maint.mk

   1 # -*-Makefile-*-
   2 # This Makefile fragment tries to be general-purpose enough to be
   3 # used by many projects via the gnulib maintainer-makefile module.
   4
   5 ## Copyright (C) 2001-2010 Free Software Foundation, Inc.
   6 ##
   7 ## This program is free software: you can redistribute it and/or modify
   8 ## it under the terms of the GNU General Public License as published by
   9 ## the Free Software Foundation, either version 3 of the License, or
  10 ## (at your option) any later version.
  11 ##
  12 ## This program is distributed in the hope that it will be useful,
  13 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 ## GNU General Public License for more details.
  16 ##
  17 ## You should have received a copy of the GNU General Public License
  18 ## along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 # This is reported not to work with make-3.79.1
  21 # ME := $(word $(words $(MAKEFILE_LIST)),$(MAKEFILE_LIST))
  22 ME := maint.mk
  23
  24 # Override this in cfg.mk if you use a non-standard build-aux directory.
  25 build_aux ?= $(srcdir)/build-aux
  26
  27 # Do not save the original name or timestamp in the .tar.gz file.
  28 # Use --rsyncable if available.
  29 gzip_rsyncable := \
  30   $(shell gzip --help 2>/dev/null|grep rsyncable >/dev/null && echo --rsyncable)
  31 GZIP_ENV = '--no-name --best $(gzip_rsyncable)'
  32
  33 GIT = git
  34 VC = $(GIT)
  35 VC-tag = git tag -s -m '$(VERSION)' -u '$(gpg_key_ID)'
  36
  37 VC_LIST = $(build_aux)/vc-list-files -C $(srcdir)
  38
  39 # You can override this variable in cfg.mk to set your own regexp
  40 # matching files to ignore.
  41 VC_LIST_ALWAYS_EXCLUDE_REGEX ?= ^$$
  42
  43 # This is to preprocess robustly the output of $(VC_LIST), so that even
  44 # when $(srcdir) is a pathological name like "....", the leading sed command
  45 # removes only the intended prefix.
  46 _dot_escaped_srcdir = $(subst .,\.,$(srcdir))
  47
  48 # Post-process $(VC_LIST) output, prepending $(srcdir)/, but only
  49 # when $(srcdir) is not ".".
  50 ifeq ($(srcdir),.)
  51 _prepend_srcdir_prefix =
  52 else
  53 _prepend_srcdir_prefix = | sed 's|^|$(srcdir)/|'
  54 endif
  55
  56 # In order to be able to consistently filter "."-relative names,
  57 # (i.e., with no $(srcdir) prefix), this definition is careful to
  58 # remove any $(srcdir) prefix, and to restore what it removes.
  59 VC_LIST_EXCEPT = \
  60   $(VC_LIST) | sed 's|^$(_dot_escaped_srcdir)/||' \
  61         | if test -f $(srcdir)/.x-$@; then grep -vEf $(srcdir)/.x-$@; \
  62           else grep -Ev -e "$${VC_LIST_EXCEPT_DEFAULT-ChangeLog}"; fi \
  63         | grep -Ev -e '$(VC_LIST_ALWAYS_EXCLUDE_REGEX)' \
  64         $(_prepend_srcdir_prefix)
  65
  66 ifeq ($(origin prev_version_file), undefined)
  67   prev_version_file = $(srcdir)/.prev-version
  68 endif
  69
  70 PREV_VERSION := $(shell cat $(prev_version_file) 2>/dev/null)
  71 VERSION_REGEXP = $(subst .,\.,$(VERSION))
  72 PREV_VERSION_REGEXP = $(subst .,\.,$(PREV_VERSION))
  73
  74 ifeq ($(VC),$(GIT))
  75 this-vc-tag = v$(VERSION)
  76 this-vc-tag-regexp = v$(VERSION_REGEXP)
  77 else
  78 tag-package = $(shell echo "$(PACKAGE)" | tr '[:lower:]' '[:upper:]')
  79 tag-this-version = $(subst .,_,$(VERSION))
  80 this-vc-tag = $(tag-package)-$(tag-this-version)
  81 this-vc-tag-regexp = $(this-vc-tag)
  82 endif
  83 my_distdir = $(PACKAGE)-$(VERSION)
  84
  85 # Old releases are stored here.
  86 release_archive_dir ?= ../release
  87
  88 # Override gnu_rel_host and url_dir_list in cfg.mk if these are not right.
  89 # Use alpha.gnu.org for alpha and beta releases.
  90 # Use ftp.gnu.org for stable releases.
  91 gnu_ftp_host-alpha = alpha.gnu.org
  92 gnu_ftp_host-beta = alpha.gnu.org
  93 gnu_ftp_host-stable = ftp.gnu.org
  94 gnu_rel_host ?= $(gnu_ftp_host-$(RELEASE_TYPE))
  95
  96 ifeq ($(gnu_rel_host),ftp.gnu.org)
  97 url_dir_list ?= http://ftpmirror.gnu.org/$(PACKAGE)
  98 else
  99 url_dir_list ?= ftp://$(gnu_rel_host)/gnu/$(PACKAGE)
 100 endif
 101
 102 # Override this in cfg.mk if you are using a different format in your
 103 # NEWS file.
 104 today = $(shell date +%Y-%m-%d)
 105 news-check-regexp ?= '^\*.* $(VERSION_REGEXP) \($(today)\)'
 106
 107 # Prevent programs like 'sort' from considering distinct strings to be equal.
 108 # Doing it here saves us from having to set LC_ALL elsewhere in this file.
 109 export LC_ALL = C
 110
 111 ## --------------- ##
 112 ## Sanity checks.  ##
 113 ## --------------- ##
 114
 115 _cfg_mk := $(shell test -f $(srcdir)/cfg.mk && echo '$(srcdir)/cfg.mk')
 116
 117 # Collect the names of rules starting with `sc_'.
