path: root/ChangeLog

2023-05-21  Jim Meyering  <meyering@meta.com>

	version 3.10
	* NEWS: Record release date.

2023-05-21  Jim Meyering  <meyering@fb.com>

	build: skip the sole perl-requiring test when there is no usable perl
	* tests/init.cfg (require_perl_): New function, from coreutils.
	* tests/large-subopt: Use it.
	Reported by Bruno Haible in
	https://lists.gnu.org/r/diffutils-devel/2023-05/msg00003.html

2023-05-20  Jim Meyering  <meyering@fb.com>

	build: fix a new syntax-check failure
	* src/diff.h (robust_output_style): Put DIFF_INLINE and
	the function name on the same line, so that syntax-check's
	naive parsing can spot this function.
	* cfg.mk (_gl_TS_extern): Add DIFF_INLINE.

	build: modernize bootstrap prerequsite tools
	Following Pádraig Brady's example from coreutils, ...
	* bootstrap.conf: Add an explicit requirement on m4.
	Add an explicit requirement on texi2pdf which is often packaged
	separately to makeinfo and induces a failure far down the
	distribution phase if not present.
	Replace the rsync dependency with wget,
	which gnulib changed to in 2018.
	Also, add an xz requirement and a version for autopoint.

2023-05-19  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest
	* src/analyze.c (OFFSET_MAX): New macro, needed for
	latest gnulib.

	diff: avoid a macro in diff.h
	* src/diff.h (FILE_BUFFER): Remove.
	* src/io.c (file_buffer): New static function.  All uses of
	FILE_BUFFER replaced.

	sdiff: avoid some macros in sdiff.c
	* src/sdiff.c (PROGRAM_NAME, SDIFF_BUFSIZE):
	Now constants, not macros.

	diff3: avoid macros in diff3.c
	* src/diff3.c (PROGRAM_NAME, FILE0, FILE1, FILE2, FILE3, FO, FC)
	(RANGE_START, RANGE_END): Now constants, not macros.

	cmp: avoid macros in cmp.c
	* src/cmp.c (PROGRAM_NAME): Now a constant, not a macro.
	(hard_locale_LC_MESSAGES): Now a function, not a macro.
	All uses changed.

	diff: avoid macros in diff.c
	* src/diff.c (PROGRAM_NAME, NONEXISTENT, UNOPENED):
	Now constants, not macros.
	(errno_encode, errno_decode): Now functions, rather than
	macros ERRNO_ENCODE and ERRNO_DECODE.  All uses changed.

	diff: use function for robust_output_style
	* bootstrap.conf (gnulib_modules): Add extern-inline.
	* src/diff.h: Use _GL_INLINE_HEADER_BEGIN and _GL_INLINE_HEADER_END.
	(DIFF_INLINE): New macro.
	(robust_output_style): Now an inline function, not a macro
	ROBUST_OUTPUT_STYLE.  All uses changed.

	cmp: don’t give up if fstat fails
	* src/cmp.c (main, cmp): If fstat fails, simply record the failure
	and move on, instead of exiting.  Modify other uses of the struct
	stat to do something reasonable if the status is missing.

	diff3: don’t give up if fstat fails
	* src/diff3.c (read_diff): Work even if fstat fails,
	e.g., due to EOVERFLOW.

	diff3: fix race condition involving directories
	This fixes a TOC-TOU race with "diff3 A B C" when one
	of its arguments is a directory.
	* src/diff.c (no_directory): New static var.
	(NO_DIRECTORY_OPTION): New constant.
	(longopts): Add ---no-directory.
	(main): Support it.
	(compare_files): If ---no-directory is given, do not treat
	directories specially.
	* src/diff3.c (main): Do not check whether an argument is
	a directory.
	(read_diff): Pass ---no-directory to diff, so that it checks.

2023-05-13  Jim Meyering  <meyering@fb.com>

	maint: suppress new test's doubled-word syntax-check failure
	* cfg.mk (exclude_file_name_regexp--sc_prohibit_doubled_word):
	Exempt the new test's use of "in in".

2023-05-13  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2023-05-13  Carlo Marcelo Arenas Belón  <carenas@gmail.com>  (tiny change)

	gnulib: fix Y2038 bug (again)
	AC_SYS_LARGEFILE meaning has changed, need AC_SYS_YEAR2038 as well

	* NEWS: mention this
	* tests: add test
	* bootstrap.conf: add year2038

2023-02-24  Paul Eggert  <eggert@cs.ucla.edu>

	maint: add 'diff --git' TODO
	* TODO: Suggest better compatibility with 'git diff -p'.
	From a suggestion by Linus Torvalds
	<https://lkml.org/lkml/2023/2/24/797>.

2023-02-10  Paul Eggert  <eggert@cs.ucla.edu>

	maint: update .gitignore
	.gitignore: Update for some recent changes, and simplify.

	diff: fix bug where -D does not work
	Problem reported by Robert Webb (bug#61193).
	* NEWS: Mention this.
	* src/diff.c (main): Omit stray ‘sizeof’.
	* tests/ifdef: New test.
	* tests/Makefile.am (TESTS): Add it.

2023-02-07  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2023-02-05  Paul Eggert  <eggert@cs.ucla.edu>

	diff: use C23 bool
	* bootstrap.conf (gnulib_modules): Add stdbool.
	* src/die.h, src/system.h: Do not include <stdbool.h>.

	diff: prefer nullptr to NULL
	* bootstrap.conf (gnulib_modules): Add c-nullptr.
	* src/cmp.c (main):
	* src/context.c (pr_context_hunk, pr_unidiff_hunk)
	(mark_ignorable, find_function):
	* src/diff.c (longopts, main, specify_value, specify_style)
	(specify_colors_style, compare_files):
	* src/diff3.c (main, process_diff):
	* src/dir.c (find_dir_file_pathname):
	* src/ifdef.c (scan_char_literal):
	* src/sdiff.c (main):
	* src/util.c (process_signals, install_signal_handlers)
	(color_ext_list, color_indicator, indicator_name)
	(parse_diff_color):
	Prefer C23-style nullptr to NULL, as nullptr is a bit better.

	doc: update README-hacking
	* README-hacking: Update for current bootstrap.

	maint: sync bootstrap from Gnulib
	bootstrap: sync from Gnulib

	build: update gnulib submodule to latest
	* lib/sh-quote.c.diff: Remove, as Gnulib now has this.

	build: add libraries
	* src/Makefile.am (LDADD, sdiff_LDADD): Add Gnulib libraries that
	in theory would be needed on unusual platforms.  In practice,
	these are typicall empty or are duplicates of other library
	arguments and so are redundant.

2023-02-04  Jim Meyering  <meyering@fb.com>

	doc: update HACKING
	* HACKING: Update from grep's HACKING.

2023-02-04  Jim Meyering  <meyering@meta.com>

	maint: prefer https: to git:
	The idea is to defend against some adversary-in-the-middle attacks.
	Also prefer git.savannah.gnu.org over its shorter alias, git.sv.gnu.org
	to avoid a warning e.g., from git clone.
	Also, drop any final ".git" suffix on the resulting URIs.
	Inspired by Paul Eggert's nearly identical changes to coreutils.

2023-01-16  Jim Meyering  <meyering@fb.com>

	tests: accommodate newer GNU make's SIGPIPE-ignore
	* tests/colors: Allow an exit code of not just 141 (SIGPIPE),
	but also "error": 2.
	Reported by Tomasz Kłoczko in http://bugs.gnu.org/59905.

2023-01-15  Jim Meyering  <meyering@meta.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.9
	* NEWS: Record release date.

	build: update gnulib to latest

2023-01-05  Jim Meyering  <meyering@fb.com>

	tests: avoid large-subopt XPASS on systems without perl
	* tests/large-subopt: Use $PERL, rather than hard-coding "perl".
	* bootstrap.conf (gnulib_modules): Add "perl" to the list.
	Reported by Bruno Haible in
	https://lists.gnu.org/r/diffutils-devel/2023-01/msg00000.html

2023-01-05  Bruno Haible  <bruno@clisp.org>

	tests: avoid a test failure when using Solaris 11.4's old grep
	* tests/colors (nanosecond_zeros): Use a dumbed-down grep '\.'
	in place of "grep -F ." to accommodate Solaris 11.4's old versions
	of grep in the default PATH. Reported here:
	https://lists.gnu.org/r/diffutils-devel/2023-01/msg00001.html

2023-01-01  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

	maint: update copyright dates

2022-12-31  Paul Eggert  <eggert@cs.ucla.edu>

	build: simplify GCC 12 false alarm workaround
	* src/util.c (print_message_queue): Pacify GCC in a
	more-straightforward way.

	maint: fix assumption typo
	Fix a typo I introduced in my August 2021 signal handling fixes.
	Problem reported by Sam James (Bug#60457).
	* src/util.c (xsigismember): Don’t assume sigismember cannot return 0.

2022-12-30  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

	build: temp?-disable -Wanalyzer-use-of-uninitialized-value
	* src/util.c (print_message_queue): This function triggers false
	positive warnings from GCC12, so add pragmas to ignore that new warning
	in this one function. Required when using either of these:
	- gcc version 12.2.1 20221121
	- gcc version 13.0.0 20221229 (experimental)

2022-12-11  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2022-11-12  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

2022-02-14  Paul Eggert  <eggert@cs.ucla.edu>

	doc: mark up SEE ALSO (Bug#53976)

2022-01-24  Jim Meyering  <meyering@fb.com>

	tests: fix false-failure on systems without valgrind
	* tests/init.cfg (require_valgrind_): Use exit status of subshell,
	not that of the "local" declaration.

2022-01-14  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2022-01-03  Jim Meyering  <meyering@fb.com>

	maint: avoid new syntax-check failure
	* cfg.mk (local-checks-to-skip): Add sc_indent, to skip it.
	Otherwise, "make syntax-check" would fail.

	maint: make update-copyright

	build: update gnulib to latest; also bootstrap and init.sh

2021-10-30  Paul Eggert  <eggert@cs.ucla.edu>

	maint: modernize README-{hacking,prereq}

2021-10-16  Paul Eggert  <eggert@cs.ucla.edu>

	doc: copy fdl.texi into git
	This pacifies this notice from ./bootstrap: “Notice from module
	fdl: Don't use this module! Instead, copy the referenced license
	file into your version control repository.”
	* bootstrap.conf (gnulib_modules): Remove fdl.
	* doc/fdl.texi: New file, taken from Gnulib.

	maint: direct dependency on time_rz now
	Now that diff calls tzalloc, it depends directly on time_rz.
	* bootstrap.conf (gnulib_modules): Add time_rz.

	build: update gnulib submodule to latest

2021-10-15  Paul Eggert  <eggert@cs.ucla.edu>

	diff: fix timezone bug on Solaris
	Problem reported by Vladimir Marek (bug#51228).
	* NEWS: Mention this.
	* src/context.c (print_context_label): Pass localtz to nstrftime,
	instead of always passing 0.
	* src/diff.c (main) [!HAVE_TM_GMTOFF]:
	Initialize localtz if time_format uses %z.
	* src/diff.h (localtz): New decl.
	* tests/Makefile.am (TESTS): Add timezone.
	* tests/timezone: New test.

2021-08-31  Paul Eggert  <eggert@cs.ucla.edu>

	diff3: port better to MS-Windows
	* src/diff3.c (enum diff_type): Prefix constants like ADD with
	"DIFF_" to avoid collisions with unwise system headers.

2021-08-30  Paul Eggert  <eggert@cs.ucla.edu>

	maint: port better to non-POSIX
	Problem privately reported by Gisle Vanem for MS-Windows.
	* src/util.c (sig, install_signal_handlers):
	Don’t assume SIGTSTP, SIGALRM, SIGQUIT.
	(is_tstp_index): New function, for use in SIGTSTP avoidance.

	maint: prefer attribute.h attributes
	Prefer the macros used in attribute.h, and _Noreturn,
	to the by-hand use of __attribute__, as this is more portable.
	* bootstrap.conf (gnulib_modules): Add attribute.
	* src/system.h: Include attribute.h.  All uses of
	attributes changed to use the attribute.h macros.
	Plus, use _Noreturn.
	(FALLTHROUGH): Remove; attribute.h now defines this.

	build: update gnulib submodule to latest

	diff: avoid double translation
	* src/analyze.c (briefly_report): Do not translate here,
	as ‘message’ translates its format.

	diff: use variable arg list for messages
	This simplifies the code by using varargs.
	* bootstrap.conf (gnulib_modules): Add flexmember.
	(XGETTEXT_OPTIONS): Do not flag message5.
	* src/util.c: Include flexmember.h, stdarg.h.
	(struct msg): New members msgid, argbytes.  args is now
	FLEXIBLE_ARRAY_MEMBER, and does not contain msgid.
	All uses changed.
	(message): Now varargs.  Detect number of args by counting '%'s.
	Use FLEXSIZEOF, to avoid problems on systems with buggy
	allocators.  Avoid redundant ‘*p = 0’ when *p is already zero
	after stpcpy.
	(message5): Remove; all callers changed to use ‘message’.
	(print_message_queue): Abort if too many args were passed;
	this cannot happen with current diffutils.

2021-08-29  Paul Eggert  <eggert@cs.ucla.edu>

	diff: port better to MS-Windows
	Problem reported by Gisle Vanem (Bug#36488#30).
	* src/util.c (xsigaction) [SA_NOCLDSTOP]: Remove; no longer needed.
	(install_signal_handlers): If the first call to sigaction or
	signal fails, do not exit; just skip the signal and continue,
	in case the runtime does not support the signal even though the
	corresponding SIG* macro is defined.

2021-08-28  Paul Eggert  <eggert@cs.ucla.edu>

	diff: cleanup signal handling just before exit
	This should fix an unlikely signal handling bug with colored
	output, and should also fix a Debian FTBFS (Fails To Build From
	Source) on powerpc64le-linux.  See Bug#34519 and Frédéric
	Bonnard’s report in:
	https://bugs.debian.org/922552#19
	* bootstrap.conf (gnulib_modules): Add raise, sigprocmask.
	* src/diff.c (main): Call cleanup_signal_handlers before exiting.
	Don’t bother calling ‘exit’; no longer needed nowadays.
	* src/util.c (sigprocmask, siginterrupt) [!SA_NOCLDSTOP]:
	Define to 0 instead of empty, since the results are now used.
	(sigset_t) [!SA_NOCLDSTOP]: Remove; we now rely on Gnulib.
	(xsigaction) [SA_NOCLDSTOP]: New function.
	(xsigaddset, xsigismember, xsignal, xsigprocmask): New functions.
	(some_signals_caught): New static var.
	(process_signals): Omit a conditional branch.
	Don’t bother loading interrupt_signal if stop_signal_count is nonzero.
	(process_signals, install_signal_handlers):
	Check for failures from sigprocmask etc.
	(sig, nsig): Now at top level, since multiple functions need them.
	(install_signal_handlers): No need for caught_sig array;
	just use caught_signals.  However, set some_signals_caught.
	(cleanup_signal_handlers): New function.

