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* README:
* configure.ac:
* etc/NEWS:
* msdos/sed2v2.inp: Increment the Emacs version to 25.2.50.

* lisp/ibuffer.el (ibuffer-do-view-1):
When TYPE equals 'other-frame, then display each buffer
in a new frame (Bug#24086).

This incorporates:
2016-09-22 stdint: port to GCC 7
2016-09-22 limits-h, stdint: don't assume extensions
* doc/misc/texinfo.tex, m4/limits-h.m4, m4/stdint.m4: Copy from gnulib.

The NetBSD library supports localtime_rz directly, and without
this change 'configure' omitted the flexmember test that is marked
as conditional on localtime_rz.  Emacs now needs to use
flexmember.m4 even when localtime_rz works.
Problem reported by Thomas Klausner.
* admin/merge-gnulib (GNULIB_MODULES): Add flexmember.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.

This removes a workaround where Emacs did not use flexible
array members when compiled with IBM XL C.  Instead, avoid
the problem by making the aliasing issues more obvious to
this compiler.
* admin/merge-gnulib: Don’t remove m4/flexmember.m4.
* m4/flexmember.m4: Copy from gnulib.
* configure.ac (AC_C_FLEXIBLE_ARRAY_MEMBER): Remove workaround.
* src/alloc.c (allocate_string_data): Rephrase to avoid aliasing
problem that would otherwise mess up code generated for flexible
array members by IBM XL C for AIX, V12.1.
* src/conf_post.h (FLEXIBLE_ARRAY_MEMBER): Remove; now done
by gnulib code.

* lisp/net/tramp-sh.el (tramp-sh-handle-expand-file-name): Don't use
`tramp-drop-volume-letter' any longer, it causes collateral
damages.  Reported by Chris Zheng <chriszheng99@gmail.com>.

* src/vm-limit.c (__MALLOC_HOOK_VOLATILE, __morecore)
(__after_morecore_hook):
* src/ralloc.c (__morecore):
Declare if DOUG_LEA_MALLOC is not defined, not if HAVE_MALLOC_H is
not defined.  <malloc.h> does not declare these in AIX 7.1.

Problem reported by Richard Copley in:
http://lists.gnu.org/archive/html/emacs-devel/2016-09/msg00440.html
* src/w32.c, src/w32notify.c, src/w32proc.c (_GNU_SOURCE):
Define early.

* test/manual/BidiCharacterTest.txt: Import the version from
Unicode Standard 9.0.0.
* test/manual/biditest.el (biditest-generate-testfile): Allow 'x'
in the 4th field of the test data.

* lisp/ibuffer.el (ibuffer-do-toggle-read-only): Call
'read-only-mode' with ARG when its an integer.
Clarify the meaning of ARG in doc string.

* lisp/emacs-lisp/bytecomp.el (byte-compile-set-symbol-position): ensure new
value of byte-compile-last-position is not lower than old value.
(byte-compile-function-warn): call byte-compile-set-symbol-position.

* lisp/net/tramp.el (tramp-get-buffer): Reuse connection
property "process-buffer" if already existing.
(tramp-connectable-p): Suppress debug messages.

Problem reported by Bob Halley in:
http://lists.gnu.org/archive/html/emacs-devel/2016-09/msg00427.html
* src/unexmacosx.c (_GNU_SOURCE): Define if not already defined.

This happened with a macro invocation which was followed by a statement block
in braces.

* lisp/progmodes/cc-engine.el (c-forward-decl-or-cast-1): CASE 11: distinguish
between contexts nil and top, being less permissive in the former case.
(c-just-after-func-arglist-p): call c-forward-decl-or-cast-1 with context top.

* src/editfns.c (Fformat): Fix ambiguity in the doc string's usage
of a literal period.  (Bug#24407)

* lisp/whitespace.el (whitespace-mode, whitespace-newline-mode)
(global-whitespace-mode, global-whitespace-newline-mode): Improve
the doc strings.  (Bug#24413)

* lisp/simple.el (next-line, previous-line): Mention
'next-logical-line' and 'previous-logical-line' in the doc
strings.  (Bug#24443)

This incorporates:
2016-09-16 extensions: fix typo in comment
2016-09-16 stdio: don't redefine __USE_MINGW_ANSI_STDIO
* m4/extensions.m4, m4/stdio_h.m4: Copy from gnulib.

