path: root/Makefile.maint

# -*-Makefile-*-
# This Makefile fragment is shared between the coreutils,
# CPPI, Bison, and Autoconf.

## Copyright (C) 2001-2007 Free Software Foundation, Inc.
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3, or (at your option)
## any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
## 02110-1301, USA.

# This is reported not to work with make-3.79.1
# ME := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
ME := Makefile.maint

# Do not save the original name or timestamp in the .tar.gz file.
# Use --rsyncable if available.
gzip_rsyncable := \
  $(shell gzip --help 2>/dev/null|grep rsyncable >/dev/null && echo --rsyncable)
GZIP_ENV = '--no-name --best $(gzip_rsyncable)'

CVS = cvs
GIT = git
VC = $(GIT)
VC-tag = git-tag -s -m '$(VERSION)'

CVS_LIST = build-aux/vc-list-files

CVS_LIST_EXCEPT = \
  $(CVS_LIST) | if test -f .x-$@; then grep -vEf .x-$@; else grep -v ChangeLog; fi

ifeq ($(origin prev_version_file), undefined)
  prev_version_file = .prev-version
endif

PREV_VERSION := $(shell cat $(prev_version_file))
VERSION_REGEXP = $(subst .,\.,$(VERSION))

tag-package = $(shell echo "$(PACKAGE)" | tr '[:lower:]' '[:upper:]')
tag-this-version = $(subst .,_,$(VERSION))
this-vc-tag = $(tag-package)-$(tag-this-version)
my_distdir = $(PACKAGE)-$(VERSION)

# Old releases are stored here.
# Used for diffs and xdeltas.
release_archive_dir ?= ../release

# Prevent programs like 'sort' from considering distinct strings to be equal.
# Doing it here saves us from having to set LC_ALL elsewhere in this file.
export LC_ALL = C



## --------------- ##
## Sanity checks.  ##
## --------------- ##

# FIXME: add a check to prohibit definition in src/*.c of symbols defined
# in system.h.  E.g. today I removed from tail.c a useless definition of
# ENOSYS.  It was useless because system.h ensures it's defined.

# Collect the names of rules starting with `sc_'.
syntax-check-rules := $(shell sed -n 's/^\(sc_[a-zA-Z0-9_-]*\):.*/\1/p' $(ME))
.PHONY: $(syntax-check-rules)

# Checks that don't require cvs.
# Run `changelog-check' last, as previous test may reveal problems requiring
# new ChangeLog entries.
local-checks-available = \
  po-check copyright-check m4-check author_mark_check \
  changelog-check patch-check strftime-check $(syntax-check-rules) \
  makefile_path_separator_check \
  makefile-check check-AUTHORS
.PHONY: $(local-checks-available)

local-check := $(filter-out $(local-checks-to-skip), $(local-checks-available))

syntax-check: $(local-check)
#	@grep -nE '#  *include <(limits|std(def|arg|bool))\.h>'		\
#	    $$(find -type f -name '*.[chly]') &&			\
#	  { echo '$(ME): found conditional include' 1>&2;		\
#	    exit 1; } || :

#	grep -nE '^#  *include <(string|stdlib)\.h>'			\
#	    $(srcdir)/{lib,src}/*.[chy] &&				\
#	  { echo '$(ME): FIXME' 1>&2;					\
#	    exit 1; } || :
# FIXME: don't allow `#include .strings\.h' anywhere

sc_cast_of_argument_to_free:
	@grep -nE '\<free \(\(' $$($(CVS_LIST_EXCEPT)) &&		\
	  { echo '$(ME): don'\''t cast free argument' 1>&2;		\
	    exit 1; } || :

sc_cast_of_x_alloc_return_value:
	@grep -nE '\*\) *x(m|c|re)alloc\>' $$($(CVS_LIST_EXCEPT)) &&	\
	  { echo '$(ME): don'\''t cast x*alloc return value' 1>&2;	\
	    exit 1; } || :

sc_cast_of_alloca_return_value:
	@grep -nE '\*\) *alloca\>' $$($(CVS_LIST_EXCEPT)) &&		\
	  { echo '$(ME): don'\''t cast alloca return value' 1>&2;	\
	    exit 1; } || :

sc_space_tab:
	@grep -n '[ ]	' $$($(CVS_LIST_EXCEPT)) &&			\
	  { echo '$(ME): found SPACE-TAB sequence; remove the SPACE'	\
		1>&2; exit 1; } || :