2021-08-22  Paul Eggert  <eggert@cs.ucla.edu>

	diff: add integer overflow checking
	* src/diff.c (option_list, main): Check for integer overflow
	in some unlikely and hard-to-test cases.

	maint: refactor integer overflow checking
	Rely on more-modern Gnulib capabilities instead of doing
	integer overflow checking by hand, in some cases.
	* lib/cmpbuf.c (buffer_lcm):
	* src/io.c (slurp, find_identical_ends):
	Use INT_ADD_WRAPV and INT_MULTIPLY_WRAPV rather than checking
	overflow by hand.
	* src/diff3.c (process_diff):
	* src/dir.c (dir_read):
	* src/io.c (find_identical_ends, read_files):
	Use xnmalloc rather than checking overflow by hand.
	(read_files): Rely on xcalloc to do overflow checking.

	diff: avoid sprintf %s
	sprintf fails if the result contains more than INT_MAX bytes,
	so rework the code to avoid usage of sprintf %s where the
	string might be longer than that.
	* bootstrap.conf (gnulib_modules): Remove xvasprintf.
	* src/diff.c (specify_style):
	* src/util.c (begin_output):
	Rewrite to avoid sprintf %s.
	* src/util.c: Do not include xvasprintf.h.
	(concat): Remove, as it uses sprintf %s.  All uses rewritten.

	diff: use mempcpy
	* bootstrap.conf (gnulib_modules): Add mempcpy, stpcpy.
	* src/ifdef.c (do_printf_spec):
	* src/sdiff.c (expand_name, lf_snarf, temporary_file):
	* src/util.c (message5):
	Prefer mempcpy to memcpy plus manual size-updating.
	Prefer stpcpy to mempcpy plus manual size-spec.

	sdiff: fix unlikely memory leak
	* src/sdiff.c (temporary_file): Fix memory leak when mkstemp fails.
	Don’t assume temporary file name length fits in ‘int’.

	diff3: simplify process_diff
	* src/diff3.c (process_diff): Remove LAST_BLOCK arg, since callers
	no longer needed it.  All callers changed.  This removes an
	unnecessary initialization of bptr to NULL.

	maint: modernize IF_LINT for GCC 11.2.1
	* src/cmp.c (cmp):
	* src/dir.c (find_dir_file_pathname):
	* src/sdiff.c (edit):
	Mention which GCC bug this IF_LINT works around.
	* src/diff3.c (process_diff):
	Always initialize to NULL, to avoid problems on mostly-theoretical
	hosts where accessing uninitialized variables traps.  The next
	patch will have a better fix for this.
	* src/ifdef.c (do_printf_spec):
	No need for IF_LINT in GCC 11.2.1.

	maint: lint → GCC_LINT
	‘lint’ is for traditional lint and perhaps some other tools;
	‘GCC_LINT’ is targeted more for what we do.
	Gnulib accepts either, but we might as well be more accurate.
	* configure.ac (GCC_LINT): Define this instead of ‘lint’.
	All uses changed.

	diff: remove printint
	* src/system.h (printint): Remove.  All uses removed.  This type
	was only for porting to pre-C89 hosts, and is no longer needed.

	diff: remove INT_MAX limit on -F/-p searches
	* src/context.c (find_function): Don’t limit function-line
	searches to INT_MAX bytes, removing a FIXME.

	maint: .gitignore updates
	* .gitignore: Remove lib/unused-parameter.h.  Add all of m4, since
	no files there need to be committed; this lets us remove
	m4/.gitignore and m4/gnulib-cache.m4.  Add *.orig, *.patch, .Tpo,
	/*.diff, lib/*/ (which lets us remove /lib/sys/), lib/ctype.h,
	lib/errno.h, lib/float.h, lib/fnmatch.h, lib/getopt-cdefs.h,
	lib/getopt.h, lib/limits.h, lib/sigsegv.h, lib/stdalign.h,
	lib/stdarg.h, lib/stdbool.h, lib/stddef.h, lib/stdint.h,
	lib/stdopen.[ch], vc-dwim-log-*.  Add slashes to autom4te.cache,
	build-aux.  Remove redundant initial slashes from patterns that
	also have internal slashes.  Remove plain ABOUT-NLS, since
	/ABOUT-NLS suffices.  Sort using LC_ALL=C.

	maint: omit unused function if not debugging
	* src/util.c (debug_script): Compile only if DEBUG.

	maint: remove prepargs
	* lib/Makefile.am (noinst_HEADERS): Remove prepargs.h.
	(libdiffutils_a_SOURCES): Remove prepargs.c.
	* lib/prepargs.c, lib/prepargs.h: Remove.  Hasn’t been
	needed for many years.
	* src/diff.c: Do not include prepargs.h.

	maint: zalloc → xzalloc
	* src/util.c (zalloc): Remove.  All uses replaced
	by xzalloc, which means the same thing.

2021-08-22  Paul Eggert  <eggert@cs.ucla.edu>

	diff3: suppress -fanalyzer alarms
	* src/diff3.c: Add pragma to suppress -Wanalyzer-null-dereference
	alarms.

	* src/diff.h (find_dir_file_pathname): Add malloc-related
	attributes, to pacify gcc -Wsuggest-attribute=malloc.

2021-08-22  Paul Eggert  <eggert@cs.ucla.edu>

	maint: remove January workaround for Gnulib issue
	* configure.ac: Don’t add -Wno-analyzer-null-argument, since
	the issue is now fixed in Gnulib.

	build: update gnulib submodule to latest

2021-08-01  Paul Eggert  <eggert@cs.ucla.edu>

	maint: remove stray init.cfg
	* init.cfg: Remove.  I guess this file was a stray, since it was a
	copy of tests/init.cfg when it was checked in, and it hasn’t been
	maintained since.

	tests: port to valgrind 3.16.0 + GCC 11.2
	* tests/init.cfg (stderr_fileno_): Reject valgrind if it reports a
	"Serious error" on a trival use of ‘diff’.  Without this patch, on
	RHEL 8.4 when I compile diffutils with a GCC 11.2.0 that I built
	myself, ‘valgrind diff’ spits out messages like WARNING: Serious
	error when reading debug info / When reading debug info from diff:
	Ignoring non-Dwarf2/3/4 block in .debug_info’ and this causes the
	strip-trailing-cr test to fail.  I guess valgrind complains
	because the valgrind version 3.16.0 that came with RHEL 8.4 cannot
	grok the debug entries generated by GCC 11.2.0.

2021-08-01  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.8
	* NEWS: Record release date.

	build: update gnulib to latest

2021-07-31  Jim Meyering  <meyering@fb.com>

	cmp: avoid reading uninitialized memory
	[This *is* useful, so reapply. ]
	When comparing buffers a word at a time, cmp could read up to
	sizeof (word) - 1 uninitialized bytes.
	* src/cmp.c (cmp): Set not just a single guaranteed-differing
	sentinel byte just beyond any final read byte, but also ensure
	that any following bytes are defined, if those may be read via
	block_compare's word-at-a-time comparison.  Reported by Bruno Haible
	in https://lists.gnu.org/r/diffutils-devel/2021-07/msg00003.html

2021-07-28  Bruno Haible  <bruno@clisp.org>

	cmp: avoid reading uninitialized memory
	One or both of the sentinel bytes were copies of uninitialized values.
	* src/cmp.c (cmp): Use arbitrary initialized values for the
	sentinel bytes.

2021-07-28  Jim Meyering  <meyering@fb.com>

	cmp: revert preceding change
	It did not solve the problem. The next patch does.

2021-07-27  Jim Meyering  <meyering@fb.com>

	cmp: avoid reading uninitialized memory
	When comparing buffers a word at a time, cmp could read up to
	sizeof (word) - 1 uninitialized bytes.
	* src/cmp.c (cmp): Set not just a single guaranteed-differing
	sentinel byte just beyond any final read byte, but also ensure
	that any following bytes are defined, if those may be read via
	block_compare's word-at-a-time comparison.  Reported by Bruno Haible
	in https://lists.gnu.org/r/diffutils-devel/2021-07/msg00003.html

2021-07-19  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2021-05-21  Paul Eggert  <eggert@cs.ucla.edu>

	diff: better --color help
	* src/diff.c (option_help_msgid): Reword --color help without
	using the confusing word “default”.  Problem reported
	by Peter Oliver (Bug#48532).

2021-05-20  Paul Eggert  <eggert@cs.ucla.edu>

	doc: fix URL in HACKING

2021-03-24  Paul Eggert  <eggert@cs.ucla.edu>

	diff: pacify compiler re style
	* src/diff.c (usage): Prefer &"string"[N] to "string" + N.
	Some compilers complain about the latter, as they worry C++
	refugees will think it’s string concatnation.

	diff3: avoid signed int overflow
	* src/diff3.c (main): Avoid signed integer overflow in the very
	unlikely case of more than INT_MAX incompatible options.  Instead,
	use one bit to record the presence of each type of incompatible
	option, and report an error if more than one bit is set.

	maint: don’t bother with -Wno-return-local-addr
	* configure.ac (WERROR_CFLAGS): Don’t bother with
	-Wno-return-local-addr as it doesn’t seem to work.
	Anyway, it’s no longer needed on Ubuntu 20.10.

	maint: disable -Wstack-protector
	* configure.ac (WERROR_CFLAGS): Disable -Wstack-protector, as it
	has a false alarm with lib/vasnprintf.c on Ubuntu 20.10 and it’s
	not worth working around.  Coreutils already disables it.

	diff: plug memory leak in ifdef.c
	Problem reported by Than (Bug#47362).
	Fix the bug by using xmalloca instead of vararrays.
	* bootstrap.conf (gnulib_modules): Add xmalloca; remove vararrays.
	* configure.ac: Remove AC_C_VARARRAYS.
	* src/ifdef.c: Include xmalloca.h instead of xalloc.h.
	(do_printf_spec): Use xmalloca instead of an xmalloc
	that lacks a corresponding ‘free’ if HAVE_C_VARARRAYS
	due to a typo in 2017-05-18T05:51:31Z!meyering@fb.com.

	build: update gnulib submodule to latest

2021-01-02  Paul Eggert  <eggert@cs.ucla.edu>

	maint: work around GCC -Wreturn-local-addr bug
	* configure.ac: Do not use -Wreturn-local-addr in Gnulib,
	to suppress a false alarm in vasnprintf.c.

2021-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright year number ranges
	Run "make update-copyright" and then...
	* gnulib: Update to latest with copyright year adjusted.
	* tests/init.sh: Sync with gnulib to pick up copyright year.
	* bootstrap: Likewise.

2020-12-05  Jim Meyering  <meyering@fb.com>

	build: require autoconf-2.64
	* configure.ac: Require 2.64, up from 2.63, to align with gnulib.

2020-03-15  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest

	doc: adjust formatting to make apropos (man -k) work better
	* man/Makefile.am $(dist_man1_MANS): Adjust sed substitution
	to also remove the space after "GNU". This avoids the single
	leading space on each man page title line.  I'm guessing that
	interfered with indexing/searching, causing "man -k diff3" to
	print this: diff3 (1) - (unknown subject).
	Reported by Dan Jacobon in http://bugs.gnu.org/39769.

2020-01-19  Jim Meyering  <meyering@fb.com>

	doc: correct an ancient "At present"
	* doc/diffutils.texi (Unified Format): Correct the now
	seriously outdated "At present" (referring to early 1990s)
	statement to be more of a historical note.
	Reported by Roland Illig in http://bugs.gnu.org/39184.

2020-01-05  Jim Meyering  <meyering@fb.com>

	doc: use program name, not "GNU", in the nroff/man header
	* man/Makefile.am (dist_man1_MANS): Elide "GNU " prefix
	from the generated prog+one-line-summary, so that help2man
	uses the program name rather than "GNU" as the nroff "name".
	Reported by Dan Jacobson in http://bugs.gnu.org/38574.

2020-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright year number ranges
	Run "make update-copyright" and then...
	* gnulib: Update to latest with copyright year adjusted.
	* tests/init.sh: Sync with gnulib to pick up copyright year.
	* bootstrap: Likewise.

2019-12-29  Jim Meyering  <meyering@fb.com>

	maint: avoid gnulib-tool deprecation warnings, and build failure
	* bootstrap.conf (gnulib_modules): Use getopt-gnu, rather than
	obsolete "getopt" module. Use nstrftime in place of strftime.
	(avoided_gnulib_modules): Do not avoid the "lock" module. That
	would lead to a build failure due to "glthread/lock.h not found".

	maint: avoid syntax-check failure
	* po/POTFILES.in: Add argmatch.h; remove xstrtol-error.c

	maint: disable two and reenable many warning options
	* configure.ac (GNULIB_WARN_CFLAGS): Disable -Wduplicated-branches
	and -Wreturn-local-addr, due to a couple of false-positive warnings.
	(WARN_CFLAGS): Reenable many warnings that now (with recent gcc)
	provoke no false positive.

	maint: avoid gnulib's lock-tests module
	* bootstrap.conf (avoided_gnulib_modules): Also --avoid=lock-tests
	to avoid gnulib-related build failure.

2019-12-23  Jim Meyering  <meyering@fb.com>

	build: update gnulib to latest
	* gnulib: Update submodule to latest.
	* bootstrap: Copy from gnulib.
	* tests/init.sh: Likewise.

2019-12-20  Jim Meyering  <meyering@fb.com>

	maint: tweak bootstrap.conf
	* bootstrap.conf (buildreq): Require at least autoconf 2.62,
	up from 2.61, just as grep and coreutils do.
	(bootstrap_post_import_hook): "Copy pkg-config's pkg.m4 ...",
	copied from grep's bootstrap.conf.
	(avoided_gnulib_modules): Pull this definition to the top.
	Formatting.

2019-10-01  Dave Odell  <dmo2118@gmail.com>  (tiny change)

	cmp: add test case for Bug#37558
	* tests/cmp: New test case (Bug#37558).

2019-10-01  Paul Eggert  <eggert@cs.ucla.edu>

	cmp: fix -l width bug
	Problem reported by Dave Odell (Bug#37558).
	* src/cmp.c (cmp): Treat negative ‘bytes’ as infinite, fixing a
	bug introduced in the 2019-08-27 patch that fixed Bug#35256.

2019-08-27  Paul Eggert  <eggert@cs.ucla.edu>

	diff: don’t mistreat -N in arg as a large number
	Problem reported by alec (Bug#35256).
	* NEWS: Mention the fix.
	* bootstrap.conf (gnulib_modules): Use strtoimax and xstrtoimax,
	not strtoumax and strtoumax.
	* src/cmp.c (bytes): Now signed, with -1 representing no limit.
	All uses changed.
	* src/cmp.c (specify_ignore_initial, main):
	* src/diff.c (main):
	* src/ifdef.c (format_group):
	* src/sdiff.c (interact):
	Use strtoimax, not strtoumax.

	build: update gnulib submodule to latest

2019-07-19  Paul Eggert  <eggert@cs.ucla.edu>

	maint: ignore ‘configure’ temporaries
	* .gitignore: Ignore confdefs*, conftest*.

	maint: avoid Gnulib setlocale module
	Problem reported for MS-Windows by Richard Gering (Bug#34376).
	Diffutils doesn’t need any of the Gnulib fixes for setlocale.
	* bootstrap.conf (gnulib_tool_option_extras):
	Avoid the setlocale module.

2019-05-24  KO Myung-Hun  <komh@chollian.net>

	tests: init.cfg: use $PATH_SEPARATOR not ':'
	On OS/2, a path separator is semi-colon ';' not colon ':'.
	* tests/init.cfg: Replace ':' with $PATH_SEPARATOR.

2019-01-20  Jim Meyering  <meyering@fb.com>

	build: ensure no VLA is used
	Cause developer builds to fail for any use of a VLA.
	VLAs (variable length arrays) limit portability.
	* configure.ac (nw): Remove -Wvla from the list of disabled warnings,
	thus enabling the warning when configured with --enable-gcc-warnings.
	(GNULIB_NO_VLA) Define, disabling use of VLAs in gnulib.  This commit
	is functionally equivalent to coreutils' v8.30-44-gd26dece5d.

	build: update gnulib to latest
	* gnulib: Update to latest.
	* po/POTFILES.in: Add lib/xstdopen.c.

