This removes the need for GCPRO1 etc.  Suggested by Stefan Monnier in:
http://lists.gnu.org/archive/html/emacs-devel/2015-08/msg00918.html
* doc/lispref/internals.texi (Writing Emacs Primitives):
* etc/NEWS:
Document the change.
* src/alloc.c (gcprolist, dump_zombies, MAX_ZOMBIES, zombies)
(nzombies, ngcs, avg_zombies, max_live, max_zombies, avg_live)
(Fgc_status, check_gcpros, relocatable_string_data_p, gc-precise):
* src/bytecode.c (mark_byte_stack) [BYTE_MARK_STACK]:
* src/eval.c (gcpro_level) [DEBUG_GCPRO]:
* src/lisp.h (struct handler.gcpro, struct gcpro, GC_MARK_STACK)
(GC_USE_GCPROS_AS_BEFORE, GC_MAKE_GCPROS_NOOPS)
(GC_MARK_STACK_CHECK_GCPROS, GC_USE_GCPROS_CHECK_ZOMBIES)
(BYTE_MARK_STACK, GCPRO1, GCPRO2, GCPRO3, GCPRO4, GCPRO5, GCPRO6)
(GCPRO7, UNGCPRO, RETURN_UNGCPRO):
Remove.  All uses removed.  The code now assumes
GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
* src/bytecode.c (relocate_byte_stack):
Rename from unmark_byte_stack, since it now only relocates.
All callers changed.
* src/frame.c (make_frame): Add an IF_LINT to pacify GCC 5.2
with GCPROs removed.
* src/systime.h: Use EMACS_LISP_H as the canary instead of GCPRO1.
* test/automated/finalizer-tests.el (finalizer-basic)
(finalizer-circular-reference, finalizer-cross-reference)
(finalizer-error):
* test/automated/generator-tests.el (cps-test-iter-close-finalizer):
Remove tests, as they depend on gc-precise.

* lisp/cedet/mode-local.el (xref-mode-local--override-present,
xref-mode-local-overload): New; add mode local overrides to
xref-find-definitions.

* test/automated/elisp-mode-tests.el: Add mode local override tests.
(xref-elisp-test-run): Handle indented defuns.
(xref-elisp-generic-*): Improve doc strings.

* lisp/progmodes/elisp-mode.el (elisp-xref-find-def-functions): New.
(elisp--xref-find-definitions): Use it.

* lisp/cedet/mode-local.el (describe-mode-local-overload): New; add mode
local overrides to describe-function.

* etc/NEWS: Document change.

These files are plain text and might be used by non-Emacs apps.
They’re mostly ASCII, so just use straight quotes.

That way, the caller doesn’t have to use curved quotes to
get diagnostics that match the text-quoting-style preferences.
Suggested by Dmitry Gutov in:
http://lists.gnu.org/archive/html/emacs-devel/2015-08/msg00893.html
This means we no longer need %qs, so remove that format.
While we’re at it, fix an unlikely bug and lessen the pressure
on the garbage collector by processing the string once rather
than twice in the usual case.
* doc/lispref/strings.texi (Formatting Strings):
* etc/NEWS: Document this.
* lisp/subr.el (format-message): Remove; now done in C.
* src/callint.c (Fcall_interactively):
* src/editfns.c (Fmessage, Fmessage_box):
Use Fformat_message instead of Finternal__text_restyle
followed by Fformat.
* src/doc.c (LSQM, RSQM): Remove; all uses changed to use
uLSQM and uRSQM.
(Fsubstitute_command_keys): Prefer AUTO_STRING to build_string
when pure ASCII now suffices.  Fix unlikely bug when parsing
unibyte string containing non-ASCII bytes.  Use inline code
rather than memcpy, as it’s a tiny number of bytes.
(Finternal__text_restyle): Remove; no longer used.
(syms_of_doc): Don’t declare it.
* src/editfns.c (Fformat): Rewrite in terms of new function
‘styled_format’.
(Fformat_message): New function, moved here from subr.el.
(styled_format): New function, with the old guts of Fformat,
except it now optionally transliterates quotes, and it transliterates
traditional grave accent and apostrophe quoting as well.
Remove recently-added q flag; no longer needed or used.
(syms_of_editfns): Define format-message.
* src/lisp.h (uLSQM0, uLSQM1, uLSQM2, uRSQM0, uRSQM1, uRSQM2):
Remove; no longer need to be global symbols.
* src/xdisp.c (vadd_to_log): Use Fformat_message, not Fformat,
so that callers can use `%s'.
* src/image.c (image_size_error, xbm_load_image, xbm_load)
(xpm_load, pbm_load, png_load_body, jpeg_load_body, tiff_load)
(gif_load, imagemagick_load_image, imagemagick_load, svg_load)
(svg_load_image, gs_load, x_kill_gs_process):
* src/lread.c (load_warn_old_style_backquotes):
* src/xfaces.c (load_pixmap):
* src/xselect.c (x_clipboard_manager_error_1):
Use `%s' instead of %qs in formats.