 118 syntax-check-rules := $(sort $(shell sed -n 's/^\(sc_[a-zA-Z0-9_-]*\):.*/\1/p' \
 119                         $(srcdir)/$(ME) $(_cfg_mk)))
 120 .PHONY: $(syntax-check-rules)
 121
 122 local-checks-available = \
 123   $(syntax-check-rules)
 124 .PHONY: $(local-checks-available)
 125
 126 # Arrange to print the name of each syntax-checking rule just before running it.
 127 $(syntax-check-rules): %: %.m
 128 $(patsubst %, %.m, $(syntax-check-rules)):
 129         @echo $(patsubst sc_%.m, %, $@)
 130
 131 local-check := $(filter-out $(local-checks-to-skip), $(local-checks-available))
 132
 133 syntax-check: $(local-check)
 134 #       @grep -nE '#  *include <(limits|std(def|arg|bool))\.h>'         \
 135 #           $$(find -type f -name '*.[chly]') &&                        \
 136 #         { echo '$(ME): found conditional include' 1>&2;               \
 137 #           exit 1; } || :
 138
 139 #       grep -nE '^#  *include <(string|stdlib)\.h>'                    \
 140 #           $(srcdir)/{lib,src}/*.[chy] &&                              \
 141 #         { echo '$(ME): FIXME' 1>&2;                                   \
 142 #           exit 1; } || :
 143 # FIXME: don't allow `#include .strings\.h' anywhere
 144
 145 # By default, _prohibit_regexp does not ignore case.
 146 export ignore_case =
 147 _ignore_case = $$(test -n "$$ignore_case" && echo -i || :)
 148
 149 # There are many rules below that prohibit constructs in this package.
 150 # If the offending construct can be matched with a grep-E-style regexp,
 151 # use this macro.  The shell variables "re" and "msg" must be defined.
 152 define _prohibit_regexp
 153   dummy=; : so we do not need a semicolon before each use;              \
 154   test "x$$re" != x || { echo '$(ME): re not defined' 1>&2; exit 1; };  \
 155   test "x$$msg" != x || { echo '$(ME): msg not defined' 1>&2; exit 1; };\
 156   grep $(_ignore_case) -nE "$$re" $$($(VC_LIST_EXCEPT)) &&              \
 157     { echo '$(ME): '"$$msg" 1>&2; exit 1; } || :
 158 endef
 159
 160 sc_avoid_if_before_free:
 161         @$(build_aux)/useless-if-before-free                            \
 162                 $(useless_free_options)                                 \
 163             $$($(VC_LIST_EXCEPT) | grep -v useless-if-before-free) &&   \
 164           { echo '$(ME): found useless "if" before "free" above' 1>&2;  \
 165             exit 1; } || :
 166
 167 sc_cast_of_argument_to_free:
 168         @re='\<free *\( *\(' msg='don'\''t cast free argument'          \
 169           $(_prohibit_regexp)
 170
 171 sc_cast_of_x_alloc_return_value:
 172         @re='\*\) *x(m|c|re)alloc\>'                                    \
 173         msg='don'\''t cast x*alloc return value'                        \
 174           $(_prohibit_regexp)
 175
 176 sc_cast_of_alloca_return_value:
 177         @re='\*\) *alloca\>' msg='don'\''t cast alloca return value'    \
 178           $(_prohibit_regexp)
 179
 180 sc_space_tab:
 181         @re='[ ]        ' msg='found SPACE-TAB sequence; remove the SPACE' \
 182           $(_prohibit_regexp)
 183
 184 # Don't use *scanf or the old ato* functions in `real' code.
 185 # They provide no error checking mechanism.
 186 # Instead, use strto* functions.
 187 sc_prohibit_atoi_atof:
 188         @re='\<([fs]?scanf|ato([filq]|ll)) *\('                         \
 189         msg='do not use *scan''f, ato''f, ato''i, ato''l, ato''ll or ato''q' \
 190           $(_prohibit_regexp)
 191
 192 # Use STREQ rather than comparing strcmp == 0, or != 0.
 193 sc_prohibit_strcmp:
 194         @grep -nE '! *str''cmp *\(|\<str''cmp *\([^)]+\) *=='           \
 195             $$($(VC_LIST_EXCEPT))                                       \
 196           | grep -vE ':# *define STREQ\(' &&                            \
 197           { echo '$(ME): use STREQ in place of the above uses of str''cmp' \
 198                 1>&2; exit 1; } || :
 199
 200 # Pass EXIT_*, not number, to usage, exit, and error (when exiting)
 201 # Convert all uses automatically, via these two commands:
 202 # git grep -l '\<exit *(1)' \
 203 #  | grep -vEf .x-sc_prohibit_magic_number_exit \
 204 #  | xargs --no-run-if-empty \
 205 #      perl -pi -e 's/(^|[^.])\b(exit ?)\(1\)/$1$2(EXIT_FAILURE)/'
 206 # git grep -l '\<exit *(0)' \
 207 #  | grep -vEf .x-sc_prohibit_magic_number_exit \
 208 #  | xargs --no-run-if-empty \
 209 #      perl -pi -e 's/(^|[^.])\b(exit ?)\(0\)/$1$2(EXIT_SUCCESS)/'
 210 sc_prohibit_magic_number_exit:
 211         @re='(^|[^.])\<(usage|exit) ?\([0-9]|\<error ?\([1-9][0-9]*,'   \
 212         msg='use EXIT_* values rather than magic number'                \
 213           $(_prohibit_regexp)
 214
 215 # Using EXIT_SUCCESS as the first argument to error is misleading,
 216 # since when that parameter is 0, error does not exit.  Use `0' instead.