2019-01-06  Paul Eggert  <eggert@cs.ucla.edu>

	diff: use xstdopen, not stdopen
	* bootstrap.conf (gnulib_modules):
	* src/cmp.c, src/diff.c, src/diff3.c, src/sdiff.c (main):
	Use xstdopen, not stdopen.

	build: update gnulib submodule to latest

2019-01-05  Jim Meyering  <meyering@fb.com>

	maint: convert all TABs to equivalent spaces in indentation
	Using this file,

	cat > leading-blank.exempt <<\EOF
	(\.gitmodules|help2man|pre-commit)$
	(?:^|\/)ChangeLog[^/]*$
	(?:^|\/)(?:GNU)?[Mm]akefile[^/]*$
	\.(?:am|mk)$
	EOF

	run the following command to convert all non-conforming leading white
	space to be all spaces:

	git ls-files \
	  | pcregrep -vf leading-blank.exempt \
	  | xargs pcregrep -l '^ *\t' \
	  | xargs perl -MText::Tabs -ni -le \
	    '$m=/^( *\t[ \t]*)(.*)/; print $m ? expand($1) . $2 : $_'

	Since that changed old NEWS, I also ran "make update-NEWS-hash"
	to update the old_NEWS_hash value in cfg.mk.

2019-01-05  Paul Eggert  <eggert@cs.ucla.edu>

	diff: fix cmp, diff3, sdiff with stdin closed
	* NEWS: Mention this.
	* src/cmp.c, src/diff3.c, src/sdiff.c: Include stdopen.h.
	(main): Call stdopen early.
	* src/cmp.c (main): Simplify now that we need not worry about
	stdin being closed.
	* src/diff.c (main): Translate stdopen diagnostic.

	diff: remove unportable ‘diff -N - f <&-’ feature
	* NEWS: Mention this.
	* bootstrap.conf (gnulib_modules): Add stdopen.
	* doc/diffutils.texi (Comparing Directories):
	Do not document behavior if stdin is closed.
	* src/diff.c: Include stdopen.h.
	(main): Call stdopen early.
	(compare_files) [__hpux]: Remove recently-introduced
	special case for HP-UX exec with stdin closed.
	* tests/new-file: Remove tests of the removed feature.

	build: update gnulib submodule to latest

2019-01-03  Bruno Haible  <bruno@clisp.org>

	diff: recognize file descriptors closed by the parent process on HP-UX
	* src/diff.c (compare_files): Use fcntl to distinguish a file
	descriptor closed by the parent process from a file descriptor
	that references /dev/null.

2019-01-01  Jim Meyering  <meyering@fb.com>

	maint: update all copyright dates via "make update-copyright"
	* gnulib: Also update submodule for its copyright updates.

2018-12-31  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.7
	* NEWS: Record release date.

	maint: distribute new file, init.cfg
	Otherwise, strip-trailing-cr would fail on a system without valgrind.
	* tests/Makefile.am (EXTRA_DIST): Include init.cfg.

2018-12-30  Dennis Lambe Jr  <malsyned@malsyned.net>

	diff: adjust ANSI escapes for compatibility with less -R
	GNU less can display ANSI-colored text with the -R flag, but this
	support has some limitations. One of them is that if an escape
	sequence starts on one line and ends on a different line, only the
	first line will be colored in less.

	As a result, when diff creates colored output with multi-line deletes
	or adds, less will only color the first line.

	This change resets ANSI color to the default at the end of
	each line and restarts it at the beginning of the next. It patches
	normal and context mode. Side-by-side already worked in my testing.
	* src/context.c (print_context_label, pr_context_hunk): As above.
	(pr_unidiff_hunk, print_context_header): Likewise.
	* src/normal.c (print_normal_hunk): Likewise.
	* tests/colors: Adjust existing tests to accommodate this.
	* NEWS (Improvements): Mention it.
	Proposed in http://bugs.gnu.org/31105

2018-12-29  Jim Meyering  <meyering@fb.com>

	tests: fix colors test on systems lacking fractional timestamp support
	* tests/colors: The .NNNNNNNNN suffix is not printed on some systems.
	Adapt the test to accommodate those systems.

	tests: strip-trailing-cr: avoid failure with ASAN
	Valgrind cannot operate on an ASAN-compiled binary.
	* tests/strip-trailing-cr (valgrind): Define as no-op when diff
	was compiled with sanitizer support.

2018-12-28  Jim Meyering  <meyering@fb.com>

	tests: add test for --strip-trailing-cr UMR bug
	* tests/strip-trailing-cr: New file. Test for today's bug fix.
	* tests/Makefile.am (TESTS): Add it.

	tests: import test infrastructure from coreutils
	* tests/init.cfg: New file, for require_valgrind_ definition (from coreutils).
	* tests/Makefile.am (PATH): Don't set stderr_fileno_ here, since it is
	now initialized in init.cfg.

2018-12-28  Paul Eggert  <eggert@cs.ucla.edu>
	    Jim Meyering  <jim@meyering.net>

	diff: fix UMR with --strip-trailing-cr
	Problem reported by Hongxu Chen (Bug#31935).
	* src/io.c (prepare_text): Strip trailing CR before
	doing the rest of the analysis.
	* NEWS: Mention the fix.

2018-12-28  Bruno Haible  <bruno@clisp.org>

	tests: colors: avoid test failure on AIX 7
	* tests/colors: Splice the argument into the printf format string.

2018-12-27  Bruno Haible  <address@hidden>

	maint: don't use an undocumented Autoconf macro
	* configure.ac: Use AC_CONFIG_HEADERS instead of AC_CONFIG_HEADER.

2018-12-23  Jim Meyering  <meyering@fb.com>

	build: avoid build failure with --enable-gcc-warnings and latest gcc
	* src/diff.c (usage): Assert that each line length is no longer than
	the minimum required size of 4095.  This lets newer gcc (currently
	9.0.0 20181219) infer that it need not issue this warning:
	diff.c:1012:19: error: '%.*s' directive output between 0 and 2147483647
	bytes may exceed minimum required size of 4095
	[-Werror=format-overflow=]
	1012 |        printf ("  %.*s", msglen, msg);

	build: update gnulib to latest; and bootstrap and init.sh

	build: make the autoconf-2.63 requirement explicit
	* configure.ac: AC_PREREQ: Require 2.63, not 2.59. And quote properly.
	Autoconf-2.63 has been required for some time via gnulib.
	This merely makes it explicit.

2018-12-20  Jim Meyering  <meyering@fb.com>

	maint: use https: in gnu mirror URL prefix, not http
	This appears in the generated release announcement message.
	* cfg.mk (url_dir_list): Use https: prefix, not http:.

2018-07-24  Paul Eggert  <eggert@cs.ucla.edu>

	cmp: fix bug in -b diagnostic
	Problem reported by mancha (Bug#32249).
	* src/cmp.c (count_newlines): Restore old value of sentinel.
	* tests/cmp: Test for the bug.

	build: update gnulib submodule to latest

2018-05-14  Paul Eggert  <eggert@cs.ucla.edu>

	doc: prepend "GNU" to NAME in man pages
	Requested by RMS.
	* src/cmp.c, src/diff.c, src/diff3.c, src/sdiff.c:
	Prepend "GNU" to first comment, so that the man page says "GNU".

2018-04-20  Paul Eggert  <eggert@cs.ucla.edu>

	sdiff: port to mingw
	Problem reported by Ross Burton (Bug#31218).
	* src/sdiff.c (checksigs): Use ‘raise’, not ‘kill’.

2018-03-23  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2018-01-14  Jim Meyering  <meyering@fb.com>

	tests: fix quoting error in previous change
	* tests/colors: Double-quote $PATH.

2018-01-06  Jim Meyering  <meyering@fb.com>

	tests: port tests/colors to some env-munging shell
	* tests/colors: Also set PATH="$PATH" in env invocation.

	maint: update gnulib and copyright dates for 2018
	* gnulib: Update to latest.
	* all files: Run "make update-copyright".
	* bootstrap: Update from gnulib.

	maint: suppress gcc's new -Wcast-function-type in gnulib
	* configure.ac (WERROR_CFLAGS): Suppress gcc's new -Wcast-function-type
	warning in gnulib, because it would trigger on this:
	sig-handler.h:47:12: error: cast between incompatible function types\
	  from 'void (* const)(int,  siginfo_t *, void *)' \
	  {aka 'void (* const)(int,  struct <anonymous> *, void *)'} \
	  to 'void (*)(int)' [-Werror=cast-function-type]
	return (sa_handler_t) a->sa_sigaction;

2017-10-22  Jim Meyering  <meyering@fb.com>

	tests: add expected-failing test for minor subopimality
	In some unusual cases, diff -u prints suboptimal output.
	* tests/large-subopt: New test script.
	* tests/Makefile.am (TESTS): Add it.
	(XFAIL_TESTS): Add it here, too, to record that this test is
	currently expected to fail.
	* tests/large-subopt.in1, tests/large-subopt.in2: Inputs derived from
	those in http://bugs.gnu.org/28796

2017-09-23  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

2017-05-21  Jim Meyering  <meyering@fb.com>

	maint: make the announcement template Cc the devel- list
	* cfg.mk (announcement_Cc_): Define.

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.6
	* NEWS: Record release date.

2017-05-19  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

2017-05-18  Jim Meyering  <meyering@fb.com>

	maint: update to work with GCC7's -Werror=implicit-fallthrough=
	* src/system.h (FALLTHROUGH): Define.
	Use new FALLTHROUGH macro in place of comments
	* src/cmp.c: FIXME
	* src/diff3.c: FIXME
	* src/ifdef.c: FIXME
	* src/sdiff.c: FIXME
	* src/side.c: FIXME
	* src/util.c: FIXME

	gnulib: update to latest

2017-05-09  Jim Meyering  <meyering@fb.com>

	tests: new-file: closed-stdin: also ensure stdout was empty
	* tests/new-file: Also require that "out" be empty.

2017-05-06  Jim Meyering  <meyering@fb.com>

	maint: stop using @acronym{...} in texinfo sources
	* doc/diffutils.texi: Remove all uses of @acronym{...},
	per recommendation by Karl Berry.
	* cfg.mk (local-checks-to-skip): Remove exemption, enabling
	the @acronym{-prohibiting syntax-check rule.

2017-05-05  Paul Eggert  <eggert@cs.ucla.edu>

	cmp: improve EOF diagnostic
	This improves on yesterday's change, following up on a
	remark by Jim Meyering (Bug#22816#21).
	* doc/diffutils.texi (Invoking cmp, cmp Options): Follow POSIX more
	closely in the documentation of the information appended to the EOF
	diagnostic.
	* src/cmp.c (cmp): Be more specific about the shorter file's length
	and fix some off-by-1 issues in reporting line counts.
	* tests/cmp: Adjust to match new behavior.
	Don't assume internal details about stdio buffering.

2017-05-04  Benno Schulenberg  <bensberg@justemail.net>

	diff: describe each --help option with a single string
	* src/diff.c: To ease translating, fuse four description pieces
	into two whole ones.  Also reword and rewrap one of them to fit
	within eighty characters.

2017-05-04  Paul Eggert  <eggert@cs.ucla.edu>

	cmp: report prefix length when one file is shorter
	Requested by Dan Jacobson (Bug#22816).
	* NEWS:
	* doc/diffutils.texi (Invoking cmp, cmp Options): Document this.
	* src/cmp.c (cmp): Implement it.
	* tests/Makefile.am (TESTS): Add cmp.
	* tests/cmp: New file.

2017-05-02  Jim Meyering  <meyering@fb.com>

	tests: add test for latest fix
	* NEWS (Bug fixes): Describe it.
	* tests/invalid-re: New test for just-fixed bug.
	* tests/Makefile.am (TESTS): Add it.

	gnulib: update to latest

2017-04-27  Paul Eggert  <eggert@cs.ucla.edu>

	diff: don't crash if regexp is invalid
	Problem reported by Marcel Böhme in:
	http://lists.gnu.org/archive/html/bug-diffutils/2017-04/msg00002.html
	* src/diff.c (add_regexp): Exit if re_compile_pattern fails.

2017-03-24  julama  <julama@fake-box.com>

	tests: avoid false failure for unreadable /proc/cmdline
	* tests/brief-vs-stat-zero-kernel-lies: Use "test -r" rather than
	just "test -f".  This avoids a false test failure on a linux system
	with grsecurity and its GRKERNSEC_PROC_USER option enabled, for which
	/proc/cmdline is unreadable.  Reported in https://bugs.gnu.org/26155

2017-02-01  Jim Meyering  <meyering@fb.com>

	tests: avoid false failure with some shells on debian, freebsd
	* tests/colors: Move the TERM=dumb setting into the code run by
	"returns_", since some shells do not propagate envvar setting through
	to a use of a function like this.  That would cause this test to fail
	because results were colorized when they should not have been.
	Reported by Nelson Beebe.

2017-01-31  Jim Meyering  <meyering@fb.com>

	maint: add "introduced in 3.4" in latest NEWS entry
	* NEWS: Update.  Also, thanks to Nelson Beebe for reporting this.

	diff: avoid UMR with ---presume-output-tty
	* src/diff.c (main): Always define presume_output_tty.
	Otherwise, it would be read uninitialized.
	Introduced in v3.3-45-g17e2698
	* NEWS (Bug fixes): Mention it.

	gnulib: update to latest; and update bootstrap and init.sh

	maint: change "time stamp" to "timestamp" globally
	This avoids a new syntax-check failure.
	* ChangeLog-2008: Perform that change.
	* doc/diffutils.texi: Likewise.
	* NEWS: Likewise.
	* cfg.mk: Update the old news hash accordingly.

2017-01-01  Jim Meyering  <meyering@fb.com>

	maint: update gnulib and copyright dates for 2017
	* gnulib: Update to latest.
	* all files: Run "make update-copyright".

2016-11-08  Jim Meyering  <meyering@fb.com>

	tests: use "returns_" rather than explicit comparison with "$?"
	* tests/colors: Use "returns_ 1" rather than testing $? = 1
	* tests/basic: Likewise.
	* tests/binary: Likewise.
	* tests/filename-quoting: Likewise.
	* tests/function-line-vs-leading-space: Likewise.
	* tests/ignore-matching-lines: Likewise.
	* tests/label-vs-func: Likewise.
	* tests/new-file: Likewise.
	* tests/no-dereference: Likewise.
	* tests/no-newline-at-eof: Likewise.
	* tests/stdin: Likewise.

2016-10-25  Paul Eggert  <eggert@cs.ucla.edu>

	diff: fix big performance degradation in 3.4
	* NEWS, doc/diffutils.texi (Overview): Document this.
	* src/analyze.c (diff_2_files): Restore too_expensive heuristic,
	but this time with a floor that is 16 times the old floor.  This
	should fix Bug#16848, by generating good-quality output for its
	test case, while not introducing Bug#24715, by running nearly as
	fast as diff-3.3 for that test case.

	build: update gnulib submodule to latest

2016-10-16  Jim Meyering  <meyering@fb.com>

	maint: use die rather than error
	Use "die (N, ..." rather than "error (N, ..." whenever N is a nonzero
	constant.  That lets the compiler know that control never goes beyond
	that point, and thus makes unnecessary the occasional following
	"abort ();" or "break;" statement we have historically added to inform
	static analysis tools of this aspect of "error" semantics.
	* src/die.h: New file.
	* src/Makefile.am (noinst_HEADERS): Add it.
	* src/cmp.c: Use die in place of error whenever the first
	argument is a nonzero constant.  Also remove any immediately-
	following call to abort, and include "die.h".
	* src/diff.c: Likewise.
	* src/diff3.c: Likewise.
	* src/sdiff.c: Likewise.
	* src/util.c: Likewise.

2016-10-02  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

	build: avoid GCC 7's new warnings
	* src/util.c (get_funky_string): Adjust comment so that GCC 7's
	-Wimplicit-fallthrough recognizes it.
	* src/diff3.c (main): Cast boolean MERGE to "int" to avoid this:
	diff3.c:341:25: error: '~' on a boolean expression \
	[-Werror=bool-operation]

2016-08-30  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

2016-08-29  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest, to port to upcoming GCC 7
	This fixes compilation errors when using gcc-7-to-be that were
	due to missing backslashes in gnulib's intprops.h and an API
	change in functions like __builtin_add_overflow.  This ports
	to GCC 7's newer built-in overflow-checking functions.