# Don't use *scanf or the old ato* functions in `real' code.
# They provide no error checking mechanism.
# Instead, use strto* functions.
sc_prohibit_atoi_atof:
	@grep -nE '\<([fs]?scanf|ato([filq]|ll))\>' $$($(CVS_LIST_EXCEPT)) && \
	  { echo '$(ME): do not use *scan''f, ato''f, ato''i, ato''l, ato''ll, ato''q, or ss''canf'	\
		1>&2; exit 1; } || :

# Use STREQ rather than comparing strcmp == 0, or != 0.
sc_prohibit_strcmp:
	@grep -nE '! *str''cmp \(|\<str''cmp \([^)]+\) *==' \
	    $$($(CVS_LIST_EXCEPT)) && \
	  { echo '$(ME): use STREQ in place of the above uses of str''cmp' \
		1>&2; exit 1; } || :

# Using EXIT_SUCCESS as the first argument to error is misleading,
# since when that parameter is 0, error does not exit.  Use `0' instead.
sc_error_exit_success:
	@grep -nF 'error (EXIT_SUCCESS,'				\
	    $$(find -type f -name '*.[chly]') &&			\
	  { echo '$(ME): found error (EXIT_SUCCESS' 1>&2;		\
	    exit 1; } || :

sc_file_system:
	@grep -ni 'file''system' $$($(CVS_LIST_EXCEPT)) &&		\
	  { echo '$(ME): found use of "file''system";'			\
	    'rewrite to use "file system"' 1>&2;			\
	    exit 1; } || :

sc_no_have_config_h:
	@grep -n 'HAVE''_CONFIG_H' $$($(CVS_LIST_EXCEPT)) &&		\
	  { echo '$(ME): found use of HAVE''_CONFIG_H; remove'		\
		1>&2; exit 1; } || :

# Nearly all .c files must include <config.h>.
sc_require_config_h:
	@if $(CVS_LIST_EXCEPT) | grep '\.c$$' > /dev/null; then		\
	  grep -L '^# *include <config\.h>'				\
		$$($(CVS_LIST_EXCEPT) | grep '\.c$$')			\
	      | grep . &&						\
	  { echo '$(ME): the above files do not include <config.h>'	\
		1>&2; exit 1; } || :;					\
	else :;								\
	fi

# Prohibit the inclusion of assert.h without an actual use of assert.
sc_prohibit_assert_without_use:
	@if $(CVS_LIST_EXCEPT) | grep '\.c$$' > /dev/null; then		\
	  files=$$(grep -l '# *include <assert\.h>'			\
		    $$($(CVS_LIST_EXCEPT) | grep '\.c$$')) &&		\
	  grep -L '\<assert (' $$files					\
	      | grep . &&						\
	    { echo "$(ME): the above files include <assert.h> but don't use it" \
		  1>&2; exit 1; } || :;					\
	else :;								\
	fi

# Don't include quotearg.h unless you use one of its functions.
sc_prohibit_quotearg_without_use:
	@if $(CVS_LIST_EXCEPT) | grep '\.c$$' > /dev/null; then		\
	  files=$$(grep -l '# *include "quotearg\.h"'			\
		    $$($(CVS_LIST_EXCEPT) | grep '\.c$$')) &&		\
	  grep -LE '\<quotearg(_[^ ]+)? \(' $$files			\
	      | grep . &&						\
	    { echo "$(ME): the above files include "quotearg.h" but don't use it" \
		  1>&2; exit 1; } || :;					\
	else :;								\
	fi

# Don't include quote.h unless you use one of its functions.
sc_prohibit_quote_without_use:
	@if $(CVS_LIST_EXCEPT) | grep '\.c$$' > /dev/null; then		\
	  files=$$(grep -l '# *include "quote\.h"'			\
		    $$($(CVS_LIST_EXCEPT) | grep '\.c$$')) &&		\
	  grep -LE '\<quote(_n)? \(' $$files			\
	      | grep . &&						\
	    { echo "$(ME): the above files include "quote.h" but don't use it" \
		  1>&2; exit 1; } || :;					\
	else :;								\
	fi

sc_obsolete_symbols:
	@grep -nE '\<(HAVE''_FCNTL_H|O''_NDELAY)\>'			\
	     $$($(CVS_LIST_EXCEPT)) &&					\
	  { echo '$(ME): do not use HAVE''_FCNTL_H or O''_NDELAY'	\
		1>&2; exit 1; } || :