 217 sc_error_exit_success:
 218         @grep -nE 'error \(EXIT_SUCCESS,'                               \
 219             $$($(VC_LIST_EXCEPT) | grep -E '\.[chly]$$') &&             \
 220           { echo '$(ME): found error (EXIT_SUCCESS' 1>&2; exit 1; } || :
 221
 222 # `FATAL:' should be fully upper-cased in error messages
 223 # `WARNING:' should be fully upper-cased, or fully lower-cased
 224 sc_error_message_warn_fatal:
 225         @grep -nEA2 '[^rp]error \(' $$($(VC_LIST_EXCEPT))               \
 226             | grep -E '"Warning|"Fatal|"fatal' &&                       \
 227           { echo '$(ME): use FATAL, WARNING or warning' 1>&2;           \
 228             exit 1; } || :
 229
 230 # Error messages should not start with a capital letter
 231 sc_error_message_uppercase:
 232         @grep -nEA2 '[^rp]error \(' $$($(VC_LIST_EXCEPT))               \
 233             | grep -E '"[A-Z]'                                          \
 234             | grep -vE '"FATAL|"WARNING|"Java|"C#|PRIuMAX' &&           \
 235           { echo '$(ME): found capitalized error message' 1>&2;         \
 236             exit 1; } || :
 237
 238 # Error messages should not end with a period
 239 sc_error_message_period:
 240         @grep -nEA2 '[^rp]error \(' $$($(VC_LIST_EXCEPT))               \
 241             | grep -E '[^."]\."' &&                                     \
 242           { echo '$(ME): found error message ending in period' 1>&2;    \
 243             exit 1; } || :
 244
 245 sc_file_system:
 246         @re=file''system ignore_case=1                                  \
 247         msg='found use of "file''system"; spell it "file system"'       \
 248           $(_prohibit_regexp)
 249
 250 # Don't use cpp tests of this symbol.  All code assumes config.h is included.
 251 sc_prohibit_have_config_h:
 252         @grep -n '^# *if.*HAVE''_CONFIG_H' $$($(VC_LIST_EXCEPT)) &&     \
 253           { echo '$(ME): found use of HAVE''_CONFIG_H; remove'          \
 254                 1>&2; exit 1; } || :
 255
 256 # Nearly all .c files must include <config.h>.  However, we also permit this
 257 # via inclusion of a package-specific header, if cfg.mk specified one.
 258 # config_h_header must be suitable for grep -E.
 259 config_h_header ?= <config\.h>
 260 sc_require_config_h:
 261         @if $(VC_LIST_EXCEPT) | grep -l '\.c$$' > /dev/null; then       \
 262           grep -EL '^# *include $(config_h_header)'                     \
 263                 $$($(VC_LIST_EXCEPT) | grep '\.c$$')                    \
 264               | grep . &&                                               \
 265           { echo '$(ME): the above files do not include <config.h>'     \
 266                 1>&2; exit 1; } || :;                                   \
 267         else :;                                                         \
 268         fi
 269
 270 # You must include <config.h> before including any other header file.
 271 # This can possibly be via a package-specific header, if given by cfg.mk.
 272 sc_require_config_h_first:
 273         @if $(VC_LIST_EXCEPT) | grep -l '\.c$$' > /dev/null; then       \
 274           fail=0;                                                       \
 275           for i in $$($(VC_LIST_EXCEPT) | grep '\.c$$'); do             \
 276             grep '^# *include\>' $$i | sed 1q                           \
 277                 | grep -E '^# *include $(config_h_header)' > /dev/null  \
 278               || { echo $$i; fail=1; };                                 \
 279           done;                                                         \
 280           test $$fail = 1 &&                                            \
 281             { echo '$(ME): the above files include some other header'   \
 282                 'before <config.h>' 1>&2; exit 1; } || :;               \
 283         else :;                                                         \
 284         fi
 285
 286 sc_prohibit_HAVE_MBRTOWC:
 287         @re='\bHAVE_MBRTOWC\b' msg="do not use $$re; it is always defined" \
 288           $(_prohibit_regexp)
 289
 290 # To use this "command" macro, you must first define two shell variables:
 291 # h: the header, enclosed in <> or ""
 292 # re: a regular expression that matches IFF something provided by $h is used.
 293 define _header_without_use
 294   dummy=; : so we do not need a semicolon before each use;              \
 295   h_esc=`echo "$$h"|sed 's/\./\\\\./g'`;                                \
 296   if $(VC_LIST_EXCEPT) | grep -l '\.c$$' > /dev/null; then              \
 297     files=$$(grep -l '^# *include '"$$h_esc"                            \
 298              $$($(VC_LIST_EXCEPT) | grep '\.c$$')) &&                   \
 299     grep -LE "$$re" $$files | grep . &&                                 \
 300       { echo "$(ME): the above files include $$h but don't use it"      \
 301         1>&2; exit 1; } || :;                                           \
 302   else :;                                                               \
 303   fi
 304 endef
 305
 306 # Prohibit the inclusion of assert.h without an actual use of assert.
 307 sc_prohibit_assert_without_use:
 308         @h='<assert.h>' re='\<assert *\(' $(_header_without_use)
 309
 310 # Prohibit the inclusion of close-stream.h without an actual use.
 311 sc_prohibit_close_stream_without_use:
 312         @h='"close-stream.h"' re='\<close_stream *\(' $(_header_without_use)
 313
 314 # Prohibit the inclusion of getopt.h without an actual use.
 315 sc_prohibit_getopt_without_use:
 316         @h='<getopt.h>' re='\<getopt(_long)? *\(' $(_header_without_use)
 317
 318 # Don't include quotearg.h unless you use one of its functions.
 319 sc_prohibit_quotearg_without_use:
 320         @h='"quotearg.h"' re='\<quotearg(_[^ ]+)? *\(' $(_header_without_use)
 321
 322 # Don't include quote.h unless you use one of its functions.
 323 sc_prohibit_quote_without_use:
 324         @h='"quote.h"' re='\<quote(_n)? *\(' $(_header_without_use)
 325
 326 # Don't include this header unless you use one of its functions.
 327 sc_prohibit_long_options_without_use:
 328         @h='"long-options.h"' re='\<parse_long_options *\(' \
 329           $(_header_without_use)
 330
 331 # Don't include this header unless you use one of its functions.