2016-08-28  Paul Eggert  <eggert@cs.ucla.edu>

	diff: don't assume ptrdiff_t <= long long int
	* src/system.h (printint, pI): Port to (theoretical) platforms
	where ptrdiff_t is wider than long long int (Bug#24311).

2016-08-27  Paul Eggert  <eggert@cs.ucla.edu>

	diff: port line numbers to mingw64
	Problem reported by Peter Rosin (Bug#24311).
	* src/system.h (printint, pI): New typedef and macro.
	All uses of 'long int' and "%l" in printf format replaced by
	'printint' and "%"pI respectively.
	* src/ifdef.c (do_printf_spec): Don't assume pI is length 1.

2016-08-20  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.5
	* NEWS: Record release date.

2016-08-16  Jim Meyering  <meyering@fb.com>

	build: arrange to build with -fno-common, when possible
	* configure.ac (WERROR_CFLAGS): Add -fno-common, when possible.
	This would have prevented the duplicate definition of
	presume_output_tty that was fixed in v3.4-10-gc2dc91f.

2016-08-16  Hanno Böck  <hanno@hboeck.de>

	diff: avoid duplicate definition of presume_output_tty
	* src/util.c (presume_output_tty): Remove this definition.
	The other is in diff.h.  Reported in https://bugs.gnu.org/24248

2016-08-14  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

	tests: diff3: work around missing seq on some systems
	* tests/diff3 (seq): Provide a seq replacement function,
	since at least AIX, SunOS 5.10, OpenBSD-5.8 lack it.
	Reported by Assaf Gordon in https://bugs.gnu.org/24227#8

2016-08-13  Jim Meyering  <meyering@fb.com>

	diff3: fix leaks, for real
	* src/diff3.c (struct diff_block)[lint]: Add member, n2.
	(free_diff_block, next_to_n2): New functions.
	* tests/diff3: Add more test coverage.

	maint: require that commit messages be of a certain form
	* bootstrap.conf (bootstrap_epilogue): Merge from coreutils, so that
	a local commit hook will now help enforce consistent commit messages.
	* Makefile.am (check-git-hook-script-sync): New rule, largely copied
	from coreutils.
	* scripts/git-hooks/commit-msg: New file, from coreutils, but
	with adapted list of program names.
	* scripts/git-hooks/applypatch-msg: New file, from git.
	* scripts/git-hooks/pre-applypatch: Likewise.
	* scripts/git-hooks/pre-commit: Likewise.

2016-08-13  Bastian Beischer  <bastian.beischer@rwth-aachen.de>

	diff3: fix heap use-after-free; add minimal diff3 test coverage
	Commit v3.3-42-g3b74a90, "FIXME: src/diff3: plug a leak" added an
	invalid use of free, leading to use-after-free in nearly any invocation
	of diff3.  Revert that commit.
	* NEWS (Bug fixes): Mention it.
	* tests/diff3: New file, to add minimal test coverage.
	* tests/Makefile.am (TESTS): Add it.
	Reported by Bastian Beischer in http://bugs.gnu.org/24210

2016-08-13  Jim Meyering  <meyering@fb.com>

	build: ignore texinfo build artifacts
	* .gitignore: Ignore texinfo artifacts in doc/.

	maint: diff3: remove an unreachable statement
	* src/diff3.c (main): Remove unreachable "return" after exit from main.

2016-08-08  Jim Meyering  <meyering@fb.com>

	diff: disable colorization for TERM=dumb
	* src/diff.c (main): With --color or --color=auto, when TERM is
	"dumb", disable colorization.  Suggested by Daniel Colascione.
	* NEWS (Bug fixes): Mention it.
	* tests/colors: Add a test that would fail without this change,
	yet passes with it.

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.4
	* NEWS: Record release date.

2016-08-06  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

	tests: tweak built_programs definition
	* tests/Makefile.am (built_programs): Adjust to work around what
	may be a problem due to interaction between Solaris 10's /bin/sh
	and an old version of GNU make. Reported by Dagobert Michelsen
	in https https://bugs.gnu.org/24137.

2016-08-02  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

	tests: skip a /proc/self-dependent test on the Hurd
	* tests/brief-vs-stat-zero-kernel-lies: The Hurd's /proc/self
	is not useful, so detect that and skip the test that requires it.
	Reported by Assaf Gordon in https://debbugs.gnu.org/24121#29

2016-08-01  Jim Meyering  <meyering@fb.com>

	tests/colors: fix portability problem with touch --date
	* tests/colors (epoch): Don't use GNU touch's --date=$epoch option.
	Use the portable -t 197001010000.00.
	Reported by Assaf Gordon in https://debbugs.gnu.org/24121#8

	build: Solaris 9: avoid link failure due to isblank use
	* bootstrap.conf (gnulib_modules): Add isblank, to avoid a link
	error on Solaris 9 Sparc.  Reported by Dagobert Michelsen.

	test: improve test infrastructure
	* tests/envvar-check: New file, copied from grep, with the addition
	of the EDITOR and GREP_OPTIONS envvar names.
	* tests/Makefile.am (EXTRA_DIST): Add it.
	(TESTS_ENVIRONMENT): Revamp, to be more like that of grep.

2016-07-31  Jim Meyering  <meyering@fb.com>

	maint: remove gl/lib/reg*.c.diff; no longer needed
	* gl/lib/regcomp.c.diff: Remove file, now that gnulib's
	regcomp.c compiles regex.c with -Wno-unused-parameter.
	* gl/lib/regex_internal.c.diff: This file induced a change to ensure
	that the "Idx" type was unsigned and to remove a few "VAR < 0"
	comparisons.  These days, it is probably fine to stay in sync with
	gnulib/glibc's copies
	of these files, so remove these patches, too.
	* gl/lib/regexec.c.diff: Likewise.
	Prompted by a report by Assaf Gordon and a suggestion from Paul Eggert.

	tests: colors: fix a portability problem and work around a shell bug
	* tests/colors (e): Fix a portability bug: use printf '\033'
	rather than '\e' to generate the required byte sequence, since
	for some shells (at least dash 0.5.8), the latter doesn't work.
	Work around a shell bug whereby "local tab=$(printf '\t')"
	would result in an empty value for "$tab": hoist each "tab"
	definition up/out of its function to global scope.
	Reported by Assaf Gordon in http://debbugs.gnu.org/24116#8

2016-07-23  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest; and tests/init.sh
	* gnulib: Update to latest.
	* init.sh: Update from gnulib.

2016-05-30  Jim Meyering  <meyering@fb.com>

	maint: arrange for "make distcheck" to work with unreleased automake
	* dist-check.mk (my-distcheck): Remove all .deps directories
	before performing the recursive comparison.

2016-05-24  Glenn Morris  <rgm@gnu.org>

	doc: fix a reference to emacs' emerge node
	* doc/diffutils.texi (Interactive Merging): Correct a reference to
	emacs' emerge node: s/emerge/Emerge/.
	This addresses http://debbugs.gnu.org/23613

2016-04-30  Jim Meyering  <meyering@fb.com>

	maint: arrange for better URLs in generated announcement message
	* cfg.mk (url_dir_list): Define.  I had been correcting the generated
	URLs by hand, just before the announcement.  This is better.

2016-03-15  Jim Meyering  <meyering@fb.com>

	maint: don't ignore gitlog-to-changelog failure
	* Makefile.am (gen-ChangeLog): Don't ignore failure of
	gitlog-to-changelog. This syncs to coreutils' copy of this rule.

2016-03-06  Giuseppe Scrivano  <gscrivano@gnu.org>

	diff: --color: fix an infinite recursion bug
	* src/diff.h (presume_output_tty): New extern variable.
	* src/diff.c (PRESUME_OUTPUT_TTY_OPTION): New enum.
	(group_format_option): Add '-presume-output-tty'.
	(main): Handle PRESUME_OUTPUT_TTY_OPTION.
	* src/util.c: New variable `presume_output_tty'.
	(check_color_output): Handle presume_output_tty.
	(set_color_context): Call process_signals only when color_context is
	not RESET_CONTEXT.
	* tests/colors: Check that diff doesn't crash when interrupted
	in the middle of a color sequence.

	Reported by Gisle Vanem in http://debbugs.gnu.org/22067

2016-01-31  Jim Meyering  <meyering@fb.com>

	maint: update prereq version of gettext
	* configure.ac: Increase designated gettext version to 0.19.2
	* bootstrap.conf (buildreq): Likewise.
	Remove now-unnecessary code to remove gettext-provided files.

	gnulib: update to latest

2016-01-01  Jim Meyering  <meyering@fb.com>

	FIXME: src/diff3: plug a leak

2016-01-01  Jim Meyering  <meyering@fb.com>

	maint: update copyright year, bootstrap, init.sh
	Run "make update-copyright" and then...

	* gnulib: Update to latest.
	* tests/init.sh: Update from gnulib.
	* bootstrap: Likewise.

2015-12-06  Jim Meyering  <meyering@fb.com>

	diff --brief no longer mistakenly reports diff. with 0-sized /proc/ files
	Normally, it is safe to assume two regular files are different when
	their st_size values are different.  However, that assumption may
	be invalid if either value is zero, as happens with files on Linux
	/proc and /sys file systems. Since skipping this optimization will
	usually cost very little (one read syscall, to read zero bytes),
	it is fine to accommodate those unusual files.
	* src/analyze.c (diff_2_files): Do not assume regular files differ
	just because their st_size values differ when one or more is 0.
	* src/diff.c (compare_files): Likewise.
	* tests/brief-vs-proc-stat-zero: New test.
	* tests/Makefile.am: Add it.
	* NEWS (Bug fixes): Describe it.
	Reported by Stephan Müller in http://debbugs.gnu.org/21942

	tests: arrange to print any skipped-test explanation to tty, too
	I noticed that when a test was skipped, the reason was not printed.
	This fixes it.  In coreutils, this variable is set in init.cfg,
	but there is no point in putting the definition so far from the
	code that chooses the file descriptor number in tests/Makefile.am.
	* tests/Makefile.am (TESTS_ENVIRONMENT) [stderr_fileno_]: Define
	here (to 9), right next to the companion "9>&2".

2015-11-29  Jim Meyering  <meyering@fb.com>

	build: add gperf to the list of required programs
	* bootstrap.conf (buildreq): Add gperf to the list.
	Reported by Stephan Müller in http://debbugs.gnu.org/21945

2015-11-29  Giuseppe Scrivano  <gscrivano@gnu.org>

	tests: Add tests for --color and --palette
	* tests/colors: New file.
	* tests/Makefile.am (TESTS): Add colors.

	doc: mention --color and --palette in NEWS

	diff: add --palette
	* bootstrap (gnulib_modules): Add 'argmatch'.
	* doc/diffutils.texi: Add documentation for --palette
	* src/diff.h (set_color_palette): New prototype.
	* src/diff.c (set_color_palette): New function.
	(color_palette): New variable.
	* src/utils.c: Include "argmatch.h".
	(struct bin_str): New struct.
	(struct color_ext_type): New struct.
	(color_indicator): New array.
	(indicator_name): New array.
	(indicator_no): New enum.
	(parse_state): New enum.
	(put_indicator): New function.
	(get_funky_string): New function. Copied from coreutils ls.
	(parse_diff_color):  New function. Copied from coreutils ls
	"parse_ls_color" function.
	(set_color_context): Use put_indicator instead of directly
	outputting the sequence.
	* po/POTFILES.in: Add 'lib/argmatch.c'

	diff: add support for --color
	* doc/diffutils.texi (diff Options): Add documentation for --color.
	Copied from coreutils ls --color.
	* src/context.c (pr_unidiff_hunk): Set the color context.
	(print_context_header): Likewise.
	(pr_context_hunk): Likewise.
	* src/diff.h (enum colors_style): New enum to record when to use colors.
	(colors_style): New variable to memorize the argument value.
	(set_color_context): Add function definition.
	* src/diff.c: : Define COLOR_OPTION.
	(specify_colors_style): New function.
	(longopts): Add --color.
	(main): Handle --color argument.
	(option_help_msgid): Add usage string for --color.
	* src/normal.c (print_normal_hunk): Set the color context.
	* src/side.c (print_1sdiff_line): Likewise.
	* src/util.c (print_1_line_nl): New function.
	(print_1_line): Make it a wrapper of 'print_1_line_nl'.
	(colors_enabled): New boolean variable.
	(begin_output): Call check_color_output once the output file is
	configured.
	(output_1_line): Periodically call `process_signals'.
	(caught_signals): New sigset_t.
	(colors_enabled): New boolean variable.
	(interrupt_signal): New sig_atomic_t.
	(stop_signal_count): New sig_atomic_t.
	(check_color_output): New function.
	(install_signal_handlers): Likewise. Copied from coreutils ls.
	(process_signals): Likewise.  Copied from coreutils ls.
	(set_color_context): New function.
	(sighandler): Likewise.  Copied from coreutils ls.
	(stophandler): Likewise.  Copied from coreutils ls.

2015-09-24  Andreas Grünbacher  <agruen@gnu.org>

	diff: Improve help text of option --label
	* src/diff.c (option_help_msgid): Improve help text of option --label.

2015-09-01  Jim Meyering  <meyering@fb.com>

	build: correct man-page generation rule
	The PATH was set incorrectly, so that the diff used by
	help2man was the one from $PATH, rather than the just-built
	one.
	* man/Makefile.am (bin_dir): New variable, to...
	(dist_man1_MANS): ...prepend ../src to PATH, not just "..".
	Also, add a test to ensure that each $(bin_dir)/$$base is
	executable, so this doesn't happen again.
	In http://debbugs.gnu.org/21023, Rodrigo Valiña
	Gutiérrez reported that diff.1 from the diffutils-3.3 tarball
	contained no description of the then-new --no-dereference option.

2015-07-10  Jim Meyering  <meyering@fb.com>

	doc: --no-dereference: improve wording/description
	* doc/diffutils.texi (Comparing Directories): Correct grammar.
	(diff Options) [--no-dereference]: Say a little more.

2015-01-01  Jim Meyering  <meyering@fb.com>

	maint: update copyright year ranges to include 2015; update gnulib

2014-12-12  KO Myung-Hun  <komh@chollian.net>

	diff: skip test if seek is not possible on OS/2 kLIBC
	This fixes the problem that 'diff - file' and 'cat file | diff - file'
	fail due to a seek failure with a message 'diff.exe: -: Invalid seek',
	because seek does not work on stdin and a pipe on OS/2 kLIBC.

	* src/io.c (sip): Set skip_test to true if seek is not possible on
	OS/2 kLIBC.

2014-12-09  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest

2014-12-09  KO Myung-Hun  <komh78@gmail.com>

	build: double-quote use of $PATH
	* man/Makefile.am (dist_man1_MANS): On OS/2, PATH_SEPARATOR is ';',
	but unquoted, that is interpreted as the shell's statement
	terminator.  Quote it.

2014-10-27  Paul Eggert  <eggert@cs.ucla.edu>

	diff: fix integer overflow problem with --tabsize
	Reported by Tobias Stoeckmann in: http://bugs.gnu.org/18857
	* src/diff.c (main): Don't overflow if INTMAX_MAX / 2 < tabsize.
	* tests/bignum: New file, to test for this bug.
	* tests/Makefile.am (TESTS): Add it.