# FIXME: warn about definitions of EXIT_FAILURE, EXIT_SUCCESS, STREQ

# Each nonempty line must start with a year number, or a TAB.
sc_changelog:
	@grep -n '^[^12	]' $$(find . -maxdepth 2 -name ChangeLog) &&	\
	  { echo '$(ME): found unexpected prefix in a ChangeLog' 1>&2;	\
	    exit 1; } || :

# Ensure that dd's definition of LONGEST_SYMBOL stays in sync
# with the strings from the two affected variables.
dd_c = $(srcdir)/src/dd.c
sc_dd_max_sym_length:
ifneq ($(wildcard $(dd_c)),)
	@len=$$( (sed -n '/conversions\[\] =$$/,/^};/p' $(dd_c);\
		 sed -n '/flags\[\] =$$/,/^};/p' $(dd_c) )	\
		|sed -n '/"/s/^[^"]*"\([^"]*\)".*/\1/p'		\
	      | wc --max-line-length);				\
	max=$$(sed -n '/^#define LONGEST_SYMBOL /s///p' $(dd_c)	\
	      |tr -d '"' | wc --max-line-length);		\
	if test "$$len" = "$$max"; then :; else			\
	  echo 'dd.c: LONGEST_SYMBOL is not longest' 1>&2;	\
	  exit 1;						\
	fi
endif

# Many m4 macros names once began with `jm_'.
# On 2004-04-13, they were all changed to start with gl_ instead.
# Make sure that none are inadvertently reintroduced.
sc_prohibit_jm_in_m4:
	@grep -nE 'jm_[A-Z]'					\
		$$($(CVS_LIST) m4 |grep '\.m4$$'; echo /dev/null) && \
	    { echo '$(ME): do not use jm_ in m4 macro names'	\
	      1>&2; exit 1; } || :

sc_root_tests:
	@if test -d tests \
	      && grep check-root tests/Makefile.am>/dev/null 2>&1; then \
	t1=sc-root.expected; t2=sc-root.actual;				\
	grep -nl '^PRIV_CHECK_ARG=require-root'				\
	  $$($(CVS_LIST) tests) |sed s,tests,., |sort > $$t1;		\
	sed -n 's,	cd \([^ ]*\) .*MAKE..check TESTS=\(.*\),./\1/\2,p' \
	  $(srcdir)/tests/Makefile.am |sort > $$t2;			\
	diff -u $$t1 $$t2 || diff=1;					\
	rm -f $$t1 $$t2;						\
	test "$$diff"							\
	  && { echo 'tests/Makefile.am: missing check-root action'>&2;	\
	       exit 1; } || :;						\
	fi

headers_with_interesting_macro_defs = \
  exit.h	\
  fcntl_.h	\
  fnmatch_.h	\
  intprops.h	\
  inttypes_.h	\
  lchown.h	\
  openat.h	\
  stat-macros.h	\
  stdint_.h

# Create a list of regular expressions matching the names
# of macros that are guaranteed by parts of gnulib to be defined.
.re-defmac:
	@(cd $(srcdir)/lib;						\
	  for f in $(headers_with_interesting_macro_defs); do		\
	    test -f $$f &&						\
	      sed -n '/^# *define \([^_ (][^ (]*\)[ (].*/s//\1/p' $$f;	\
	   done;							\
	 ) | sort -u							\
	   | grep -Ev 'ATTRIBUTE_NORETURN|SIZE_MAX'			\
	   | sed 's/^/^# *define /'					\
	  > $@-t
	@mv $@-t $@

# Don't define macros that we already get from gnulib header files.
sc_always_defined_macros: .re-defmac
	@if test -f $(srcdir)/src/system.h; then			\
	  trap 'rc=$$?; rm -f .re-defmac; exit $$rc' 0 1 2 3 15;	\
	  grep -f .re-defmac $$($(CVS_LIST))				\
	    && { echo '$(ME): define the above via some gnulib .h file'	\
		  1>&2;  exit 1; } || :;				\
	fi