* src/data.c (ULL_WIDTH):
* src/lisp.h (EMACS_INT_WIDTH, BITS_PER_BITS_WORD):
* src/lread.c (read_integer):
* src/term.c (produce_glyphless_glyph):
* src/xterm.c (x_send_scroll_bar_event):
Use *_WIDTH macros instead of CHAR_BIT * sizeof.
* src/data.c (ULL_WIDTH): Rename from BITS_PER_ULL for consistency
with the *_WIDTH standard macros.  All uses changed.
* src/gmalloc.c (INT_BIT): Remove.  All uses replaced with INT_WIDTH.
* src/lisp.h (EMACS_INT_WIDTH): Rename from BITS_PER_EMACS_INT
for consistency with the *_WIDTH standard macros.  All uses changed.
(BITS_PER_CHAR): Remove; all uses replaced by CHAR_BIT.  This must
be the same as CHAR_WIDTH and avoids confusion with Elisp
char-width, which counts columns not bits.
(BITS_PER_SHORT): Remove; all uses replaced by SHRT_WIDTH.
(BITS_PER_LONG): Remove; all uses replaced by LONG_WIDTH.
* src/lread.c: Do not include limits.h since CHAR_BIT is no longer
used directly.

This incorporates:
2016-09-15 stdint: support new _WIDTH macros
2016-09-15 limits-h: new module
2016-09-15 sys_types: avoid glibc 2.25 warnings about major()
2016-09-15 extensions: port to more ISO C TSes
2016-09-13 intprops: new macro TYPE_WIDTH
2016-09-13 extensions: port to recent ISO C TRs
* .gitignore: Add lib/limits.h.
* doc/misc/texinfo.tex, lib/ftoastr.h, lib/intprops.h:
* lib/stdint.in.h, m4/extensions.m4, m4/stdint.m4, m4/stdio_h.m4:
* m4/sys_types_h.m4: Copy from gnulib.
* lib/gnulib.mk, m4/gnulib-comp.m4: Regenerate.
* lib/limits.in.h, m4/limits-h.m4: New files, copie from gnulib.
* nt/gnulib.mk: Merge changes from lib/gnulib.mk.

* lisp/net/tramp.el (tramp-get-buffer): Set connection property
"process-buffer" in order to mark connection as active.

* lisp/net/tramp-cache.el (tramp-get-hash-table)
(tramp-set-connection-property)
(tramp-dump-connection-properties): Do not use "active" property.
(tramp-list-connections): Use "process-buffer" property.

* lisp/net/tramp-cmds.el (tramp-cleanup-connection): Flush process
properties prior deletion of process.

* src/fileio.c (clone_file): Condition on !WINDOWSNT, since the
call to it is not compiled in that build, and having it defined
causes compiler warnings.

* src/lisp.h:
* src/print.c (Fprin1_to_string):
* src/eval.c (signal_or_quit):
* src/alloc.c (garbage_collect_1): Remove declarations, setting,
and testing the value of abort_on_gc.  It is no longer needed, and
using it causes rare aborts in GC for no good reason.  (Bug#23912)

* lisp/net/tramp-cache.el (tramp-get-hash-table): Initialize a
connection as inactive.
(tramp-set-connection-property): Make the connection active.
(tramp-dump-connection-properties): Don't save "active" property.
(tramp-list-connections): List only active connections.  (Bug#24432)

* lisp/net/shr.el (shr-expand-url): Don't bug out on
degenerate all-whitespace URLs.

* lisp/net/sieve-manage.el (sieve-manage-ignore-starttls):
Rename from sieve-manage-ignore-broken-tls.  If it is set,
sieve-manage will never use STARTTLS even if the server says
it is capable (but may be broken).

* src/character.h (CHARACTER_WIDTH): Rename from CHAR_WIDTH.
All uses changed.

Command dired-goto-file requires its argument to be an absolute
file name.  Interactively FILE-NAME is read with read-file-name,
which could return an abbreviated file name (Bug#24409).
* lisp/dired-x.el (dired-jump): Use expand-file-name on FILE-NAME.
Clarify in doc string the meaning of arg FILE-NAME.

* test/lisp/legacy/files-tests.el (files-test-bug-21454): New test.

* lisp/net/sieve.el (sieve-edit-script):
Make the buffer to edit be not modified-p initially (bug#24423).

* lisp/net/sieve-manage.el
(sieve-manage-ignore-broken-tls): New user option.
(sieve-manage-open-server):
Don't test STARTTLS capability if the option is set (bug#24422).

This fixes the following warning:

	frame.c: In function ‘x_set_frame_parameters’:
	frame.c:3329:25: error: ‘width’ may be used uninitialized in
		this function [-Werror=maybe-uninitialized]
	       adjust_frame_size (f, width_change ? width : -1,
                         ^

* src/frame.c (x_set_frame_parameters): Drop width_changed and
height_changed variables in favour of storing that information in
width and height variables.