2014-09-03  Paul Eggert  <eggert@cs.ucla.edu>

	doc: mention diff -B fix in NEWS

	diff: fix bug with diff -B and incomplete lines
	Reported by Navin Kabra via Eric Blake in:
	http://bugs.gnu.org/18402
	* src/util.c (analyze_hunk): Don't mishandle incomplete
	lines at end of file.
	* tests/no-newline-at-eof: Test for the bug.

	diff: fix performance bug with prefix computation
	* src/io.c (find_identical_ends): Fix performance bug:
	the test for when the prefix was needed messed up by
	the 2002-02-28 integer-overflow fixes, causing performance to be
	worse than it needed to be.

2014-08-23  Jim Meyering  <meyering@fb.com>

	gnulib: update to latest, as well as bootstrap

	maint: update copyright year range in texinfo documentation
	* doc/diffutils.texi: Update copyright.

2014-04-15  Jim Meyering  <meyering@fb.com>

	maint: update bug-reporting address
	* README: Change bug-gnu-utils@... to bug-diffutils@gnu.org.
	* doc/diffutils.texi: Likewise.
	Reported by Jamie Landeg Jones.

2014-03-26  Paul Eggert  <eggert@penguin.cs.ucla.edu>

	diff: fix two "..." typos in --help output
	* src/diff.c (option_help_msgid): Remove two "..." typos (Bug#17102).

2014-03-25  Paul Eggert  <eggert@cs.ucla.edu>

	doc: improve documentation about reading and stdin
	See Bug#17075.
	* doc/diffutils.texi (Comparison): Say that files need not be read.
	(Invoking diff): Remove confusing remark about 'diff - -'.
	It's not that useful, and it's not portable anyway.

2014-02-24  Paul Eggert  <eggert@cs.ucla.edu>

	diff, sdiff: minor integer overflow fixes
	* src/context.c (find_hunk):
	Simplify, now that 2 * context + 1 cannot overflow.
	* src/diff.c (main):
	* src/sdiff.c (interact):
	Don't rely on undefined behavior on signed integer overflow.
	* src/diff.c (main): Don't let contexts exceed CONTEXT_MAX.
	* src/system.h (CONTEXT_MAX): New macro.

	diff: fix bug with -I and overlapping hunks
	Problem reported by Vincent Lefevre in <http://bugs.gnu.org/16864>.
	* src/context.c (find_hunk): Threshold is CONTEXT only if
	the second change is ignorable.
	* tests/ignore-matching-lines: New test.
	* tests/Makefile.am (TESTS): Add it.

2014-02-23  Paul Eggert  <eggert@cs.ucla.edu>

	diff: remove TOO_EXPENSIVE heuristic
	Problem reported by Vincent Lefevre in <http://bugs.gnu.org/16848>.
	The simplest solution is to remove the TOO_EXPENSIVE heuristic
	that I added to GNU diff in 1993.  Although appropriate for
	circa-1993 hardware, these days the heuristic seems to be more
	trouble than it's worth.
	* NEWS: Document this.
	* doc/diffutils.texi (Overview): Modernize citations.
	Remove mention of TOO_EXPENSIVE heuristic.
	* src/analyze.c (diff_2_files): Adjust to TOO_EXPENSIVE-related
	API changes in gnulib's diffseq module.

	build: update gnulib submodule to latest

2014-01-31  Paul Eggert  <eggert@cs.ucla.edu>

	diff: exit with status 1, not 2, when binary files differ
	Problem reported by Vincent Lefevre in <http://bugs.gnu.org/16608>.
	* NEWS:
	* doc/diffutils.texi (Binary, Invoking diff): Document this.
	* src/analyze.c (briefly_report): Return void, not int.
	All uses changed.  Do not futz with exit status.  Simplify.
	* tests/binary: Adjust to match new behavior.

2013-09-26  Paul Eggert  <eggert@cs.ucla.edu>

	build: omit -Wsuggest-attribute=pure for lib
	* configure.ac (WARN_CFLAGS): Omit -Wsuggest-attribute=pure
	when compiling the lib subdirectory.  Reported for Fedora 19
	by Eric Blake in <http://bugs.gnu.org/15463>.

2013-08-22  Paul Eggert  <eggert@cs.ucla.edu>

	cmp, diff, sdiff: tune by using rawmemchr
	On my platform (AMD Phenom II X4 910e, Fedora 17 x86-64), this sped up
	'cmp -n 8GiB /dev/full /dev/zero' by a factor of 3.8, and
	'cmp -sn 8GiB /dev/full /dev/zero' by a factor of 1.8.
	* bootstrap.conf (gnulib_modules): Add rawmemchr.
	* src/cmp.c (cmp): Optimize the common case where buffers are the same,
	by using count_newlines rather than block_compare_and_count.
	(block_compare_and_count): Remove.
	(count_newlines): New function.
	* src/cmp.c (count_newlines):
	* src/io.c (prepare_text):
	* src/sdiff.c (lf_copy, lf_skip, lf_snarf):
	Use rawmemchr instead of memchr, for speed.

2013-08-12  Paul Eggert  <eggert@cs.ucla.edu>

	cmp: tune 'cmp a b' for GCC x86
	Performance problem reported by David Balažic in:
	http://lists.gnu.org/archive/html/bug-diffutils/2013-08/msg00013.html
	* src/system.h (word): Make it size_t, not uintmax_t.
	This sped up plain cmp 90% on my tests (GCC 4.8.1, x86).

2013-07-06  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2013-05-06  Stefano Lattarini  <stefano.lattarini@gmail.com>

	build: enable 'subdir-objects' automake option
	The future major Automake version (2.0, ETA at least one year from now)
	might enable that option unconditionally, so better get prepared in due
	time.

	* configure.ac (AM_INIT_AUTOMAKE): Adjust.
	(AM_PROG_CC_C_O): New, required by Automake up to 1.13.x when the
	'subdir-objects' is in use.

2013-04-28  Paul Eggert  <eggert@cs.ucla.edu>

	build: update gnulib submodule to latest

2013-04-03  Paul Eggert  <eggert@cs.ucla.edu>

	diff: fix bug with Asian file names
	Problem reported by Errembault Philippe in:
	http://lists.gnu.org/archive/html/bug-diffutils/2013-03/msg00012.html
	* NEWS: Document this.
	* src/dir.c (compare_names): Fall back on file_name_cmp if
	compare_collated returns 0, unless ignoring file name case.
	(diff_dirs): Don't bother with the O(N**2) stuff unless ignoring
	file name case.
	* tests/Makefile.am (TESTS): Add strcoll-0-names.
	* tests/strcoll-0-names: New file.

	diff: remove unnecessary decl
	* src/dir.c (compare_names_for_qsort): Remove declaration.
	Not needed now that we assume C89.

	diff: tune compare_names_for_qsort
	* src/dir.c (compare_collated): New function.
	(compare_names): Use it.
	(compare_names_for_qsort): Use it.  This is a bit more efficient
	as it can avoid a double invocation of file_name_cmp when
	file_name_cmp returns zero.

2013-03-30  Jim Meyering  <meyering@fb.com>

	doc: mention new option, --no-dereference in 3.3's NEWS
	* NEWS (New feeatures): Update 3.3's news to mention --no-dereference.
	Reported by Denis Excoffier.
	* Makefile.am (old_NEWS_hash): Update, since this modifies old, and
	normally-immutable NEWS.

2013-03-26  Paul Eggert  <eggert@cs.ucla.edu>

	tests: port to Solaris 10 /bin/sh
	* tests/Makefile.am (TESTS_ENVIRONMENT):
	Use "FOO=val; export FOO" rather than "export FOO=val",
	as the latter form doesn't work with Solaris /bin/sh.
	Problem found when trying to run "make check" on Solaris 10.

2013-03-24  Jim Meyering  <meyering@fb.com>

	maint: post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.3
	* NEWS: Record release date.

2013-03-23  Paul Eggert  <eggert@cs.ucla.edu>

	doc: fix menu typo
	* doc/diffutils.texi (Comparing Three Files): Fix out-of-order menu.
	Bug caught by Texinfo 5.0.

	maint: update build procedure to recent gettext etc.
	* bootstrap.conf (gnulib_modules): Add vararrays.
	(needed_gnulib_files, unnecessary_gettext_files): New vars.
	(bootstrap_post_import_hook): New function, to implement these vars.
	(excluded_files): Remove; 'bootstrap' no longer supports this.
	Its function is now performed by unnecessary_gettext_files.
	(buildreq): Update automake to 1.12.2, to avoid CVE-2012-3386.
	* configure.ac (AM_GNU_GETTEXT_VERSION): Bump from 0.17 to 0.18.2,
	to lessen the probability that we'll have outlandishly old files
	during a build.
	* m4/vararrays.m4: Remove from repository, as we now use the
	gnulib version.

2013-03-21  Jim Meyering  <jim@meyering.net>

	build: update gnulib to latest and adapt; update bootstrap, too
	Blindly updating to the latest from gnulib, bootstrap would
	fail due to failure of our local patches to apply.  Hence,
	these first two updates.
	* gl/lib/regex_internal.c.diff: Update offsets, so this patch
	applies to the latest from gnulib.
	* gl/lib/regex_internal.h.diff: Remove file.  No longer needed.
	* bootstrap: Update from gnulib.

2013-01-06  Paul Eggert  <eggert@cs.ucla.edu>

	tests: port to hosts lacking fmt, make -C
	* tests/Makefile.am (built_programs): Don't assume fmt works.
	Don't rely on 'make -C', either.

	maint: update .gitignore for recent gnulib
	* .gitignore: Add tests/*.trs and several *.h and *.sed files in lib,

2013-01-04  Jim Meyering  <jim@meyering.net>

	build: update gnulib submodule to latest

	maint: update all copyright year number ranges
	Run "make update-copyright".

2012-10-23  Eric Blake  <eblake@redhat.com>

	build: default to --enable-gcc-warnings in a git tree
	Anyone building from cloned sources can be assumed to have a new
	enough environment, such that enabling gcc warnings by default will
	be useful.  Tarballs still default to no warnings, and the default
	can still be overridden with --disable-gcc-warnings.
	* configure.ac (gl_gcc_warnings): Set default based on environment.

2012-10-03  Paul Eggert  <eggert@cs.ucla.edu>

	* doc/diffutils.texi (cmp Options): Document -l format better.

2012-09-10  Jim Meyering  <meyering@redhat.com>

	maint: use xasprintf in place of xmalloc+sprintf
	* bootstrap.conf (gnulib_modules): Add gnulib's xvasprintf module.
	* src/util.c: Include "xvasprintf.h".
	(begin_output): Use xasprintf in place of xmalloc+sprintf.

2012-09-10  Andreas Gruenbacher  <agruen@gnu.org>

	diff: encode file names with special characters
	* src/util.c (c_escape_char): New function.
	(c_escape): New function.
	(begin_output): Escape file names when needed.
	* src/context.c (print_context_header): New names parameter.
	(print_context_label): New name parameter.
	* src/diff.h (print_context_header): Change prototype.
	* tests/filename-quoting: New file.
	* NEWS: Document this change.

2012-08-30  Paul Eggert  <eggert@cs.ucla.edu>

	diff: silence GCC warning instead of slowing down
	* src/dir.c (find_dir_file_pathname): Use 'IF_LINT (volatile)' to
	silence the gcc warning, rather than using 'volatile', as the
	warning appears to be bogus.

2012-08-28  Jim Meyering  <meyering@redhat.com>

	diff: avoid possible longjmp-triggered misbehavior
	* src/dir.c (find_dir_file_pathname): gcc 4.8.0 20120825 reported
	that a local variable's value might be clobbered.  Declare "match"
	to be volatile.

	build: update gnulib, bootstrap and init.sh to latest

	maint: avoid new syntax-check failure due to @xref use
	* doc/diffutils.texi: Change several "; @xref{..." to ".  @xref{...",
	since @xref should start a sentence.

2012-05-15  Paul Eggert  <eggert@cs.ucla.edu>

	maint: remove ms subdirectory
	diffutils is now designed to build with Cygwin or MinGW.
	The old DJGPP stuff probably doesn't work anyway.
	* Makefile.am (SUBDIRS): Remove ms.
	* NEWS: Document this.
	* configure.ac (AC_CONFIG_FILES): Remove ms/Makefile.
	* ms/Makefile.am, ms/README, ms/config.bat, ms/config.sed:
	* ms/config.site: Remove.

2012-05-14  Paul Eggert  <eggert@cs.ucla.edu>

	maint: update bootstrap from gnulib
	* bootstrap: Update from gnulib.

	main: port subcommands to mingw
	Problem reported by Eli Zaretskii in
	<http://lists.gnu.org/archive/html/bug-gnu-utils/2012-05/msg00013.html>.
	Approach suggested by Bruno Haible as option (4) in
	<http://lists.gnu.org/archive/html/bug-gnu-utils/2012-05/msg00036.html>.
	* bootstrap.conf (gnulib_modules): Add system-quote.
	* src/diff3.c, src/sdiff.c, src/util.c:
	Include <system-quote.h>, not <sh-quote.h>.
	* src/diff3.c (read_diff):
	* src/sdiff.c (main, edit):
	* src/util.c (begin_output):
	Use system_quote_argv, for portability to Mingw.
	* src/sdiff.c (NUM_SIGS, handler_index_of_SIGINT): Now enum
	values, not macros; this is cleaner and avoids a GCC warning if
	!HAVE_WORKING_VFORK.
	* src/util.c (begin_output) [! HAVE_WORKING_FORK]: Do not use -f,
	for consistency with the HAVE_WORKING_FORK code.

	maint: update bootstrap from gnulib
	* bootstrap: Update from gnulib.

	maint: m4/gnulib-cache.m4 is not under version control
	This is like what coreutils does, and suppresses 'git status' chatter.
	* .gitignore: Add /m4/gnulib-cache.m4.

	Use binary mode when testing for binary files.
	This reverts the 2006-01-05 change and modernizes to the current API.
	Idea suggested by Eli Zaretskii in:
	http://lists.gnu.org/archive/html/bug-gnu-utils/2012-05/msg00066.html
	* src/cmp.c (main):
	* src/diff.c (main, compare_files):
	Use set_binary_mode rather than SET_BINARY.
	* src/diff.c (compare_files): Omit unnecessary use of O_BINARY.
	* src/io.c (sip): Sample unknown files in binary mode, to see
	whether they are binary.
	(read_files): Read binary files in binary mode.

	build: update gnulib submodule to latest

2012-05-13  Stefano Lattarini  <stefano.lattarini@gmail.com>

	build: omit obsolete AM_PROG_CC_STDC macro
	The Automake-provided macro 'AM_PROG_CC_STDC' has been superseded by
	the Autoconf-provided one 'AC_PROG_CC' since October 2002, and will
	be removed in the next major automake version.
	* configure.ac (AM_PROG_CC_STDC): Drop it.

2012-05-05  Jim Meyering  <meyering@redhat.com>

	diff: fix a typo that was always disabling the same_special_file macro
	* src/system.h (same_special_file): Correct cpp guard expression:
	s/HAVE_ST_RDEV/HAVE_STRUCT_STAT_ST_RDEV/.  Reported by Eli Zaretskii.

2012-04-17  Jim Meyering  <meyering@redhat.com>

	maint: update bootstrap from gnulib
	* bootstrap: Update from gnulib.

2012-03-07  Eric Blake  <eblake@redhat.com>

	usage: improve wording of --ignore-matching-lines
	* src/diff.c (option_help_msgid): Tweak wording.

2012-03-04  Paul Eggert  <eggert@cs.ucla.edu>

	doc: explain -I RE better in --help output
	* src/diff.c, src/sdiff.c (option_help_msgid): For -I RE,
	change "whose lines all match" to "all whose lines match" to avoid
	unintended interpretation.  Reported by Danijel Tasov in
	<http://bugs.debian.org/648411>.

2012-02-12  Paul Eggert  <eggert@cs.ucla.edu>

	sdiff: remove dependency on sigprocmask
	* bootstrap.conf (gnulib_modules): Remove sigprocmask.
	* src/sdiff.c (temporary_file): No need to invoke sigprocmask
	here, since the signal handler merely sets a flag.