# Create a list of regular expressions matching the names
# of files included from system.h.  Exclude a couple.
.re-list:
	@sed -n '/^# *include /s///p' $(srcdir)/src/system.h \
	  | grep -Ev 'sys/(param|file)\.h' \
	  | sed 's/ .*//;;s/^["<]/^# *include [<"]/;s/\.h[">]$$/\\.h[">]/' \
	  > $@-t
	@mv $@-t $@

# Files in src/ should not include directly any of
# the headers already included via system.h.
sc_system_h_headers: .re-list
	@if test -f $(srcdir)/src/system.h; then			\
	  trap 'rc=$$?; rm -f .re-list; exit $$rc' 0 1 2 3 15;		\
	  grep -nE -f .re-list						\
	      $$($(CVS_LIST) src |					\
		 grep -Ev '((copy|system)\.h|parse-gram\.c)$$')		\
	    && { echo '$(ME): the above are already included via system.h'\
		  1>&2;  exit 1; } || :;				\
	fi

sc_sun_os_names:
	@grep -nEi \
	    'solaris[^[:alnum:]]*2\.(7|8|9|[1-9][0-9])|sunos[^[:alnum:]][6-9]' \
	    $$($(CVS_LIST_EXCEPT)) &&					\
	  { echo '$(ME): found misuse of Sun OS version numbers' 1>&2;	\
	    exit 1; } || :

sc_the_the:
	@grep -ni '\<the ''the\>' $$($(CVS_LIST_EXCEPT)) &&		\
	  { echo '$(ME): found use of "the ''the";' 1>&2;		\
	    exit 1; } || :

sc_tight_scope:
	$(MAKE) -C src $@

sc_trailing_blank:
	@grep -n '[	 ]$$' $$($(CVS_LIST_EXCEPT)) &&			\
	  { echo '$(ME): found trailing blank(s)'			\
		1>&2; exit 1; } || :

# Match lines like the following, but where there is only one space
# between the options and the description:
#   -D, --all-repeated[=delimit-method]  print all duplicate lines\n
longopt_re = --[a-z][0-9A-Za-z-]*(\[?=[0-9A-Za-z-]*\]?)?
sc_two_space_separator_in_usage:
	@grep -nE '^   *(-[A-Za-z],)? $(longopt_re) [^ ].*\\$$'		\
	    $$($(CVS_LIST_EXCEPT)) &&					\
	  { echo "$(ME): help2man requires at least two spaces between"; \
	    echo "$(ME): an option and its description"; \
		1>&2; exit 1; } || :

# Look for diagnostics that aren't marked for translation.
# This won't find any for which error's format string is on a separate line.
sc_unmarked_diagnostics:
	@grep -nE							\
	    '\<error \([^"]*"[^"]*[a-z]{3}' $$($(CVS_LIST_EXCEPT))	\
	  | grep -v '_''(' &&						\
	  { echo '$(ME): found unmarked diagnostic(s)' 1>&2;		\
	    exit 1; } || :

# Avoid useless parentheses like those in this example:
# #if defined (SYMBOL) || defined (SYM2)
sc_useless_cpp_parens:
	@grep -n '^# *if .*defined *(' $$($(CVS_LIST_EXCEPT)) &&	\
	  { echo '$(ME): found useless parentheses in cpp directive'	\
		1>&2; exit 1; } || :

# Ensure that the c99-to-c89 patch applies cleanly.
patch-check:
	rm -rf src-c89 $@.1 $@.2
	cp -a src src-c89
	(cd src-c89; patch -p1 -V never --fuzz=0) < src/c99-to-c89.diff \
	  > $@.1 2>&1
	if test "$${REGEN_PATCH+set}" = set; then \
	  diff -upr src src-c89 | sed 's,src-c89/,src/,' > new-diff || : ; fi
	grep -v '^patching file ' $@.1 > $@.2 || :
	msg=ok; test -s $@.2 && msg='fuzzy patch' || : ;	\
	rm -f src-c89/*.o || msg='rm failed';			\
	$(MAKE) -C src-c89 CFLAGS='-Wdeclaration-after-statement -Werror' \
	  || msg='compile failure with extra options';		\
	rm -rf src-c89 $@.1 $@.2;				\
	test "$$msg" = ok && : || echo "$$msg" 1>&2;		\
	test "$$msg" = ok

