+++
** Building Emacs now requires C99 or later.
++++
** Building Emacs now requires GNU make, version 3.81 or later.
++++
** New configure option --with-cairo.
-Maybe add text based on http://lists.gnu.org/archive/html/emacs-devel/2015-05/msg00689.html
+This builds Emacs with Cairo drawing. As a side effect, it provides
+support for built-in printing, when Emacs was built with GTK+.
+** New configure option --with-modules.
+This enables support for loading dynamic modules; see below.
+
+---
** By default, Emacs no longer works on IRIX. We expect that Emacs
users are not affected by this, as SGI stopped supporting IRIX in
December 2013. If you are affected, please send a bug report. You
undumping code to GCC under IRIX, or by configuring --with-wide-int,
or by sticking with Emacs 24.4.
+---
** The Emacs garbage collector assumes GC_MARK_STACK == GC_MAKE_GCPROS_NOOPS.
The GC_MAKE_GCPROS_NOOPS stack-marking variant has been the default
since Emacs 24.4, and the other variants were undocumented and were
obstacles to maintenance and development. GC_MARK_STACK and its
related symbols have been removed from the C internals.
+---
** 'configure' now prefers gnustep-config when configuring GNUstep.
If gnustep-config is not available, the old heuristics are used.
This affects only the 'movemail' utility; Emacs itself can still
process MMDF-format files as before.
++++
** The configure option '--enable-silent-rules' is now the default,
and silent rules are now quieter. To get the old behavior where
'make' chatters a lot, configure with '--disable-silent-rules' or
It has no particular connection to Emacs and has not changed in years,
so if you want to use it, you can always take a copy from an older Emacs.
+---
** Emacs 25 comes with a new set of icons.
Various resolutions are available as etc/images/icons/hicolor/*/apps/emacs.png.
The old Emacs logo icons are available as `emacs23.png' in the same location.
\f
* Changes in Emacs 25.1
++++
+** Any file of the form .dir-locals*.el is now considered a dir-local
+file, and multiple such files can be used in the same directory. See
+the variable `dir-locals-file' for more information.
+
+---
** `xref-find-definitions' and `describe-function' now display
- information about mode local overrides (defined by
- cedet/mode-local.el `define-overloadable-function' and
- `define-mode-local-overrides').
+information about mode local overrides (defined by cedet/mode-local.el
+`define-overloadable-function' `define-mode-local-overrides').
-** New `display-buffer' action function `display-buffer-use-some-frame'
++++
+** New `display-buffer' action function `display-buffer-use-some-frame'.
This displays the buffer in an existing frame other than the current
frame, and allows the caller to specify a frame predicate to exclude
frames.
-** New doc command `describe-symbol'. Works for functions, vars, faces, etc...
-
-** New user option `search-default-regexp-mode' specifies the default mode for isearch
-
-** `isearch' and `query-replace' now perform character folding in matches.
-This is analogous to case-folding, but applies between Unicode
-characters and their ASCII counterparts. This means many characters
-will match entire groups of characters.
-
-For instance, the " will match all variants of unicode double quotes
-(like “ and ”), and the letter a will match all of its accented
-cousins, even those composed of multiple characters, as well as many
-other symbols like ℀, ℁, ⒜, and ⓐ.
-
-** New function `character-fold-to-regexp' can be used
-by searching commands to produce a regexp matching anything that
-character-folds into STRING.
-
-** New command `checkdoc-package-keywords' checks if the
-current package keywords are recognized. Set the new option
-`checkdoc-package-keywords-flag' to non-nil to make
-`checkdoc-current-buffer' call this function automatically.
-
-** New function `checkdoc-file' checks for style errors.
-It's meant for use together with `compile':
-emacs -batch --eval "(checkdoc-file \"subr.el\")"
-
-** New command `comment-line' bound to `C-x C-;'.
++++
+** New documentation command `describe-symbol'.
+Works for functions, variables, faces, etc. It is bound to `C-h o' by
+default.
** New function `custom-prompt-customize-unsaved-options' checks for
unsaved customizations and prompts user to customize (if found).
** C-h l now also lists the commands that were run.
----
-** The new M-s M-w key binding uses eww to search the web for the
-text in the region.
-
** M-x suggests shorthands and ignores obsolete commands for completion.
** x-select-enable-clipboard is renamed select-enable-clipboard.
x-select-enable-primary and renamed select-enable-primary.
which specifies an alternative printing method which is faster when
few or no entries have changed.
+** Emacs can now load shared/dynamic libraries (modules).
+A dynamic Emacs module is a shared library that provides additional
+functionality for use in Emacs Lisp programs, just like a package
+written in Emacs Lisp would. The functions `load', `require',
+`load-file', etc. were extended to load such modules, as they do with
+Emacs Lisp packages. The new variable `module-file-suffix' holds the
+system-dependent value of the file-name extension (`.so' on Posix
+hosts) of the module files.