2012-02-04  Paul Eggert  <eggert@cs.ucla.edu>

	diff: -N, --unidirectional-new-file now compare to "-" too
	* NEWS: Document this.
	* doc/diffutils.texi (Comparing Directories): Likewise.
	Also, document that these options work at the top level.
	* src/diff.c (compare_files): Treat EBADF like ENOENT, to handle
	the case where "-" is closed.  Allow the other file to be
	STDIN_FILENO, in case it's "-".
	* tests/Makefile.am (TESTS): Add new-file.
	* tests/new-file: New file.

2012-01-25  Paul Eggert  <eggert@cs.ucla.edu>

	maint: quote 'like this' or "like this", not `like this'
	This is in response to a recent change in the GNU coding standards,
	which now suggest quoting 'like this' or "like this", instead of
	`like this' or ``like this''.
	* HACKING, NEWS, README, README-hacking, TODO, doc/diagmeet.note:
	* doc/diffutils.texi, ms/config.bat, ms/config.site:
	* src/analyze.c, src/cmp.c, src/context.c, src/diff.c:
	* src/diff.h, src/diff3.c, src/dir.c, src/ifdef.c, src/io.c:
	* src/sdiff.c, src/side.c, src/system.h, src/util.c:
	* tests/help-version:
	Quote 'like this' or "like this" in commentary.
	* cfg.mk (old_NEWS_hash): Adjust to reflect new NEWS quoting.
	* man/help2man: Update to 1.40.4 version, with quoting fixed as above.
	* po/en.po: Remove translation involving `, as it's no longer needed.
	* src/cmp.c (try_help, specify_ignore_initial, usage, main):
	* src/diff.c (main, try_help, option_help_msgid, specify_value)
	(compare_files):
	* src/diff3.c (main, try_help, option_help_msgid, usage)
	(read_diff):
	* src/dir.c (compare_names):
	* src/sdiff.c (try_help, usage, check_child_status, main):
	* src/util.c (finish_output):
	* tests/help-version:
	Quote 'like this' in output.

	build: update gnulib submodule to latest

2012-01-12  Jim Meyering  <meyering@redhat.com>

	build: accommodate newer bootstrap from gnulib
	* bootstrap.conf (gnulib_tool_option_extras): Add both --symlink
	and --makefile-name=gnulib.mk.  Also remove now-obsolete $bt/ prefix.
	* bootstrap: Update from gnulib.
	* tests/init.sh: Update from gnulib.
	* lib/Makefile.am: Initialize numerous variables, so that
	generated code in gnulib.mk may use += to append to them.

	maint: avoid new syntax-check failure
	* src/diff.c (compare_files): Use STREQ, not strcmp.

2012-01-08  Bruno Haible  <bruno@clisp.org>

	New option --no-dereference.
	* src/diff.h (no_dereference_symlinks): New variable.
	* src/diff.c: Include xreadlink.h.
	(longopts): Add --no-dereference option.
	(main): Accept --no-dereference option.
	(option_help_msgid): Mention the --no-dereference option.
	(compare_files): If no_dereference_symlinks is true, use lstat()
	instead of stat(). Compare symbolic links by comparing their values.
	* bootstrap.conf (gnulib_modules): Add lstat, stat, xreadlink.
	* doc/diffutils.texi (Comparing Directories, diff Options): Mention the
	--no-dereference option.
	* tests/no-dereference: New file.
	* tests/Makefile.am (TESTS): Add it.

2012-01-01  Jim Meyering  <meyering@redhat.com>

	maint: update all copyright year number ranges
	Run "make update-copyright".

2011-12-14  Jim Meyering  <meyering@redhat.com>

	build: update to latest gnulib and adapt
	* tests/binary: Reverse arguments to compare to avoid failure of
	new syntax-check rule.
	* configure.ac: Use -Wno-format-nonliteral.
	Mark functions as pure of const, per recommendations enabled by
	new gcc -W options.  Use _GL_ATTRIBUTE_PURE and _GL_ATTRIBUTE_CONST.
	* lib/cmpbuf.h (buffer_lcm, block_compare):
	Apply pure and/or const attributes.
	* src/cmp.c (block_compare): Likewise.
	* src/context.c (find_hunk): Likewise.
	* src/diff.h (lines_differ): Likewise.
	* src/diff3.c (skipwhite): Likewise.
	* src/dir.c (dir_loop): Likewise.
	* src/util.c (find_change, find_reverse_change): Likewise.
	(translate_line_number): Likewise.

	build: stop distributing gzip'd releases;  xz is enough
	* configure.ac (AM_INIT_AUTOMAKE): Add no-dist-gzip.

2011-11-29  Jim Meyering  <meyering@redhat.com>

	tests: use "compare exp out", not "compare out exp"
	Likewise, when an empty file is expected, use "compare /dev/null out",
	not "compare out /dev/null". I.e., specify the expected/desired contents
	via the first file name.  Prompted by a suggestion from Bruno Haible
	in http://thread.gmane.org/gmane.comp.gnu.grep.bugs/4020/focus=29154

	Run these commands:

	  git grep -l -E 'compare [^ ]+ exp' \
	    |xargs perl -pi -e 's/\b(compare) (\S+) (exp\S*)/$1 $3 $2/'
	  git grep -l -E 'compare [^ ]+ /dev/null' \
	    |xargs perl -pi -e 's,\b(compare) (\S+) (/dev/null),$1 $3 $2,'

	But manually convert this one:

	  -compare out exp-$(echo $opt|tr ' ' _)
	  +compare exp-$(echo $opt|tr ' ' _) out

	and avoid an inappropriate change to cfg.mk.

2011-10-12  Stefano Lattarini  <stefano.lattarini@gmail.com>

	tests: use more portable fd redirection in TESTS_ENVIRONMENT
	* tests/Makefile.am (TESTS_ENVIRONMENT): Redirection with `exec 9>&2'
	is not portable to various Korn shells, and to (at least) HP-UX 11
	/bin/sh.  Use a more portable idiom.
	See http://thread.gmane.org/gmane.comp.gnu.coreutils.bugs/22488 for
	lots of discussion.

2011-10-11  Stefano Lattarini  <stefano.lattarini@gmail.com>

	tests: make test runner a script, not a shell function
	All the test scripts in the diffutils testsuite are shell scripts,
	so the current definition of TESTS_ENVIRONMENT, which adaptively
	run tests using either perl or the shell depending on their kind,
	is an overkill.

	Moreover, this change is required in order for the testsuite to
	continue to work with the new testsuite harness that is planned
	to be introduced in Automake 1.12 (which, as of the writing date,
	is still under development and in late alpha state).

	See also related discussion on bug-coreutils:
	 <http://debbugs.gnu.org/cgi/bugreport.cgi?bug=8887>

	* tests/Makefile.am (TESTS_ENVIRONMENT): Remove definition of the
	`shell_or_perl_' shell function, which is not required anymore.
	(LOG_COMPILER): New, define to `$(SHELL)'.
	* tests/binary: Make executable.
	* tests/colliding-file-names: Likewise.
	* tests/excess-slash: Likewise.
	* tests/no-newline-at-eof: Likewise.

2011-10-04  Claudio Bley  <claudio.bley@gmail.com>

	portability: use SET_BINARY rather than xfreopen (NULL, ...
	* src/diff.c: Include binary-io.h, not xfreopen.h.
	(main): Use SET_BINARY (...) rather than xfreopen (NULL, X, ...),
	because the latter doesn't work on MinGW and crashes using MSVC.
	* src/cmp.c (main): Likewise.

2011-10-04  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

2011-09-02  Jim Meyering  <meyering@redhat.com>

	post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.2
	* NEWS: Record release date.

	build: update bootstrap and tests/init.sh from gnulib
	* bootstrap: Update from gnulib.
	* tests/init.sh: Likewise.

	build: update gnulib submodule to latest

2011-09-01  Jim Meyering  <meyering@redhat.com>

	doc: diffutils' texi-derived doc may now be in debian's "main" section
	* NEWS (Packaging): Mention the "no front/back-cover" change.

2011-08-14  Jim Meyering  <meyering@redhat.com>

	maint: avoid new "make sytnax-check" failure.
	* src/diff.h (find_dir_file_pathname): Mark declaration with "extern"
	keyword, in order to placate the tight-scope syntax check.

2011-08-14  Paul Eggert  <eggert@cs.ucla.edu>

	* src/io.c (find_and_hash_each_line): Refactor for brevity.

2011-08-14  Roland McGrath  <roland@hack.frob.com>

	diff, sdiff: new option --ignore-trailing-space (-Z)
	Derived from Roland McGrath's patch (dated June 2004!) in:
	http://lists.gnu.org/archive/html/bug-gnu-utils/2004-07/msg00000.html
	* NEWS:
	* doc/diffutils.texi (White Space, Blank Lines)
	(sdiff Option Summary, diff Options, sdiff Options): Document -Z.
	* src/diff.h (IGNORE_TRAILING_SPACE)
	(IGNORE_TAB_EXPANSION_AND_TRAILING_SPACE): New constants, for -Z.
	* src/diff.c (shortopts, longopts, main, option_help_msgid):
	* src/sdiff.c (longopts, option_help_msgid, main):
	* src/io.c (find_and_hash_each_line):
	* src/util.c (lines_differ, analyze_hunk): Support -Z.

2011-08-13  Paul Eggert  <eggert@cs.ucla.edu>

	* bootstrap.conf (gnulib_modules): Remove timegm.
	This fixes a problem noted by Andreas Schwab in:
	http://lists.gnu.org/archive/html/bug-diffutils/2011-08/msg00035.html

2011-08-13  Tim Waugh  <twaugh@redhat.com>

	diff: --ignore-file-name-case now applies at top level too
	Derived from Tim Waugh's patch in:
	http://lists.gnu.org/archive/html/bug-diffutils/2011-08/msg00034.html
	* NEWS, doc/diffutils.texi (diff Options): Document this.
	* src/diff.c (compare_files): Implement this, by using
	find_dir_file_pathname.
	* src/diff.h (find_dir_file_pathname): New decl.
	* src/dir.c: Include filenamecat.h.
	(find_dir_file_pathname): New function.

2011-08-13  Paul Eggert  <eggert@cs.ucla.edu>

	* .gitignore: Add lib/unistr, lib/unused-parameter.h.

2011-08-10  Jim Meyering  <meyering@redhat.com>

	post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.1
	* NEWS: Record release date.

	build: use largefile module and update to latest gnulib
	* configure.ac: Remove AC_SYS_LARGEFILE, subsumed by ...
	* bootstrap.conf (gnulib_modules): ...this.  Use largefile module.
	* gnulib: Update to latest.

2011-08-08  Santiago Vila  <sanvila@unex.es>

	doc: insert comma in --help line for --ignore-space-change (-b)
	* src/diff.c (option_help_msgid): Insert omitted comma between
	"-b" and "--ignore-space-change".  (tiny change)

2011-08-04  Jim Meyering  <meyering@redhat.com>

	doc: relax restriction on front-cover and back-cover texts
	* doc/diffutils.texi (copying): Relax restriction on front-cover
	and back-cover texts (just as m4 did here:
	http://git.savannah.gnu.org/cgit/m4.git/commit?id=ee1e92ec).
	Reported by Santiago Vila.  Fix suggested by Eric Blake.

2011-08-03  Jim Meyering  <meyering@redhat.com>

	tests: update init.sh from gnulib
	* tests/init.sh: Update from gnulib.

	build: update gnulib submodule to latest

2011-07-03  Jim Meyering  <meyering@redhat.com>

	maint: remove inclusion of unused header, for "make syntax-check"
	* src/diff3.c: Don't include <inttostr.h>.  Not used.
	* src/context.c: Likewise.

2011-06-19  Jim Meyering  <meyering@redhat.com>

	build: don't require perl when building from a tarball
	But do ensure -- in all other circumstances -- that the man/*.1
	files are rebuilt whenever the version number changes.
	* configure.ac (SRC_VERSION_C): Define.
	* man/Makefile.am (dist_man1_MANS): Rename from $(man1_MANS),
	so that we distribute those pesky man/*.1 files.
	(EXTRA_DIST): Reflect name change.
	(MAINTAINERCLEANFILES): Define this, not DISTCLEANFILES,
	now that these generated files are distributed.
	($(dist_man1_MANS)): Depend on $(SRC_VERSION_C), so we get the
	full dependency when not building from a tarball.

2011-06-13  Jim Meyering  <meyering@redhat.com>

	doc: do not distribute generated man/*.1 man files
	* man/help2man: New file.
	* man/Makefile.am: Use $(srcdir)/help2man.
	Convert $(dist_man1_MANS) to $(man1_MANS), to tell automake
	not to distribute the generated man/*.1 files.  Now they're
	generated at build-from-tarball time.
	($(man1_MANS)): Depend on version.c, so that man pages are
	regenerated whenever the version string changes.

	build: ccache works better without embedded version strings
	* src/Makefile.am: Generate version.c and version.h and put the
	new symbol in a tiny library to be used by each program.
	(LDADD): Add the new library.
	* src/cmp.c (main): Use Version, not PACKAGE_VERSION, so the .o
	file does not change with each commit-derived version increment.
	* src/diff.c (main): Likewise.
	* src/diff3.c (main): Likewise.
	* src/sdiff.c (main): Likewise.
	* src/system.h: Include "version.h".
	* .gitignore: Add version.[ch]

2011-06-12  Jim Meyering  <meyering@redhat.com>

	doc: ensure each program has a man/*.x file: add "SEE ALSO" references
	* man/cmp.x: New file.
	* man/diff3.x: New file.
	* man/sdiff.x: New file.
	* man/diff.x: Add xrefs to the other three programs, and to patch.
	* man/Makefile.am (EXTRA_DIST): List new files.
	(cmp.1, diff3.1, sdiff.1): Depend on each .x file.

	doc: rename diff.texi to diffutils.texi
	This makes the .texi basename the same as the package name,
	which is consistent with most other GNU packages.
	* doc/diffutils.texi: Rename from...
	* doc/diff.texi: ...removed.
	* doc/Makefile.am (info_TEXINFOS): Reflect name change.
	(diffutils_TEXINFOS): Likewise.
	* cfg.mk (gendocs_options_): Remove this customization.  It is no
	longer needed, now that the .texi name matches that of the package.
	* man/Makefile.am ($(dist_man1_MANS)): Remove now-unnecessary sed
	filter.
	* README: Update references to diffutils.texi etc. here, too.
	* .gitignore: Update here, too.
	Suggested by Karl Berry.

2011-06-08  Karl Berry  <karl@freefriends.org>

	cmp, diff, diff3, sdiff: edit and align --help text.
	* cmp.c (option_help_msgid, usage),
	* diff.c (option_help_msgid, usage),
	* diff3.c (option_help_msgid, usage),
	* sdiff.c (option_help_msgid, usage): align descriptions in the --help
	output and slightly edit content.

2011-05-27  Paul Eggert  <eggert@cs.ucla.edu>

	diff: don't use locales after local-specific sorting fails
	* src/dir.c (compare_names): Don't invoke strcasecmp if
	locale-specific sorting fails, because POSIX.1-2008 says strcasecmp
	has unspecified behavior outside the POSIX locale.  See:
	http://lists.gnu.org/archive/html/bug-diffutils/2011-05/msg00008.html

	bootstrap: Avoid multithreading.
	* bootstrap.conf (gnulib_tool_option_extras):
	Add "--avoid=localename --avoid=lock", because we don't want to
	bring in the multithreading code that recent gnulib changes would
	otherwise bring in.
	(excluded_files): Remove m4/lock.m4; no longer needed, now that
	we use --avoid=lock.

	build: update gnulib submodule to latest

2011-05-23  Karl Berry  <karl@gnu.org>

	maint: update README-hacking
	* README-hacking: Update a la coreutils for git, etc.