# Ensure that date's --help output stays in sync with the info
# documentation for GNU strftime.  The only exception is %N,
# which date accepts but GNU strftime does not.
extract_char = sed 's/^[^%][^%]*%\(.\).*/\1/'
strftime-check:
	if test -f $(srcdir)/src/date.c; then				\
	  grep '^  %.  ' $(srcdir)/src/date.c | sort			\
	    | $(extract_char) > $@-src;					\
	  { echo N;							\
	    info libc date calendar format | grep '^    `%.'\'		\
	      | $(extract_char); } | sort > $@-info;			\
	  diff -u $@-src $@-info || exit 1;				\
	  rm -f $@-src $@-info;						\
	fi

check-AUTHORS:
	$(MAKE) -C src $@

# Ensure that we use only the standard $(VAR) notation,
# not @...@ in Makefile.am, now that we can rely on automake
# to emit a definition for each substituted variable.
makefile-check:
	grep -nE '@[A-Z_0-9]+@' `find . -name Makefile.am` \
	  && { echo 'Makefile.maint: use $$(...), not @...@' 1>&2; exit 1; } || :

news-date-check: NEWS
	today=`date +%Y-%m-%d`;						\
	if head NEWS | grep '^\*.* $(VERSION_REGEXP) ('$$today')'	\
	    >/dev/null; then						\
	  :;								\
	else								\
	  echo "version or today's date is not in NEWS" 1>&2;		\
	  exit 1;							\
	fi

changelog-check:
	if head ChangeLog | grep 'Version $(VERSION_REGEXP)\.$$'	\
	    >/dev/null; then						\
	  :;								\
	else								\
	  echo "$(VERSION) not in ChangeLog" 1>&2;			\
	  exit 1;							\
	fi

m4-check:
	@grep -n 'AC_DEFUN([^[]' m4/*.m4 \
	  && { echo 'Makefile.maint: quote the first arg to AC_DEFUN' 1>&2; \
	       exit 1; } || :

# Verify that all source files using _() are listed in po/POTFILES.in.
# FIXME: don't hard-code file names below; use a more general mechanism.
po-check:
	if test -f po/POTFILES.in; then					\
	  grep -E -v '^(#|$$)' po/POTFILES.in				\
	    | grep -v '^src/false\.c$$' | sort > $@-1;			\
	  files=;							\
	  for file in $$($(CVS_LIST_EXCEPT)) lib/*.[ch]; do		\
	    case $$file in						\
	    djgpp/* | man/*) continue;;					\
	    */c99-to-c89.diff) continue;;				\
	    esac;							\
	    case $$file in						\
	    *.[ch])							\
	      base=`expr " $$file" : ' \(.*\)\..'`;			\
	      { test -f $$base.l || test -f $$base.y; } && continue;;	\
	    esac;							\
	    files="$$files $$file";					\
	  done;								\
	  grep -E -l '\b(N?_|gettext *)\([^)"]*("|$$)' $$files		\
	    | sort -u > $@-2;						\
	  diff -u $@-1 $@-2 || exit 1;					\
	  rm -f $@-1 $@-2;						\
	fi

# In a definition of #define AUTHORS "... and ..." where the RHS contains
# the English word `and', the string must be marked with `N_ (...)' so that
# gettext recognizes it as a string requiring translation.
author_mark_check:
	@grep -n '^# *define AUTHORS "[^"]* and ' src/*.c |grep -v ' N_ (' && \
	  { echo 'Makefile.maint: enclose the above strings in N_ (...)' 1>&2; \
	    exit 1; } || :

# Sometimes it is useful to change the PATH environment variable
# in Makefiles.  When doing so, it's better not to use the Unix-centric
# path separator of `:', but rather the automake-provided `@PATH_SEPARATOR@'.
# It'd be better to use `find -print0 ...|xargs -0 ...', but less portable,
# and there probably aren't many projects with so many Makefile.am files
# that we'd have to worry about limits on command line length.
msg = 'Makefile.maint: Do not use `:'\'' above; use @PATH_SEPARATOR@ instead'
makefile_path_separator_check:
	@grep -n 'PATH=.*:' `find $(srcdir) -name Makefile.am` \
	  && { echo $(msg) 1>&2; exit 1; } || :

