* lisp/progmodes/cc-mode.el (c-prepare-bug-report-hooks):
* lisp/progmodes/python.el (python-info-ppss-context)
(python-info-ppss-context-type)
(python-info-ppss-comment-or-string-p, python-indent)
(python-guess-indent, python-buffer, python-preoutput-result)
(python-proc, python-send-receive, python-send-string)
(python-use-skeletons):
* lisp/progmodes/sh-script.el (sh-maybe-here-document):
* lisp/replace.el (query-replace-interactive):
* lisp/strokes.el (strokes-modeline-string):
* lisp/subr.el (redraw-modeline):
* lisp/term.el (term-default-fg-color, term-default-bg-color):
* lisp/textmodes/tex-mode.el (latex-string-prefix-p)
(tex-string-prefix-p):
* lisp/url/url-parse.el (url-recreate-url-attributes):
* lisp/vc/add-log.el (change-log-acknowledgement):
* lisp/vc/ediff-wind.el
(ediff-choose-window-setup-function-automatically):
* lisp/vc/pcvs-util.el (cvs-string-prefix-p):
* lisp/vc/vc.el (vc-string-prefix-p):
* lisp/window.el (display-buffer-function):
* lisp/winner.el (winner-mode-leave-hook): Remove many functions and
variables obsolete since 24.3.

* lisp/buff-menu.el (list-buffers--refresh):
* lisp/dired.el (dired-mode-map):
* lisp/files.el (abbreviate-file-name):
* lisp/generic-x.el (generic-default-modes):
* lisp/mh-e/mh-funcs.el (mh-kill-folder):
* lisp/progmodes/hideif.el (hide-ifdef-mode-submap):
* lisp/replace.el (query-replace-read-from):
* lisp/term.el (term):
* lisp/window.el (display-buffer): Don't use above deleted
functions and variables.

* src/marker.c (Fbuffer_has_markers_at): Delete DEFUN obsolete
since 24.3.
(syms_of_marker) <Sbuffer_has_markers_at>: Delete defsubr.
* lisp/subr.el (buffer-has-markers-at): Remove obsoletion
of above deleted DEFUN.
* etc/TODO: Doc fix; don't mention above deleted function.

* admin/cus-test.el (cus-test-get-options):
* lisp/pcomplete.el: Doc fixes; don't mention removed items.
; * etc/NEWS: List removed items.

* lisp/mh-e/mh-utils.el (mh-colors-available-p): Redefine as
obsolete function alias for 'display-color-p'.

* lisp/subr.el (point-at-eol, point-at-bol): Make XEmacs compat
aliases obsolete in favor of `pos-bol'/'line-beginning-position' or
'pos-eol'/'line-end-position'.  Update callers.
Ref: https://lists.gnu.org/r/emacs-devel/2022-08/msg00853.html

* doc/misc/gnus-faq.texi (FAQ 8-2):
* doc/misc/gnus.texi (Security):
* doc/misc/message.texi (Using OpenPGP, PGP Compatibility):
* doc/misc/mh-e.texi (Reading PGP, Sending PGP):
* lisp/gnus/mml2015.el (mml2015-use):
* lisp/info-look.el (mapc):
* lisp/mh-e/mh-e.el (mh-mml-method-default): Advertise obsolete
library pgg.el less.

* lisp/mh-e/mh-identity.el (mh-identity-pgg-default-user-id): Rename
from 'mh-identity-gpg-default-user-id', and make the old name into
obsolete variable alias.  Update all uses.