2011-05-23  Jim Meyering  <meyering@redhat.com>

	maint: update gnulib to latest with accompanying tight-scope tweaks
	* cfg.mk: Include $(srcdir)/dist-check.mk using "-include",
	to accommodate the new sc_tight_scope rule.
	(_gl_TS_extern): Define, to tell gnulib's tight_scope rule that
	headers here mark externs with "XTERN".
	* gnulib: Update to latest.

2011-05-18  Jim Meyering  <meyering@redhat.com>

	maint: use gnulib's new readme-release module
	* bootstrap.conf (gnulib_modules): Add readme-release.
	(bootstrap_epilogue): Add the recommended perl one-liner.
	* README-release: Remove file; it is now generated from gnulib.
	* .gitignore: Add it.

	build: update gnulib submodule to latest

	maint: prepare for the tight-scope check
	* src/diff.h: Mark function declarations with "extern" in
	preparation for the tight-scope check.
	(ignore_white_space): Separate enum decl from declaration
	of this variable.
	* src/Makefile.am (diff_SOURCES): Move diff.h from here to ...
	(noinst_HEADERS): ...here.
	For convenience, since the tight-scope rule uses $(noinst_HEADERS).

	maint: don't use now-removed gnulib "exit" module
	* bootstrap.conf (gnulib_modules): Remove "exit" module.
	It no longer exists.

2011-03-26  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	* .x-sc_space_tab: Remove file.  Instead, ...
	* cfg.mk (exclude_file_name_regexp--sc_space_tab): ...define this.

	maint: fix typo in unused rule
	* cfg.mk (config-save): Fix typo: add leading "_" in variable name.

2011-03-18  Jim Meyering  <meyering@redhat.com>

	doc: add a reference to wdiff(1) from diff.1
	* man/diff.x: New file, to add "SEE ALSO" reference to wdiff(1).
	* man/Makefile.am (diff.1): Depend on diff.x.
	($(dist_man1_MANS)): Tell help2man to include diff.x.
	(EXTRA_DIST): Add diff.x.
	Suggestion from Dan Jacobson in http://bugs.debian.org/613319

2011-03-18  Eric Blake  <eblake@redhat.com>

	docs: info should mention -L
	* doc/diff.texi (diff Options): Document -L.

	docs: diff --help should mention -L
	* src/diff.c (option_help_msgid): Document -L.

2011-02-15  Jim Meyering  <meyering@redhat.com>

	doc: speak of the --test (-a) option, not "the -a or --test option"
	Convert using this command:
	perl -pi -e \
	  's/(\@option{-.}) or (\@option{--.*?}) option/$2 ($1) option/' \
	  doc/diff.texi
	Then convert some more with this:
	perl -pi -e \
	    's/the (\@option{-.}) or (\@option{--.*?})$/the $2 ($1)/' \
	  doc/diff.texi
	Then convert more manually.

	Suggested by Dan Jacobson

2011-01-24  Jim Meyering  <meyering@redhat.com>

	maint: remove all uses of vfork: use fork instead
	Our use of vfork now provokes warnings from gcc-4.6.0.
	Also, vfork is no longer even specified by POSIX.1-2008.
	* src/diff3.c (read_diff): Change each use of vfork to "fork".
	Remove #ifdef'd code.
	* src/util.c (begin_output, finish_output): Likewise.
	* src/sdiff.c (cleanup, main, edit): Likewise.
	(handler_index_of_SIGPIPE): Remove now-unused definition.
	* src/system.h: Don't include <vfork.h>.
	(vfork): Remove definition.
	* ms/config.site: Remove reference to vfork cache variable.

	tests: avoid newer but less-portable tail option syntax
	* tests/function-line-vs-leading-space: Use sed -n '3,$p' rather than
	tail -n+3.  Older versions of tail do not accept that newer syntax.
	Reported by Sudhakara Peram.

	tests: fix an erroneous test
	On most systems, like-named files were compared, by luck.
	However, on others, different-named files would be compared
	since their names were being treated as equal -- but they had
	different content, so the test would fail.
	* tests/colliding-file-names: Use different sets of file names
	in d1 and d2 so that they cannot accidentally match.
	Put the same line in each test file.  This is required
	when files named e.g., abc and ABC are compared.
	This test was failing on a NixOS 86_64-darwin system.

	build: update gnulib submodule to latest

	tests: fix typo that silently disabled all tests
	* tests/Makefile.am (TESTS): Fix typo: s/jESTS/TESTS/

2011-01-23  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	maint: avoid new syntax-check failure
	* src/diff.c (specify_value): Use !STREQ(...), not strcmp(...) != 0.
	* src/diff3.c (main): Likewise.

2011-01-03  Jim Meyering  <meyering@redhat.com>

	maint: update copyright year ranges to include 2011
	Run "make update-copyright", so "make syntax-check" works in 2011.

	build: update gnulib submodule to latest

2010-12-16  Paul Eggert  <eggert@cs.ucla.edu>

	bootstrap: adjust to recent gnulib changes
	* bootstrap.conf (excluded_files): Do not exclude m4/size_max.m4
	and m4/xsize.m4 when using an external gettext, since they are
	now needed by other gnulib modules.

2010-12-16  Jim Meyering  <meyering@redhat.com>

	doc: add contributor guidelines: HACKING
	* HACKING: New file, copied 99% from the one in grep's repository.

2010-10-09  Jim Meyering  <meyering@redhat.com>

	maint: describe policy on copyright year number ranges
	* README: Mention coreutils' long-standing policy on use of M-N
	ranges in copyright year lists.  Requested by Richard Stallman.

2010-09-04  Jim Meyering  <meyering@redhat.com>

	maint: adjust init.sh use to conform
	* tests/help-version: Use one line: "${srcdir=.}/init.sh"; ...
	* tests/basic: Likewise.
	* tests/binary: Likewise.
	* tests/colliding-file-names: Likewise.
	* tests/excess-slash: Likewise.
	* tests/function-line-vs-leading-space: Likewise.
	* tests/help-version: Likewise.
	* tests/label-vs-func: Likewise.
	* tests/no-newline-at-eof: Likewise.
	* tests/stdin: Likewise.

	maint: avoid shadowing warning
	* src/dir.c (diff_dirs): Rename shadowed local cmp to "c".

2010-09-03  Jim Meyering  <meyering@redhat.com>

	build: use gettext-h, not gettext
	* bootstrap.conf (gnulib_modules): Use gettext-h, not gettext.
	The latter is overkill for a package that uses
	AM_GNU_GETTEXT([external]...

	build: update build/test tools from gnulib
	* bootstrap: Update from gnulib.
	* tests/init.sh: Likewise.

	build: update gnulib submodule to latest

2010-08-14  Jim Meyering  <meyering@redhat.com>

	diff -r: avoid printing excess slashes in concatenated file names
	* bootstrap.conf (gnulib_modules): Add filenamecat.
	* src/diff.c: Include "filenamecat.h".
	(compare_files): Use file_name_concat, rather than dir_file_pathname.
	* src/util.c (dir_file_pathname): Remove now-unused function.
	* src/diff.h: Remove its declaration.
	* tests/excess-slash: New script to test for this.
	* tests/Makefile.am (TESTS): Add it.
	Forwarded by Santiago Vila from <bugs.debian.org/586301a>,
	reported by Jari Aalto.

2010-08-12  Paul Eggert  <eggert@cs.ucla.edu>

	diff: avoid spurious diffs when two distinct dir entries compare equal
	Problem reported by Christoph Anton Mitterer in:
	http://lists.gnu.org/archive/html/bug-diffutils/2010-08/msg00000.html

	* NEWS: Mention this bug fix.
	* src/dir.c (compare_names_for_qsort): Fall back on file_name_cmp
	if two distinct entries in the same directory compare equal.
	(diff_dirs): Prefer a file_name_cmp match when available.
	* tests/Makefile.am (TESTS): New test colliding-file-names.
	* tests/colliding-file-names: New file.

2010-05-09  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	build: don't define macros that gnulib provides
	* bootstrap.conf (gnulib_modules): Add signal, stdint.
	* lib/cmpbuf.c (SA_RESTART, SA_INTERRUPT): Remove definitions.
	(SIZE_MAX, PTRDIFF_MAX): Likewise.
	Include <stdint.h>.
	* src/system.h (WEXITSTATUS, WIFEXITED): Remove definitions.
	(SA_RESTART, SA_INTERRUPT): Likewise.

	build: rely on gnulib's sigprocmask module
	* src/sdiff.c: Remove #if-!HAVE_SIGPROCMASK-guarded code.
	* bootstrap.conf (gnulib_modules): Add sigprocmask.

2010-05-04  Jim Meyering  <meyering@redhat.com>

	doc: README-release: don't mention To:, Cc:, etc announcement headers,
	now that those are supplied automatically via gnulib's maint.mk.
	* README-release: sync with coreutils.

	maint: teach web-doc-generating code how to do its job
	* cfg.mk (gendocs_options): Define, so that gendocs.sh knows
	the name of our texinfo source file.
	* gnulib: Update to latest, for new gnu-web-doc-update and maint.mk.

2010-05-03  Jim Meyering  <meyering@redhat.com>

	doc: update release procedure
	* README-release: Rearrange slightly: post the announcement to
	Savannah first, so you can include a link to that post in the email.
	Sync a few details from coreutils' README-release.

	post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 3.0
	* NEWS: Record release date.

	build: update gnulib submodule to latest

2010-04-30  Jim Meyering  <meyering@redhat.com>

	build: use gnulib's sys_wait module
	* bootstrap.conf (gnulib_modules): Use gnulib's sys_wait module,
	now that we assume its presence.

	build: update gnulib submodule to latest
	* bootstrap: Also update from gnulib.
	* tests/init.sh: Likewise

	maint: remove now-useless #if HAVE_HEADER_H guards
	* src/system.h: Include <sys/wait.h> unconditionally,
	now that gnulib guarantees its presence.
	* lib/cmpbuf.c: Likewise for <unistd.h> and <inttypes.h>.

2010-04-16  Jim Meyering  <meyering@redhat.com>

	tests: use original no-newline-at-eof test, but with -U1, not -U2
	* tests/no-newline-at-eof: Revert to the smaller test, but with
	-U1 rather than -U2, since that actually triggers the bug.

2010-04-16  Paul Eggert  <eggert@cs.ucla.edu>

	Followon improvements for the fix for Debian bug 577832.
	* src/io.c (find_and_hash_each_line): Omit the inserted newline in
	a simpler way.
	* tests/no-newline-at-eof: Fix the test case so that it rejects
	the old, buggy behavior.

2010-04-16  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	tests: test for the no-newline-at-EOF bug
	* tests/no-newline-at-eof: New file.
	* tests/Makefile.am (TESTS): Add it.

2010-04-16  Jim Meyering  <meyering@redhat.com>

	diff: fix a regression when at least one input lacks a newline-at-EOF,
	and the final hunk plus context-length aligns exactly with the end
	of the newline-lacking file.  Diff would fail to output the required
	"\ No newline at end of file" line, thus rendering the output invalid.
	This bug appears to have been introduced by 2006-05-07
	commit 58d0483b, "(find_identical_ends): Fix huge performance bug...",
	at least to the extent that reverting that change fixes the bug.
	Considering the stated effect of that change and lack of metrics,
	reverting it is not an option, so here we take a more direct approach.

	Given these inputs,

	    printf '\n1'>a; printf '\n0\n\n1'>b

	and running diff like this:

	    ./diff -U1 a b

	for input file "b", the pointer, files[1].linbuf[4][-1], to
	the last byte on the final line was mistakenly pointing at the
	sentinel newline at EOF, rather than at the preceding byte.

	  (gdb) p files[1].linbuf[4][-1]
	  $3 = 10 '\n'

	Thus, this test in the final print_1_line call:

	  if ((!line_flag || line_flag[0]) && limit[-1] != '\n')
	    fprintf (out, "\n\\ %s\n", _("No newline at end of file"));

	would fail, because limit[-1] (which is files[1].linbuf[4][-1])
	was mistakenly '\n', rather than the desired '1'.

	My first thought was simply to adjust the final linbuf[line] setting,
	at the end of io.c's find_and_hash_each_line function function:

	       if (p == bufend)
	-       break;
	+       {
	+         if (current->missing_newline)
	+           --linbuf[line];
	+         break;
	+       }

	But that would make diff misbehave with this input
	(same as above, but with a newline appended to "a"),

	    printf '\n1\n'>a; printf '\n0\n\n1'>b
	    ./diff -U1 a b

	due to the block (100 lines above) that is triggered in that case
	(but not in the both-files-missing-newline case):

	      if (p == bufend
	          && current->missing_newline
	          && ROBUST_OUTPUT_STYLE (output_style))
	        {
	          /* This line is incomplete.  If this is significant,
	             put the line into buckets[-1].  */
	          if (ignore_white_space < IGNORE_SPACE_CHANGE)
	            bucket = &buckets[-1];

	          /* Omit the inserted newline when computing linbuf later.  */
	          p--;
	          bufend = suffix_begin = p;
	        }

	Note how "p" is decremented and "bufend" adjusted.
	When that happens, we certainly don't want to decrement
	"bufend" yet again.

	Since there is no other way to determine at the end whether "bufend"
	was already decremented, add a new variable to serve as witness.

	* NEWS (Bug fixes): Mention it.
	Reported by Timo Juhani Lindfors in http://bugs.debian.org/577832.
	Forwarded by Santiago Vila.

2010-04-16  Jim Meyering  <meyering@redhat.com>

	tests: update init.sh from gnulib
	* tests/init.sh: Update from gnulib.

2010-04-08  Jim Meyering  <meyering@redhat.com>

	build: include cfg.mk and dist-check.mk in the distribution tarball
	* Makefile.am (EXTRA_DIST): Add cfg.mk and dist-check.mk.

	maint: update to latest gnulib
	* cfg.mk (sc_cross_check_PATH_usage_in_tests): Remove rule,
	now that it's in gnulib's maint.mk.
	* gnulib: Update to latest.

2010-04-07  Jim Meyering  <meyering@redhat.com>

	tests: make new PATH-crosschecking syntax-check tighter
	* cfg.mk (sc_cross_check_PATH_usage_in_tests): Use grep's -x (match
	entire line) option with -F.

	tests: pull latest help-version from gzip
	* tests/help-version: Update from gzip.
	* Makefile.am (TESTS_ENVIRONMENT): Export VERSION,
	as required for this new help-version script.

	tests: add syntax-check rule to verify that tests use proper PATH
	* cfg.mk (sc_cross_check_PATH_usage_in_tests): New rule, that is
	useful only in conjunction with the help-version script.

	tests: use path_prepend_ consistently; remove unnecessary VERBOSE check
	* tests/basic: Likewise.
	* tests/binary: Likewise.
	* tests/function-line-vs-leading-space: Likewise.
	* tests/label-vs-func: Likewise.
	* tests/stdin: Likewise.

2010-04-06  Eric Blake  <eblake@redhat.com>

	maint: ignore generated files
	* .gitignore: Ignore recent gnulib additions.

	maint: update to latest bootstrap
	* bootstrap: Copy from gnulib/build-aux.

2010-04-05  Jim Meyering  <meyering@redhat.com>

	tests: get latest init.sh from gnulib
	* tests/init.sh: Update from gnulib.

	build: update gnulib submodule to latest; adapt
	* cfg.mk (local-checks-to-skip): Add new sc_texinfo_acronym, to skip it.

	diff -F/-p: don't depend on locale-specific white-space definition
	* src/context.c: Include "c-ctype.h".
	Use c_isspace, not isspace.