# Check that `make alpha' will not fail at the end of the process.
writable-files:
	if test -d $(release_archive_dir); then :; else			\
	  mkdir $(release_archive_dir);					\
	fi
	for file in $(distdir).tar.gz $(xd-delta)			\
	            $(release_archive_dir)/$(distdir).tar.gz		\
	            $(release_archive_dir)/$(xd-delta); do		\
	  test -e $$file || continue;					\
	  test -w $$file						\
	    || { echo ERROR: $$file is not writable; fail=1; };		\
	done;								\
	test "$$fail" && exit 1 || :

v_etc_file = lib/version-etc.c
sample-test = tests/sample-test
texi = doc/$(PACKAGE).texi
# Make sure that the copyright date in $(v_etc_file) is up to date.
# Do the same for the $(sample-test) and the main doc/.texi file.
copyright-check:
	@if test -f $(v_etc_file); then \
	  grep 'enum { COPYRIGHT_YEAR = '$$(date +%Y)' };' $(v_etc_file) \
	    >/dev/null \
	  || { echo 'out of date copyright in $(v_etc_file); update it' 1>&2; \
	       exit 1; }; \
	fi
	@if test -f $(sample-test); then \
	  grep '# Copyright (C) '$$(date +%Y)' Free' $(sample-test) \
	    >/dev/null \
	  || { echo 'out of date copyright in $(sample-test); update it' 1>&2; \
	       exit 1; }; \
	fi
	@if test -f $(texi); then \
	  grep 'Copyright @copyright{} .*'$$(date +%Y)' Free' $(texi) \
	    >/dev/null \
	  || { echo 'out of date copyright in $(texi); update it' 1>&2; \
	       exit 1; }; \
	fi


# Sanity checks with the repository.
# Abort early if this tag has already been used.
vc-tag-check:
	used=no;							\
	if $(VC) --help | grep CVS; then				\
	  $(CVS) -n log -h README|grep -e $(this-vc-tag): >/dev/null	\
	    && used=yes;						\
	else								\
	  $(GIT) tag -l '^$(this-vc-tag)$$' && used=yes;		\
	fi;								\
	if test "$$used" = yes; then					\
	  echo "$(this-vc-tag) has already been used; not tagging" 1>&2; \
	  exit 1;							\
	fi

vc-diff-check:
	$(VC) diff > vc-diffs || :
	if test -s vc-diffs; then				\
	  cat vc-diffs;						\
	  echo "Some files are locally modified:" 1>&2;		\
	  exit 1;						\
	else							\
	  rm vc-diffs;						\
	fi

cvs-check: vc-diff-check vc-tag-check

maintainer-distcheck:
	$(MAKE) distcheck
	$(MAKE) my-distcheck


# Tag before making distribution.  Also, don't make a distribution if
# checks fail.  Also, make sure the NEWS file is up-to-date.
# FIXME: use dist-hook/my-dist like distcheck-hook/my-distcheck.
vc-dist: $(local-check) cvs-check maintainer-distcheck
	$(VC-tag) $(this-vc-tag)
	$(MAKE) dist

# Use this to make sure we don't run these programs when building
# from a virgin tgz file, below.
null_AM_MAKEFLAGS = \
  ACLOCAL=false \
  AUTOCONF=false \
  AUTOMAKE=false \
  AUTOHEADER=false \
  MAKEINFO=false