 332 sc_prohibit_inttostr_without_use:
 333         @h='"inttostr.h"' re='\<(off|[iu]max|uint)tostr *\(' \
 334           $(_header_without_use)
 335
 336 # Don't include this header unless you use one of its functions.
 337 sc_prohibit_ignore_value_without_use:
 338         @h='"ignore-value.h"' re='\<ignore_(value|ptr) *\(' \
 339           $(_header_without_use)
 340
 341 # Don't include this header unless you use one of its functions.
 342 sc_prohibit_error_without_use:
 343         @h='"error.h"' \
 344         re='\<error(_at_line|_print_progname|_one_per_line|_message_count)? *\('\
 345           $(_header_without_use)
 346
 347 # Don't include xalloc.h unless you use one of its functions.
 348 # Consider these symbols:
 349 # perl -lne '/^# *define (\w+)\(/ and print $1' lib/xalloc.h|grep -v '^__';
 350 # perl -lne '/^(?:extern )?(?:void|char) \*?(\w+) \(/ and print $1' lib/xalloc.h
 351 # Divide into two sets on case, and filter each through this:
 352 # | sort | perl -MRegexp::Assemble -le \
 353 #  'print Regexp::Assemble->new(file => "/dev/stdin")->as_string'|sed 's/\?://g'
 354 # Note this was produced by the above:
 355 # _xa1 = \
 356 #x(((2n?)?re|c(har)?|n(re|m)|z)alloc|alloc_(oversized|die)|m(alloc|emdup)|strdup)
 357 # But we can do better, in at least two ways:
 358 # 1) take advantage of two "dup"-suffixed strings:
 359 # x(((2n?)?re|c(har)?|n(re|m)|[mz])alloc|alloc_(oversized|die)|(mem|str)dup)
 360 # 2) notice that "c(har)?|[mz]" is equivalent to the shorter and more readable
 361 # "char|[cmz]"
 362 # x(((2n?)?re|char|n(re|m)|[cmz])alloc|alloc_(oversized|die)|(mem|str)dup)
 363 _xa1 = x(((2n?)?re|char|n(re|m)|[cmz])alloc|alloc_(oversized|die)|(mem|str)dup)
 364 _xa2 = X([CZ]|N?M)ALLOC
 365 sc_prohibit_xalloc_without_use:
 366         @h='"xalloc.h"' \
 367         re='\<($(_xa1)|$(_xa2)) *\('\
 368           $(_header_without_use)
 369
 370 sc_prohibit_safe_read_without_use:
 371         @h='"safe-read.h"' re='(\<SAFE_READ_ERROR\>|\<safe_read *\()' \
 372           $(_header_without_use)
 373
 374 sc_prohibit_argmatch_without_use:
 375         @h='"argmatch.h"' \
 376         re='(\<(ARRAY_CARDINALITY|X?ARGMATCH(|_TO_ARGUMENT|_VERIFY))\>|\<argmatch(_exit_fn|_(in)?valid) *\()' \
 377           $(_header_without_use)
 378
 379 sc_prohibit_canonicalize_without_use:
 380         @h='"canonicalize.h"' \
 381         re='CAN_(EXISTING|ALL_BUT_LAST|MISSING)|canonicalize_(mode_t|filename_mode)' \
 382           $(_header_without_use)
 383
 384 sc_prohibit_root_dev_ino_without_use:
 385         @h='"root-dev-ino.h"' \
 386         re='(\<ROOT_DEV_INO_(CHECK|WARN)\>|\<get_root_dev_ino *\()' \
 387           $(_header_without_use)
 388
 389 sc_prohibit_openat_without_use:
 390         @h='"openat.h"' \
 391         re='\<(openat_(permissive|needs_fchdir|(save|restore)_fail)|l?(stat|ch(own|mod))at|(euid)?accessat)\>' \
 392           $(_header_without_use)
 393
 394 # Prohibit the inclusion of c-ctype.h without an actual use.
 395 ctype_re = isalnum|isalpha|isascii|isblank|iscntrl|isdigit|isgraph|islower\
 396 |isprint|ispunct|isspace|isupper|isxdigit|tolower|toupper
 397 sc_prohibit_c_ctype_without_use:
 398         @h='[<"]c-ctype.h[">]' re='\<c_($(ctype_re)) *\(' $(_header_without_use)
 399
 400 _empty =
 401 _sp = $(_empty) $(_empty)
 402 # The following list was generated by running:
 403 # man signal.h|col -b|perl -ne '/bsd_signal.*;/.../sigwaitinfo.*;/ and print' \
 404 #   | perl -lne '/^\s+(?:int|void).*?(\w+).*/ and print $1' | fmt
 405 _sig_functions = \
 406   bsd_signal kill killpg pthread_kill pthread_sigmask raise sigaction \
 407   sigaddset sigaltstack sigdelset sigemptyset sigfillset sighold sigignore \
 408   siginterrupt sigismember signal sigpause sigpending sigprocmask sigqueue \
 409   sigrelse sigset sigsuspend sigtimedwait sigwait sigwaitinfo
 410 _sig_function_re = $(subst $(_sp),|,$(strip $(_sig_functions)))
 411 # The following were extracted from "man signal.h" manually.