This is simpler and easier to explain, and should encourage better
typography.  Do this in Electric Quote mode and when translating
quotes in docstrings.  Inspired by a suggestion by Dmitry Gutov	in:
https://lists.gnu.org/archive/html/emacs-devel/2015-08/msg00806.html
* doc/emacs/text.texi (Quotation Marks):
* doc/lispref/help.texi (Keys in Documentation):
* etc/NEWS:
Document this.
* lisp/electric.el (electric-quote-post-self-insert-function):
* src/doc.c (Fsubstitute_command_keys):
Always treat ' like ’ even when not matched by an open quote.

Instead of restyling curved quotes for every call to ‘format’,
create a new function ‘format-message’ that does the restyling,
and using the new function instead of ‘format’ only in contexts
where this seems appropriate.
Problem reported by Dmitry Gutov and Andreas Schwab in:
http://lists.gnu.org/archive/html/emacs-devel/2015-08/msg00826.html
http://lists.gnu.org/archive/html/emacs-devel/2015-08/msg00827.html
* doc/lispref/commands.texi (Using Interactive):
* doc/lispref/control.texi (Signaling Errors, Signaling Errors):
* doc/lispref/display.texi (Displaying Messages, Progress):
* doc/lispref/elisp.texi:
* doc/lispref/help.texi (Keys in Documentation):
* doc/lispref/minibuf.texi (Minibuffer Misc):
* doc/lispref/strings.texi (Formatting Strings):
* etc/NEWS:
Document the changes.
* lisp/abbrev.el (expand-region-abbrevs):
* lisp/apropos.el (apropos-library):
* lisp/calc/calc-ext.el (calc-record-message)
(calc-user-function-list):
* lisp/calc/calc-help.el (calc-describe-key, calc-full-help):
* lisp/calc/calc-lang.el (math-read-big-balance):
* lisp/calc/calc-store.el (calc-edit-variable):
* lisp/calc/calc-units.el (math-build-units-table-buffer):
* lisp/calc/calc-yank.el (calc-edit-mode):
* lisp/calendar/icalendar.el (icalendar-export-region)
(icalendar--add-diary-entry):
* lisp/cedet/mode-local.el (mode-local-print-binding)
(mode-local-describe-bindings-2):
* lisp/cedet/semantic/complete.el (semantic-completion-message):
* lisp/cedet/semantic/edit.el (semantic-parse-changes-failed):
* lisp/cedet/semantic/wisent/comp.el (wisent-log):
* lisp/cedet/srecode/insert.el (srecode-insert-show-error-report):
* lisp/descr-text.el (describe-text-properties-1, describe-char):
* lisp/dframe.el (dframe-message):
* lisp/dired-aux.el (dired-query):
* lisp/emacs-lisp/byte-opt.el (byte-compile-log-lap-1):
* lisp/emacs-lisp/bytecomp.el (byte-compile-log)
(byte-compile-log-file, byte-compile-warn, byte-compile-form):
* lisp/emacs-lisp/cconv.el (cconv-convert, cconv--analyze-use)
(cconv-analyze-form):
* lisp/emacs-lisp/check-declare.el (check-declare-warn):
* lisp/emacs-lisp/checkdoc.el (checkdoc-this-string-valid-engine):
* lisp/emacs-lisp/cl-macs.el (cl-symbol-macrolet):
* lisp/emacs-lisp/edebug.el (edebug-format):
* lisp/emacs-lisp/eieio-core.el (eieio-oref):
* lisp/emacs-lisp/eldoc.el (eldoc-minibuffer-message)
(eldoc-message):
* lisp/emacs-lisp/elint.el (elint-file, elint-log):
* lisp/emacs-lisp/find-func.el (find-function-library):
* lisp/emacs-lisp/macroexp.el (macroexp--obsolete-warning):
* lisp/emacs-lisp/map-ynp.el (map-y-or-n-p):