warn_cflags = -Dlint -O -Werror -Wall -Wformat -Wshadow -Wpointer-arith

# Use -Wformat -Werror to detect format-string/arg-list mismatches.
# Also, check for shadowing problems with -Wshadow, and for pointer
# arithmetic problems with -Wpointer-arith.
# These CFLAGS are pretty strict.  If you build this target, you probably
# have to have a recent version of gcc and glibc headers.
TMPDIR ?= /tmp
t=$(TMPDIR)/$(PACKAGE)/test
my-distcheck: $(local-check) $(release_archive_dir)/$(prev-tgz)
	-rm -rf $(t)
	mkdir -p $(t)
	GZIP=$(GZIP_ENV) $(AMTAR) -C $(t) -zxf $(distdir).tar.gz
	cd $(t)/$(distdir)				\
	  && ./configure --disable-nls			\
	  && $(MAKE) CFLAGS='$(warn_cflags)'		\
	      AM_MAKEFLAGS='$(null_AM_MAKEFLAGS)'	\
	  && $(MAKE) dvi				\
	  && $(MAKE) check				\
	  && $(MAKE) distclean
	(cd $(t) && mv $(distdir) $(distdir).old	\
	  && $(AMTAR) -zxf - ) < $(distdir).tar.gz
	diff -ur $(t)/$(distdir).old $(t)/$(distdir)
	if test -f $(srcdir)/src/c99-to-c89.diff; then			\
	  cd $(t)/$(distdir)						\
	    && (cd src && patch -V never --fuzz=0 <c99-to-c89.diff)	\
	    && ./configure --disable-largefile				\
	         CFLAGS='-Werror -ansi -Wno-long-long'			\
	    && $(MAKE);							\
	fi
	-rm -rf $(t)
	@echo "========================"; \
	echo "$(distdir).tar.gz is ready for distribution"; \
	echo "========================"

WGET = wget
WGETFLAGS = -C off

rel-check:
	tarz=/tmp/rel-check-tarz-$$$$; \
	md5_tmp=/tmp/rel-check-md5-$$$$; \
	set -e; \
	trap 'status=$$?; rm -f $$tarz $$md5_tmp; exit $$status' 0 1 2 3 15; \
	$(WGET) $(WGETFLAGS) -q --output-document=$$tarz $(url); \
	echo "$(md5)  -" > $$md5_tmp; \
	md5sum -c $$md5_tmp < $$tarz

prev-tgz = $(PACKAGE)-$(PREV_VERSION).tar.gz
xd-delta = $(PACKAGE)-$(PREV_VERSION)-$(VERSION).xdelta

rel-files = $(xd-delta) $(DIST_ARCHIVES)

# Approximate the date of last gnulib "update" by the ChangeLog file's
# mtime, and provide that date in the announcement.
announcement: NEWS ChangeLog $(rel-files)
	@cl_date=$$(stat --printf @%Y $(gnulib_dir)/ChangeLog);		\
	utc_date=$$(date -u --date $$cl_date '+%Y-%m-%d %T %z');	\
	./build-aux/announce-gen					\
	    --release-type=$(RELEASE_TYPE)				\
	    --package=$(PACKAGE)					\
	    --prev=$(PREV_VERSION)					\
	    --curr=$(VERSION)						\
	    --gpg-key-id=$(gpg_key_ID)					\
	    --news=NEWS							\
	    --bootstrap-tools=autoconf,automake,bison,gnulib		\
	    --gnulib-snapshot-time-stamp="$$utc_date"			\
	    $(addprefix --url-dir=, $(url_dir_list))

## ---------------- ##
## Updating files.  ##
## ---------------- ##

ftp-gnu = ftp://ftp.gnu.org/gnu
www-gnu = http://www.gnu.org

# Use mv, if you don't have/want move-if-change.
move_if_change ?= move-if-change

emit_upload_commands:
	@echo =====================================
	@echo =====================================
	@echo "$(srcdir)/build-aux/gnupload $(GNUPLOADFLAGS) \\"
	@echo "    --to $(gnu_rel_host):$(PACKAGE) \\"
	@echo "  $(rel-files)"
	@echo '# send the /tmp/announcement e-mail'
	@echo =====================================
	@echo =====================================

$(xd-delta): $(release_archive_dir)/$(prev-tgz) $(distdir).tar.gz
	xdelta delta -9 $^ $@ || :

.PHONY: alpha beta major
alpha beta major: news-date-check changelog-check $(local-check) writable-files
	test $@ = major						\
	  && { echo $(VERSION) | grep -E '^[0-9]+(\.[0-9]+)+$$'	\
	       || { echo "invalid version string: $(VERSION)" 1>&2; exit 1;};}\
	  || :
	$(MAKE) vc-dist
	$(MAKE) $(xd-delta)
	$(MAKE) -s announcement RELEASE_TYPE=$@ > /tmp/announce-$(my_distdir)
	ln $(rel-files) $(release_archive_dir)
	chmod a-w $(rel-files)
	$(MAKE) -s emit_upload_commands RELEASE_TYPE=$@
	echo $(VERSION) > $(prev_version_file)
	$(VC) commit -m \
	  '$(prev_version_file): Record previous version: $(VERSION).' \
	  $(prev_version_file)