 412 _sig_types_and_consts =                                                 \
 413   MINSIGSTKSZ SA_NOCLDSTOP SA_NOCLDWAIT SA_NODEFER SA_ONSTACK           \
 414   SA_RESETHAND SA_RESTART SA_SIGINFO SIGEV_NONE SIGEV_SIGNAL            \
 415   SIGEV_THREAD SIGSTKSZ SIG_BLOCK SIG_SETMASK SIG_UNBLOCK SS_DISABLE    \
 416   SS_ONSTACK mcontext_t pid_t sig_atomic_t sigevent siginfo_t sigset_t  \
 417   sigstack sigval stack_t ucontext_t
 418 # generated via this:
 419 # perl -lne '/^#ifdef (SIG\w+)/ and print $1' lib/sig2str.c|sort -u|fmt -70
 420 _sig_names =                                                            \
 421   SIGABRT SIGALRM SIGALRM1 SIGBUS SIGCANCEL SIGCHLD SIGCLD SIGCONT      \
 422   SIGDANGER SIGDIL SIGEMT SIGFPE SIGFREEZE SIGGRANT SIGHUP SIGILL       \
 423   SIGINFO SIGINT SIGIO SIGIOT SIGKAP SIGKILL SIGKILLTHR SIGLOST SIGLWP  \
 424   SIGMIGRATE SIGMSG SIGPHONE SIGPIPE SIGPOLL SIGPRE SIGPROF SIGPWR      \
 425   SIGQUIT SIGRETRACT SIGSAK SIGSEGV SIGSOUND SIGSTKFLT SIGSTOP SIGSYS   \
 426   SIGTERM SIGTHAW SIGTRAP SIGTSTP SIGTTIN SIGTTOU SIGURG SIGUSR1        \
 427   SIGUSR2 SIGVIRT SIGVTALRM SIGWAITING SIGWINCH SIGWIND SIGWINDOW       \
 428   SIGXCPU SIGXFSZ
 429 _sig_syms_re = $(subst $(_sp),|,$(strip $(_sig_names) $(_sig_types_and_consts)))
 430
 431 # Prohibit the inclusion of signal.h without an actual use.
 432 sc_prohibit_signal_without_use:
 433         @h='<signal.h>'                                                 \
 434         re='\<($(_sig_function_re)) *\(|\<($(_sig_syms_re))\>'          \
 435           $(_header_without_use)
 436
 437 sc_obsolete_symbols:
 438         @re='\<(HAVE''_FCNTL_H|O''_NDELAY)\>'                           \
 439         msg='do not use HAVE''_FCNTL_H or O'_NDELAY                     \
 440           $(_prohibit_regexp)
 441
 442 # FIXME: warn about definitions of EXIT_FAILURE, EXIT_SUCCESS, STREQ
 443
 444 # Each nonempty ChangeLog line must start with a year number, or a TAB.
 445 sc_changelog:
 446         @if $(VC_LIST_EXCEPT) | grep -l '^ChangeLog$$' >/dev/null; then \
 447           grep -n '^[^12        ]'                                      \
 448             $$($(VC_LIST_EXCEPT) | grep '^ChangeLog$$') &&              \
 449           { echo '$(ME): found unexpected prefix in a ChangeLog' 1>&2;  \
 450             exit 1; } || :;                                             \
 451         fi
 452
 453 # Ensure that each .c file containing a "main" function also
 454 # calls set_program_name.
 455 sc_program_name:
 456         @if $(VC_LIST_EXCEPT) | grep -l '\.c$$' > /dev/null; then       \
 457           files=$$(grep -l '^main *(' $$($(VC_LIST_EXCEPT) | grep '\.c$$')); \
 458           grep -LE 'set_program_name *\(m?argv\[0\]\);' $$files         \
 459               | grep . &&                                               \
 460           { echo '$(ME): the above files do not call set_program_name'  \
 461                 1>&2; exit 1; } || :;                                   \
 462         else :;                                                         \
 463         fi
 464
 465 # Require that the final line of each test-lib.sh-using test be this one:
 466 # Exit $fail
 467 # Note: this test requires GNU grep's --label= option.
 468 Exit_witness_file ?= tests/test-lib.sh
 469 Exit_base := $(notdir $(Exit_witness_file))
 470 sc_require_test_exit_idiom:
 471         @if test -f $(srcdir)/$(Exit_witness_file); then                \
 472           die=0;                                                        \
 473           for i in $$(grep -l -F 'srcdir/$(Exit_base)'                  \
 474                 $$($(VC_LIST) tests)); do                               \
 475             tail -n1 $$i | grep '^Exit .' > /dev/null                   \
 476               && : || { die=1; echo $$i; }                              \
 477           done;                                                         \
 478           test $$die = 1 &&                                             \
 479             { echo 1>&2 '$(ME): the final line in each of the above is not:'; \
 480               echo 1>&2 'Exit something';                               \
 481               exit 1; } || :;                                           \
 482         fi
 483
 484 sc_the_the:
 485         @re='\<the ''the\>'                                             \
 486         ignore_case=1 msg='found use of "the ''the";'                   \
 487           $(_prohibit_regexp)
 488
 489 sc_trailing_blank:
 490         @re='[   ]$$'                                                   \
 491         msg='found trailing blank(s)'                                   \
 492           $(_prohibit_regexp)
 493
 494 # Match lines like the following, but where there is only one space
 495 # between the options and the description:
 496 #   -D, --all-repeated[=delimit-method]  print all duplicate lines\n
 497 longopt_re = --[a-z][0-9A-Za-z-]*(\[?=[0-9A-Za-z-]*\]?)?
 498 sc_two_space_separator_in_usage:
 499         @grep -nE '^   *(-[A-Za-z],)? $(longopt_re) [^ ].*\\$$'         \
 500             $$($(VC_LIST_EXCEPT)) &&                                    \
 501           { echo "$(ME): help2man requires at least two spaces between"; \
 502             echo "$(ME): an option and its description";                \
 503                 1>&2; exit 1; } || :
 504
 505 # Look for diagnostics that aren't marked for translation.
 506 # This won't find any for which error's format string is on a separate line.
 507 sc_unmarked_diagnostics:
 508         @grep -nE                                                       \
 509             '\<error \([^"]*"[^"]*[a-z]{3}' $$($(VC_LIST_EXCEPT))       \
 510           | grep -v '_''(' &&                                           \
 511           { echo '$(ME): found unmarked diagnostic(s)' 1>&2;            \
 512             exit 1; } || :
 513
 514 # Avoid useless parentheses like those in this example:
 515 # #if defined (SYMBOL) || defined (SYM2)
 516 sc_useless_cpp_parens:
 517         @grep -n '^# *if .*defined *(' $$($(VC_LIST_EXCEPT)) &&         \
 518           { echo '$(ME): found useless parentheses in cpp directive'    \
 519                 1>&2; exit 1; } || :
 520
 521 # Require the latest GPL.