* lisp/emacs-lisp/nadvice.el (advice--make-docstring):
* lisp/emacs-lisp/package.el (package-compute-transaction)
(package-install-button-action, package-delete-button-action)
(package-menu--list-to-prompt):
* lisp/emacs-lisp/timer.el (timer-event-handler):
* lisp/emacs-lisp/warnings.el (lwarn, warn):
* lisp/emulation/viper-cmd.el:
(viper-toggle-parse-sexp-ignore-comments)
(viper-kill-buffer, viper-brac-function):
* lisp/emulation/viper-macs.el (viper-record-kbd-macro):
* lisp/facemenu.el (facemenu-add-new-face):
* lisp/faces.el (face-documentation, read-face-name)
(face-read-string, read-face-font, describe-face):
* lisp/files.el (find-alternate-file, hack-local-variables)
(hack-one-local-variable--obsolete, write-file)
(basic-save-buffer, delete-directory):
* lisp/format.el (format-write-file, format-find-file)
(format-insert-file):
* lisp/help-fns.el (help-fns--key-bindings)
(help-fns--compiler-macro, help-fns--obsolete)
(help-fns--interactive-only, describe-function-1)
(describe-variable):
* lisp/help.el (describe-mode):
* lisp/info-xref.el (info-xref-output):
* lisp/info.el (Info-virtual-index-find-node)
(Info-virtual-index, info-apropos):
* lisp/international/kkc.el (kkc-error):
* lisp/international/mule-cmds.el:
(select-safe-coding-system-interactively)
(select-safe-coding-system, describe-input-method):
* lisp/international/mule-conf.el (code-offset):
* lisp/international/mule-diag.el (describe-character-set)
(list-input-methods-1):
* lisp/international/quail.el (quail-error):
* lisp/minibuffer.el (minibuffer-message):
* lisp/mpc.el (mpc--debug):
* lisp/msb.el (msb--choose-menu):
* lisp/net/ange-ftp.el (ange-ftp-message):
* lisp/net/gnutls.el (gnutls-message-maybe):
* lisp/net/newst-backend.el (newsticker--sentinel-work):
* lisp/net/newst-treeview.el (newsticker--treeview-load):
* lisp/net/nsm.el (nsm-query-user):
* lisp/net/rlogin.el (rlogin):
* lisp/net/soap-client.el (soap-warning):
* lisp/net/tramp.el (tramp-debug-message):
* lisp/nxml/nxml-outln.el (nxml-report-outline-error):
* lisp/nxml/nxml-parse.el (nxml-parse-error):
* lisp/nxml/rng-cmpct.el (rng-c-error):
* lisp/nxml/rng-match.el (rng-compile-error):
* lisp/nxml/rng-uri.el (rng-uri-error):
* lisp/obsolete/iswitchb.el (iswitchb-possible-new-buffer):
* lisp/org/org-ctags.el:
(org-ctags-ask-rebuild-tags-file-then-find-tag):
* lisp/proced.el (proced-log):
* lisp/progmodes/ebnf2ps.el (ebnf-log):
* lisp/progmodes/flymake.el (flymake-log):
* lisp/progmodes/vhdl-mode.el (vhdl-warning-when-idle):
* lisp/replace.el (occur-1):
* lisp/simple.el (execute-extended-command)
(undo-outer-limit-truncate, define-alternatives):
* lisp/startup.el (command-line):
* lisp/subr.el (error, user-error, add-to-list):
* lisp/tutorial.el (tutorial--describe-nonstandard-key)
(tutorial--find-changed-keys):
* src/callint.c (Fcall_interactively):
* src/editfns.c (Fmessage, Fmessage_box):
Restyle the quotes of format strings intended for use as a
diagnostic, when restyling seems appropriate.
* lisp/subr.el (format-message): New function.
* src/doc.c (Finternal__text_restyle): New function.
(syms_of_doc): Define it.

This reverts commit 244c801689d2f7a80480d83cd7d092d4762ebe08.