+
+A module should export a C-callable function named
+`emacs_module_init', which Emacs will call as part of the call to
+`load' or `require' which loads the module. It should also export a
+symbol named `plugin_is_GPL_compatible' to indicate that its code is
+released under the GPL or compatible license; Emacs will refuse to
+load modules that don't export such a symbol.
+
+If a module needs to call Emacs functions, it should do so through the
+API defined and documented in the header file `emacs-module.h'. Note
+that any module that provides Lisp-callable functions will have to use
+Emacs functions such as `fset' and `funcall', in order to register its
+functions with the Emacs Lisp interpreter.
+
+Modules can create `user-ptr' Lisp objects that embed pointers to C
+struct's defined by the module. This is useful for keeping around
+complex data structures created by a module, to be passed back to the
+module's functions. User-ptr objects can also have associated
+"finalizers" -- functions to be run when the object is GC'ed; this is
+useful for freeing any resources allocated for the underlying data
+structure, such as memory, open file descriptors, etc. A new
+predicate `user-ptr-p' returns non-nil if its argument is a `usr-ptr'
+object.
+
+Loadable modules in Emacs are an experimental feature, and subject to
+change in future releases. For that reason, their support is disabled
+by default, and must be enabled by using the `--with-modules' option
+at configure time.
+
+** New input method: `tamil-dvorak'.
+
\f
* Editing Changes in Emacs 25.1
** Successive single-char deletions are collapsed in the undo-log just like
successive char insertions.
++++
+** New command `comment-line' bound to `C-x C-;'.
+
** Unicode names entered via C-x 8 RET now use substring completion by default.
** C-x 8 now has shorthands for these chars: ‐ ‑ ‒ – — ― ‘ ’ “ ” † ‡ • ′ ″
\f
* Changes in Specialized Modes and Packages in Emacs 25.1
+** Checkdoc
+
++++
+*** New command `checkdoc-package-keywords' checks if the
+current package keywords are recognized. Set the new option
+`checkdoc-package-keywords-flag' to non-nil to make
+`checkdoc-current-buffer' call this function automatically.
+
++++
+*** New function `checkdoc-file' checks for style errors.
+It's meant for use together with `compile':
+emacs -batch --eval "(checkdoc-file \"subr.el\")"
+
+** New function `bookmark-set-no-overwrite' bound to C-x r M.
+It raises an error if a bookmark of that name already exists,
+unlike `bookmark-set' which silently updates an existing bookmark.
+
** JSON
---
*** `json-pretty-print' and `json-pretty-print-buffer' now maintain
the ordering of object keys by default.
+---
+*** New commands `json-pretty-print-ordered' and
+`json-pretty-print-buffer-ordered' pretty prints JSON objects with
+object keys sorted alphabetically.
** You can recompute the VC state of a file buffer with `M-x vc-refresh-state'
** Prog mode has some support for multi-mode indentation.
** Search and Replace
++++
+*** New user option `search-default-regexp-mode'
+specifies the default mode for I-search.
+
++++
+*** `isearch' and `query-replace' can now perform character folding in matches.
+Isearch does that by default, while `query-replace' will do that if
+the new variable `replace-character-fold' is customized to a non-nil
+value. This is analogous to case folding, but instead of disregarding
+case variants, it disregards wider classes of distinctions between
+similar characters. (Case folding is a special case of character
+folding.) This means many characters in the search string will match
+entire groups of characters instead of just themselves.
+
+For instance, the " will match all variants of double quotes (like “
+and ”), and the letter a will match all of its accented cousins, even
+those composed of multiple characters, as well as many other symbols
+like ℀, ℁, ⒜, and ⓐ.
+
++++
+*** New function `character-fold-to-regexp' can be used
+by searching commands to produce a regexp matching anything that
+character-folds into STRING.
+
++++
+*** The new M-s M-w key binding uses eww to search the web for the
+text in the region. The search engine to use for this is specified by
+the customizable variable `eww-search-prefix'.
+
++++
*** Query-replace history is enhanced.
When query-replace reads the FROM string from the minibuffer, typing
`M-p' will now show previous replacements as "FROM SEP TO", where FROM
allow overriding the regular expression that recognizes the ldapsearch
command line's password prompt.
+EUDC's BBDB backend now supports BBDB 3.
+
** Eshell
+++
** The `thunk' library provides functions and macros to control the
evaluation of forms.
+** js-jsx-mode (a minor variant of js-mode) provides indentation
+support for JSX, an XML-like syntax extension to ECMAScript.
+
\f
* Incompatible Lisp Changes in Emacs 25.1
+---
+** `setq' and `setf' must now be called with an even number of
+arguments. The earlier behavior of silently supplying a nil to the
+last variable when there was an odd number of arguments has been
+eliminated.
+
** `syntax-begin-function' is declared obsolete.
Removed font-lock-beginning-of-syntax-function and the SYNTAX-BEGIN
slot in font-lock-defaults.