 522 sc_GPL_version:
 523         @re='either ''version [^3]' msg='GPL vN, N!=3'                  \
 524           $(_prohibit_regexp)
 525
 526 # Require the latest GFDL.  Two regexp, since some .texi files end up
 527 # line wrapping between 'Free Documentation License,' and 'Version'.
 528 _GFDL_regexp = (Free ''Documentation.*Version 1\.[^3]|Version 1\.[^3] or any)
 529 sc_GFDL_version:
 530         @re='$(_GFDL_regexp)' msg='GFDL vN, N!=3'                       \
 531           $(_prohibit_regexp)
 532
 533 cvs_keywords = \
 534   Author|Date|Header|Id|Name|Locker|Log|RCSfile|Revision|Source|State
 535
 536 sc_prohibit_cvs_keyword:
 537         @re='\$$($(cvs_keywords))\$$'                                   \
 538             msg='do not use CVS keyword expansion'                      \
 539           $(_prohibit_regexp)
 540
 541 # Make sure we don't use st_blocks.  Use ST_NBLOCKS instead.
 542 # This is a bit of a kludge, since it prevents use of the string
 543 # even in comments, but for now it does the job with no false positives.
 544 sc_prohibit_stat_st_blocks:
 545         @re='[.>]st_blocks' msg='do not use st_blocks; use ST_NBLOCKS'  \
 546           $(_prohibit_regexp)
 547
 548 # Make sure we don't define any S_IS* macros in src/*.c files.
 549 # They're already defined via gnulib's sys/stat.h replacement.
 550 sc_prohibit_S_IS_definition:
 551         @re='^ *# *define  *S_IS'                                       \
 552         msg='do not define S_IS* macros; include <sys/stat.h>'          \
 553           $(_prohibit_regexp)
 554
 555 # Each program that uses proper_name_utf8 must link with one of the
 556 # ICONV libraries.  Otherwise, some ICONV library must appear in LDADD.
 557 # The perl -0777 invocation below extracts the possibly-multi-line
 558 # definition of LDADD from the appropriate Makefile.am and exits 0
 559 # when it contains "ICONV".
 560 sc_proper_name_utf8_requires_ICONV:
 561         @progs=$$(grep -l 'proper_name_utf8 ''("' $$($(VC_LIST_EXCEPT)));\
 562         if test "x$$progs" != x; then                                   \
 563           fail=0;                                                       \
 564           for p in $$progs; do                                          \
 565             dir=$$(dirname "$$p");                                      \
 566             perl -0777                                                  \
 567               -ne 'exit !(/^LDADD =(.+?[^\\]\n)/ms && $$1 =~ /ICONV/)'  \
 568               $$dir/Makefile.am && continue;                            \
 569             base=$$(basename "$$p" .c);                                 \
 570             grep "$${base}_LDADD.*ICONV)" $$dir/Makefile.am > /dev/null \
 571               || { fail=1; echo 1>&2 "$(ME): $$p uses proper_name_utf8"; }; \
 572           done;                                                         \
 573           test $$fail = 1 &&                                            \
 574             { echo 1>&2 '$(ME): the above do not link with any ICONV library'; \
 575               exit 1; } || :;                                           \
 576         fi
 577
 578 # Warn about "c0nst struct Foo const foo[]",
 579 # but not about "char const *const foo" or "#define const const".
 580 sc_redundant_const:
 581         @re='\bconst\b[[:space:][:alnum:]]{2,}\bconst\b'                \
 582         msg='redundant "const" in declarations'                         \
 583           $(_prohibit_regexp)
 584
 585 sc_const_long_option:
 586         @grep '^ *static.*struct option ' $$($(VC_LIST_EXCEPT))         \
 587           | grep -Ev 'const struct option|struct option const' && {     \
 588               echo 1>&2 '$(ME): add "const" to the above declarations'; \
 589               exit 1; } || :
 590
 591 NEWS_hash =                                                             \
 592   $$(sed -n '/^\*.* $(PREV_VERSION_REGEXP) ([0-9-]*)/,$$p'              \
 593        $(srcdir)/NEWS                                                   \
 594      | perl -0777 -pe                                                   \
 595         's/^Copyright.+?Free\sSoftware\sFoundation,\sInc\.\n//ms'       \
 596      | md5sum -                                                         \
 597      | sed 's/ .*//')
 598
 599 # Ensure that we don't accidentally insert an entry into an old NEWS block.
 600 sc_immutable_NEWS:
 601         @if test -f $(srcdir)/NEWS; then                                \
 602           test "$(NEWS_hash)" = '$(old_NEWS_hash)' && : ||              \
 603             { echo '$(ME): you have modified old NEWS' 1>&2; exit 1; }; \
 604         fi
 605
 606 # Update the hash stored above.  Do this after each release and
 607 # for any corrections to old entries.
 608 update-NEWS-hash: NEWS
 609         perl -pi -e 's/^(old_NEWS_hash[ \t]+:?=[ \t]+).*/$${1}'"$(NEWS_hash)/" \
 610           $(srcdir)/cfg.mk
 611
 612 # Ensure that we use only the standard $(VAR) notation,
 613 # not @...@ in Makefile.am, now that we can rely on automake
 614 # to emit a definition for each substituted variable.
 615 # We use perl rather than "grep -nE ..." to exempt a single
 616 # use of an @...@-delimited variable name in src/Makefile.am.
 617 # Allow the package to add exceptions via a hook in cfg.mk;
 618 # for example, @PRAGMA_SYSTEM_HEADER@ can be permitted by
 619 # setting this to ' && !/PRAGMA_SYSTEM_HEADER/'.