2010-03-18  Jim Meyering  <meyering@redhat.com>

	tests: exercise new behavior of -F RE
	* tests/function-line-vs-leading-space: New file.
	* tests/Makefile.am (TESTS): Add it.

2010-03-18  Yannick Moy  <yannick.moy@adacore.com>

	with -F or -p, emit better function lines: no leading white space
	* src/diff.c (print_context_function): For languages like Ada
	that allow local functions and procedures, the plain context
	function line may start with enough blank characters that the
	function name does not get completely printed in the 40
	characters limit.  This patch solves this problem by removing
	these useless initial blank characters.
	* NEWS (Changes in behavior): Mention this change.

2010-03-17  Jim Meyering  <meyering@redhat.com>

	build: don't require a specific version of help2man
	* bootstrap.conf (buildreq): Bootstrap can't deal with it,
	perhaps because the command name contains a digit.

	build: make bootstrap ensure that help2man is available
	* bootstrap.conf (buildreq): Add help2man.

2010-02-23  Jim Meyering  <meyering@redhat.com>

	tests: test for the "Binary files A and B differ" diagnostic
	* tests/binary: New script.
	* tests/Makefile.am (TESTS): Add it.

	revert 2002 change that removed "Binary " from "files A and B differ"
	With this change, "printf '\0'|diff - /dev/null" now prints
	"Binary files - and /dev/null differ" once again.
	This reverts 2002-06-28 commit a352f0980,
	"(briefly_report): Don't say "Binary files differ", ...".
	* src/analyze.c (briefly_report): Do include the "Binary " prefix
	in the diagnostic, when !brief.
	* NEWS (Changes in behavior): Mention the diagnostic change.
	Reported by Andreas Hoenen in http://bugs.debian.org/570064.

2010-02-14  Juan Manuel Guerrero  <juan.guerrero@gmx.de>

	avoid compilation failure on systems lacking both fork and vfork
	* src/sdiff.c [!HAVE_WORKING_FORK && !HAVE_WORKING_VFORK] (main):
	Pass the right number of arguments to shell_quote_copy.
	* src/util.c [!HAVE_WORKING_FORK && !HAVE_WORKING_VFORK] (begin_output):
	Likewise.

2010-02-11  Jim Meyering  <meyering@redhat.com>

	post-release administrivia
	* NEWS: Add header line for next release.
	* .prev-version: Record previous version.
	* cfg.mk (old_NEWS_hash): Auto-update.

	version 2.9
	* NEWS: Record release date.

	doc: document the release procedure
	* README-release: New file.

2010-02-10  Jim Meyering  <meyering@redhat.com>

	maint: change use of "|" to more maintainable "||" (no semantic change)
	* src/analyze.c (diff_2_files): Using the "||" operator happens to
	be equivalent to using "|" in this case.  It is also clearer and
	less prone to inadvertent bug introduction, in case the variable,
	"changes" were ever to take on a value not in {0,1}.
	Patch by Tim Waugh, via Mike Frysinger.

	portability: avoid "diff - ..." failure at least on *BSD and Solaris
	The new "stdin" test was failing on many types of systems.
	* src/diff.c (compare_files): Guard use of xfreopen (NULL, "rb", ...
	also with O_BINARY, so as to avoid this unnecessary call on
	systems where it's not needed (on some it fails with "Bad address".

2010-02-09  Jim Meyering  <meyering@redhat.com>

	tests: honor VERBOSE
	* tests/basic: Enable "set -x" if $VERBOSE.
	* tests/help-version: Likewise.
	* tests/label-vs-func: Likewise.
	* tests/stdin: Likewise.

2010-02-04  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	sync with gnulib
	* gl/lib/regcomp.c.diff: Adjust to apply to the latest in gnulib.
	* gnulib: Update submodule to latest.

2010-02-04  Jim Meyering  <meyering@redhat.com>

	build: do not override gnulib-provided AM_CFLAGS options
	Avoid a warning from automake:
	lib/Makefile.am:23: AM_CFLAGS multiply defined in condition TRUE ...
	lib/gnulib.mk:30: ... `AM_CFLAGS' previously defined here
	lib/Makefile.am:18:   `lib/gnulib.mk' included from here

	* lib/Makefile.am (AM_CFLAGS): Append $(WARN_CFLAGS) and
	$(WERROR_CFLAGS), i.e., use "+=", not "=".
	This was introduced via 2009-12-17 commit e58efa5b
	"build: enable warnings and -Werror.",
	but fortunately is not a bug, because the definition
	it would have overridden was always empty.

2010-01-17  Jim Meyering  <meyering@redhat.com>

	maint: add to .gitignore
	* .gitignore: Ignore more.

2010-01-15  Jim Meyering  <meyering@redhat.com>

	doc: add to TODO
	* TODO: Add an item, suggested by Dan Jacobson.

2010-01-13  Jim Meyering  <meyering@redhat.com>

	tests: ensure that an argument of "-" is treated as standard input
	* tests/stdin: New test.
	* tests/Makefile.am (TESTS): Add it.

2010-01-10  Jim Meyering  <meyering@redhat.com>

	tests: now "make distcheck" runs more tests, incl. syntax-check
	* cfg.mk: Include dist-check.mk, from coreutils.
	* Makefile.am (distcheck-hook): Define rule, to hook to...
	* dist-check.mk: New file.

2010-01-09  Jim Meyering  <meyering@redhat.com>

	build: update gnulib to latest, for fixed syntax-check rule

	maint: record updated NEWS hash
	* cfg.mk (old_NEWS_hash): Update to account for GFDL change.

	build: update gnulib submodule to latest

	tests: add a test of basic functionality
	* tests/basic: Start adding tests.
	* tests/Makefile.am (TESTS): Add it.

	maint: udpate GFDL license to 1.3
	* doc/diff.texi: Update to use GFDL version 1.3.

2010-01-04  Eric Blake  <ebb9@byu.net>

	build: allow compilation on cygwin
	* src/Makefile.am (cmp_LDADD): Move LIBICONV...
	(LDADD): ...into global flags, since all programs need it.

2010-01-03  Jim Meyering  <meyering@redhat.com>

	maint: record update-copyright options for this package
	* cfg.mk: Next time, just run "make update-copyright".

	tests: prepend ../src, not "." to PATH
	* tests/help-version: Correct PATH.

2010-01-01  Jim Meyering  <meyering@redhat.com>

	maint: update all FSF copyright year lists to include 2010
	Use this command:
	git ls-files |grep -vE '^(\..*|COPYING|gnulib)$' |xargs \
	env UPDATE_COPYRIGHT_USE_INTERVALS=1 build-aux/update-copyright

2009-12-31  Jim Meyering  <meyering@redhat.com>

	maint: newer gnulib; don't hard-code my GPG key ID
	* cfg.mk (gpg_key_ID): Remove definition, now that maint.mk automates it.
	* gnulib: Update to latest.

	tests: exercise diff -p's function-name matching
	* tests/label-vs-func: New file.
	* tests/Makefile.am (TESTS): Add label-vs-func.
	Reported by Simon Arlott <simon@fire.lp0.eu>
	http://article.gmane.org/gmane.linux.kernel.janitors/14260

	tests: use gnulib's init.sh
	* tests/Makefile.am (EXTRA_DIST): Add init.sh.
	Remove test-lib.sh.
	* tests/init.sh: New file.
	* tests/test-lib.sh: Remove file.
	* tests/help-version: Use init.sh, not test-lib.sh.

2009-11-28  Jim Meyering  <meyering@redhat.com>

	maint: don't let trailing spaces in diffs perturb make syntax-check
	* .x-sc_space_tab: New file.

2009-11-22  Jim Meyering  <meyering@redhat.com>

	build: enable warnings and -Werror.
	* src/Makefile.am (AM_CFLAGS): Enable warnings and -Werror.
	Set to this: $(WARN_CFLAGS) $(WERROR_CFLAGS)
	* lib/Makefile.am (AM_CFLAGS): Similarly, but use this:
	$(GNULIB_WARN_CFLAGS) $(WERROR_CFLAGS)
	* configure.ac (GNULIB_WARN_CFLAGS): Don't turn off -Wuninitialized.

	build: avoid a warning from gnulib's sh-quote.c
	* gl/lib/sh-quote.c.diff: New file, to avoid a warning.

	maint: avoid warnings via patched versions of gnulib's regex functions
	* gl/lib/regcomp.c.diff: New file.
	* gl/lib/regex_internal.c.diff: Likewise.
	* gl/lib/regex_internal.h.diff: Likewise.
	* gl/lib/regexec.c.diff: Likewise.

	build: update gnulib submodule to latest

2009-11-20  Eric Blake  <ebb9@byu.net>

	build: ignore more files
	* .gitignore: Add config.cache, *.exe.

2009-11-20  Eric Blake  <ebb9@byu.net>

	build: fix test run on cygwin
	This, plus a gnulib update for xalloc-die-tests, are necessary
	for make check to pass on cygwin.

	* tests/Makefile.am (built_programs): Ignore $(EXEEXT).
	* src/Makefile.am (paths.h): Add missing dependency.

2009-11-20  Jim Meyering  <meyering@redhat.com>

	maint: remove vestiges of nanosleep
	* src/Makefile.am (LDADD): Remove $(LIB_NANOSLEEP), now
	that we no longer use the nanosleep module.
	Spotted by Eric Blake.

	maint: don't pull in gnulib's nanosleep unnecessarily
	* bootstrap.conf (gnulib_modules): Remove nanosleep.  Not needed.
	Spotted by Eric Blake.

	maint: cfg.mk: remove factored-out ftp host/dir definitions
	* cfg.mk (gnu_ftp_host-alpha, gnu_ftp_host-beta gnu_ftp_host-stable):
	(gnu_rel_host, url_dir_list): Remove definitions.  The defaults,
	now provided by maint.mk, are the same.
	* gnulib: Update for latest, including those maint.mk additions.

	build: link with now-required libraries
	* src/Makefile.am (LDADD): Add gnulib-required libraries.
	(cmp_LDADD): Add $(LIBICONV), for cmp's use of proper_name_utf8.

	maint: lib/xfreopen.c contains translatable strings
	* po/POTFILES.in: Add lib/xfreopen.c.

	maint: remove hard-coded macro definitions provided by intprops.h
	* lib/cmpbuf.c: Include "intprops.h" rather than open-coding macros
	like TYPE_SIGNED and TYPE_MINIMUM.

	maint: add gnulib's announce-gen module
	* bootstrap.conf (gnulib_modules): Add announce-gen

	build: suppress warnings about bindtextdomain and textdomain
	* src/system.h (bindtextdomain, textdomain) [!ENABLE_NLS]: Define away.

	build: use more gnulib modules
	* bootstrap.conf (gnulib_modules): Add mktime, nanosleep, strptime
	and timegm.

	use xfreopen rather than freopen
	* src/cmp.c: Include "xfreopen.h".
	Use xfreopen in place of freopen.
	* src/diff.c Likewise, and...
	(main): Set exit_failure to EXIT_TROUBLE, rather than to 2.
	* src/diff3.c: Likewise.
	* bootstrap.conf (gnulib_modules): Add xfreopen.

	build: enable many warnings
	* configure.ac: Add support for --enable-gcc-warnings.
	* bootstrap.conf (gnulib_modules): Add manywarnings.
	* Makefile.am (AM_CFLAGS): Add $(WARN_CFLAGS) $(WERROR_CFLAGS)

	build: update gnulib submodule to latest

	maint: add an assertion to suppress clang-detected warning
	The clang static analyzer reported that a NULL parent could be
	dereferenced.  However, that cannot happen, because for all callers,
	the parameter, parent, is always non-NULL at that point.
	* src/diff.c: Include <assert.h>.
	Assert that parent is not NULL.

	maint: remove dead assignment from diff3.c
	* src/diff3.c (make_3way_diff): Remove dead assignment.

2009-11-17  Jim Meyering  <meyering@redhat.com>

	build: update gnulib submodule to latest

	maint: hide build commands behind $(AM_V_GEN)
	* src/Makefile.am (paths.h): Use $(AM_V_GEN), and split a long line.
	* man/Makefile.am ($(dist_man1_MANS)): Use $(AM_V_GEN) here, too.

2009-11-16  Jim Meyering  <meyering@redhat.com>

	build: let automake generate better man-installation rules
	* man/Makefile.am (dist_man1_MANS): Rename from dist_man_MANS,
	to enable better automake-generated installation rules.

	admin: ignore all of gnulib-tests
	* .gitignore: Add gnulib-tests

2009-11-16  Eric Blake  <ebb9@byu.net>

	build: avoid link failure when libsigsegv is used
	* src/Makefile.am (LDADD): Link against LIBSIGSEGV.

2009-11-16  Jim Meyering  <meyering@redhat.com>

	maint: define/use PROGRAM_NAME and AUTHORS; use propername module
	* bootstrap.conf (gnulib_modules): Add propername.
	* src/cmp.c (PROGRAM_NAME, AUTHORS): Define.
	(main): Use them in use of version_etc.
	* src/diff.c (PROGRAM_NAME, AUTHORS, main): Likewise.
	* src/diff3.c (PROGRAM_NAME, AUTHORS, main): Likewise.
	* src/sdiff.c (PROGRAM_NAME, AUTHORS, main): Likewise.
	* src/system.h: Include "propername.h".

	maint: no longer define *_FILENO constants
	* src/system.h (STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO):
	Remove definitions.  Now guaranteed by gnulib.

	maint: bug-diffutils@gnu.org is the new bug-reporting address
	* configure.ac (AC_INIT): Use bug-diffutils@..., not bug-gnu-utils
	as the bug-reporting address.
	* NEWS (Administrivia): Mention this.
	* src/cmp.c (usage): Remove hard-coded address.
	Instead, use gnulib's emit_bug_reporting_address function.
	* src/diff.c (usage, option_help_msgid): Likewise.
	* src/diff3.c (usage): Likewise.
	* src/sdiff.c (usage): Likewise.

	sdiff, diff3: exec diff, not $(bindir)/diff
	* src/Makefile.am (paths.h): Emit a definition of DEFAULT_DIFF_PROGRAM
	that is simply "diff" (or whatever $(transform) would convert that to,
	e.g., "gdiff").  This makes it so that tests can work without first
	installing diff, and so that the binaries do not hard-code $(prefix).
	* NEWS (Changes in behavior): Mention this.

2009-11-14  Jim Meyering  <meyering@redhat.com>

	tests: add the first script; hook up gnulib-tests
	* configure.ac (AC_CONFIG_FILES): Add tests/Makefile and
	gnulib-tests/Makefile.
	* tests/help-version: New file, from coreutils.
	* tests/test-lib.sh: Likewise.
	* tests/Makefile.am: New file, from gzip.
	* Makefile.am (SUBDIRS): Add tests and gnulib-tests.
	* tests/t-local.sh: New, empty(for now) file.

2009-11-13  Jim Meyering  <meyering@redhat.com>

	build: require gettext-0.17
	* configure.ac: Require gettext-0.17; it was released two years ago.

	build: correct gettext configure-time support
	* configure.ac: Use AM_GNU_GETTEXT([external], [need-ngettext]),
	rather than AM_GNU_GETTEXT([external], [need-formatstring-macros]).
	Reported by Martin Jacobs in
	http://thread.gmane.org/gmane.comp.parsers.bison.bugs/3181

2009-11-12  Jim Meyering  <meyering@redhat.com>

	build: generalize autoheader check
	* bootstrap: Look for AC_CONFIG_HEADER as well as AC_CONFIG_HEADERS.

2009-11-11  Jim Meyering  <meyering@redhat.com>

	maint: use a git submodule for gnulib
	* .gitmodules: New file, to track gnulib.
	* gnulib: New file, created by running this:
	git submodule add git://git.sv.gnu.org/gnulib.git gnulib

	maint: tell git what it can ignore
	* .gitignore: Ignore generated files.