 620 _makefile_at_at_check_exceptions ?=
 621 sc_makefile_at_at_check:
 622         @perl -ne '/\@[A-Z_0-9]+\@/'$(_makefile_at_at_check_exceptions) \
 623           -e 'and (print "$$ARGV:$$.: $$_"), $$m=1; END {exit !$$m}'    \
 624             $$($(VC_LIST_EXCEPT) | grep -E '(^|/)Makefile\.am$$')       \
 625           && { echo '$(ME): use $$(...), not @...@' 1>&2; exit 1; } || :
 626
 627 news-check: NEWS
 628         if head $(srcdir)/NEWS | grep -E $(news-check-regexp)           \
 629             >/dev/null; then                                            \
 630           :;                                                            \
 631         else                                                            \
 632           echo 'NEWS: $$(news-check-regexp) failed to match' 1>&2;      \
 633           exit 1;                                                       \
 634         fi
 635
 636 sc_makefile_TAB_only_indentation:
 637         @grep -nE '^    [ ]{8}'                                         \
 638             $$($(VC_LIST_EXCEPT) | grep -E 'akefile|\.mk$$')            \
 639           && { echo '$(ME): found TAB-8-space indentation' 1>&2;        \
 640                exit 1; } || :
 641
 642 sc_m4_quote_check:
 643         @grep -nE '(AC_DEFINE(_UNQUOTED)?|AC_DEFUN)\([^[]'              \
 644             $$($(VC_LIST_EXCEPT) | grep -E '(^configure\.ac|\.m4)$$')   \
 645           && { echo '$(ME): quote the first arg to AC_DEF*' 1>&2;       \
 646                exit 1; } || :
 647
 648 fix_po_file_diag = \
 649 'you have changed the set of files with translatable diagnostics;\n\
 650 apply the above patch\n'
 651
 652 # Verify that all source files using _() are listed in po/POTFILES.in.
 653 po_file = po/POTFILES.in
 654 sc_po_check:
 655         @if test -f $(po_file); then                                    \
 656           grep -E -v '^(#|$$)' $(po_file)                               \
 657             | grep -v '^src/false\.c$$' | sort > $@-1;                  \
 658           files=;                                                       \
 659           for file in $$($(VC_LIST_EXCEPT)) lib/*.[ch]; do              \
 660             test -r $$file || continue;                                 \
 661             case $$file in                                              \
 662               *.m4|*.mk) continue ;;                                    \
 663               *.?|*.??) ;;                                              \
 664               *) continue;;                                             \
 665             esac;                                                       \
 666             case $$file in                                              \
 667             *.[ch])                                                     \
 668               base=`expr " $$file" : ' \(.*\)\..'`;                     \
 669               { test -f $$base.l || test -f $$base.y; } && continue;;   \
 670             esac;                                                       \
 671             files="$$files $$file";                                     \
 672           done;                                                         \
 673           grep -E -l '\b(N?_|gettext *)\([^)"]*("|$$)' $$files          \
 674             | sort -u > $@-2;                                           \
 675           diff -u -L $(po_file) -L $(po_file) $@-1 $@-2                 \
 676             || { printf '$(ME): '$(fix_po_file_diag) 1>&2; exit 1; };   \
 677           rm -f $@-1 $@-2;                                              \
 678         fi
 679
 680 # Sometimes it is useful to change the PATH environment variable
 681 # in Makefiles.  When doing so, it's better not to use the Unix-centric
 682 # path separator of `:', but rather the automake-provided `$(PATH_SEPARATOR)'.
 683 msg = '$(ME): Do not use `:'\'' above; use $$(PATH_SEPARATOR) instead'
 684 sc_makefile_path_separator_check:
 685         @grep -nE 'PATH[=].*:'                                          \
 686             $$($(VC_LIST_EXCEPT) | grep -E 'akefile|\.mk$$')            \
 687           && { echo $(msg) 1>&2; exit 1; } || :
 688
 689 # Check that `make alpha' will not fail at the end of the process.
 690 writable-files:
 691         if test -d $(release_archive_dir); then :; else                 \
 692           for file in $(distdir).tar.gz                                 \
 693                       $(release_archive_dir)/$(distdir).tar.gz; do      \
 694             test -e $$file || continue;                                 \
 695             test -w $$file                                              \
 696               || { echo ERROR: $$file is not writable; fail=1; };       \
 697           done;                                                         \
 698           test "$$fail" && exit 1 || : ;                                \
 699         fi
 700
 701 v_etc_file = lib/version-etc.c
 702 sample-test = tests/sample-test
 703 texi = doc/$(PACKAGE).texi
 704 # Make sure that the copyright date in $(v_etc_file) is up to date.
 705 # Do the same for the $(sample-test) and the main doc/.texi file.
 706 sc_copyright_check:
 707         @if test -f $(v_etc_file); then                                 \
 708           grep 'enum { COPYRIGHT_YEAR = '$$(date +%Y)' };' $(v_etc_file) \
 709             >/dev/null                                                  \
 710           || { echo 'out of date copyright in $(v_etc_file); update it' 1>&2; \
 711                exit 1; };                                               \
 712         fi
 713         @if test -f $(sample-test); then                                \
 714           grep '# Copyright (C) '$$(date +%Y)' Free' $(sample-test)     \
 715             >/dev/null                                                  \
 716           || { echo 'out of date copyright in $(sample-test); update it' 1>&2; \
 717                exit 1; };                                               \
 718         fi
 719         @if test -f $(texi); then                                       \
 720           grep 'Copyright @copyright{} .*'$$(date +%Y)' Free' $(texi)   \
 721             >/dev/null                                                  \
 722           || { echo 'out of date copyright in $(texi); update it' 1>&2; \
 723                exit 1; };                                               \
 724         fi
 725
 726 # #if HAVE_... will evaluate to false for any non numeric string.
 727 # That would be flagged by using -Wundef, however gnulib currently
 728 # tests many undefined macros, and so we can't enable that option.
 729 # So at least preclude common boolean strings as macro values.
 730 sc_Wundef_boolean:
 731         @grep -Ei '^#define.*(yes|no|true|false)$$' '$(CONFIG_INCLUDE)' && \
 732           { echo 'Use 0 or 1 for macro values' 1>&2; exit 1; } || :
 733
 734 sc_vulnerable_makefile_CVE-2009-4029:
 735         @files=$$(find $(srcdir) -name Makefile.in);                    \
 736         if test -n "$$files"; then                                      \
 737           grep -E                                                       \
 738             'perm -777 -exec chmod a\+rwx|chmod 777 \$$\(distdir\)'     \
 739             $$files &&                                                  \
 740           { echo '$(ME): the above files are vulnerable; beware of'     \
 741             'running "make dist*" rules, and upgrade to fixed automake' \
 742             'see http://bugzilla.redhat.com/542609 for details'         \
 743                 1>&2; exit 1; } || :;                                   \
 744         else :;                                                         \
 745         fi
 746
 747 vc-diff-check:
 748         (unset CDPATH; cd $(srcdir) && $(VC) diff) > vc-diffs || :
 749         if test -s vc-diffs; then                               \
 750           cat vc-diffs;                                         \
 751           echo "Some files are locally modified:" 1>&2;         \
 752           exit 1;                                               \
 753         else                                                    \
 754           rm vc-diffs;                                          \
 755         fi
 756
 757 rel-files = $(DIST_ARCHIVES)
 758
 759 gnulib_dir ?= $(srcdir)/gnulib
 760 gnulib-version = $$(cd $(gnulib_dir) && git describe)
 761 bootstrap-tools ?= autoconf,automake,gnulib
 762
 763 # If it's not already specified, derive the GPG key ID from
 764 # the signed tag we've just applied to mark this release.
 765 gpg_key_ID ?= \
 766   $$(git cat-file tag v$(VERSION) > .ann-sig \
 767      && gpgv .ann-sig - < /dev/null 2>&1 \
 768           | sed -n '/.*key ID \([0-9A-F]*\)/s//\1/p'; rm -f .ann-sig)
 769
 770 announcement: NEWS ChangeLog $(rel-files)
 771         @$(build_aux)/announce-gen                                      \
 772             --release-type=$(RELEASE_TYPE)                              \
 773             --package=$(PACKAGE)                                        \
 774             --prev=$(PREV_VERSION)                                      \
 775             --curr=$(VERSION)                                           \
 776             --gpg-key-id=$(gpg_key_ID)                                  \
 777             --news=$(srcdir)/NEWS                                       \
 778             --bootstrap-tools=$(bootstrap-tools)                        \
 779             --gnulib-version=$(gnulib-version)                          \
 780             --no-print-checksums                                        \
 781             $(addprefix --url-dir=, $(url_dir_list))
 782
 783 ## ---------------- ##
 784 ## Updating files.  ##
 785 ## ---------------- ##
 786
 787 ftp-gnu = ftp://ftp.gnu.org/gnu
 788 www-gnu = http://www.gnu.org
 789
 790 emit_upload_commands:
 791         @echo =====================================
 792         @echo =====================================
 793         @echo "$(build_aux)/gnupload $(GNUPLOADFLAGS) \\"
 794         @echo "    --to $(gnu_rel_host):$(PACKAGE) \\"
 795         @echo "  $(rel-files)"
 796         @echo '# send the ~/announce-$(my_distdir) e-mail'
 797         @echo =====================================
 798         @echo =====================================
 799
 800 noteworthy = * Noteworthy changes in release ?.? (????-??-??) [?]
 801 define emit-commit-log
 802   printf '%s\n' 'post-release administrivia' '' \
 803     '* NEWS: Add header line for next release.' \
 804     '* .prev-version: Record previous version.' \
 805     '* cfg.mk (old_NEWS_hash): Auto-update.'
 806 endef
 807
 808 .PHONY: no-submodule-changes
 809 no-submodule-changes:
 810         if test -d $(srcdir)/.git; then                                 \
 811           diff=$$(cd $(srcdir) && git submodule -q foreach              \
 812                   git diff-index --name-only HEAD)                      \
 813             || exit 1;                                                  \
 814           case $$diff in '') ;;                                         \
 815             *) echo '$(ME): submodule files are locally modified:';     \
 816                 echo "$$diff"; exit 1;; esac;                           \
 817         else                                                            \
 818           : ;                                                           \
 819         fi
 820
 821 .PHONY: alpha beta stable
 822 ALL_RECURSIVE_TARGETS += alpha beta stable
 823 alpha beta stable: $(local-check) writable-files no-submodule-changes
 824         test $@ = stable                                                \
 825           && { echo $(VERSION) | grep -E '^[0-9]+(\.[0-9]+)+$$'         \
 826                || { echo "invalid version string: $(VERSION)" 1>&2; exit 1;};}\
 827           || :
 828         $(MAKE) vc-diff-check
 829         $(MAKE) news-check
 830         $(MAKE) distcheck
 831         $(MAKE) dist XZ_OPT=-9ev
 832         $(MAKE) $(release-prep-hook) RELEASE_TYPE=$@
 833         $(MAKE) -s emit_upload_commands RELEASE_TYPE=$@
 834
 835 # Override this in cfg.mk if you follow different procedures.
 836 release-prep-hook ?= release-prep
 837
 838 .PHONY: release-prep
 839 release-prep:
 840         case $$RELEASE_TYPE in alpha|beta|stable) ;; \
 841           *) echo "invalid RELEASE_TYPE: $$RELEASE_TYPE" 1>&2; exit 1;; esac
 842         $(MAKE) -s announcement > ~/announce-$(my_distdir)
 843         if test -d $(release_archive_dir); then                 \
 844           ln $(rel-files) $(release_archive_dir);               \
 845           chmod a-w $(rel-files);                               \
 846         fi
 847         echo $(VERSION) > $(prev_version_file)
 848         $(MAKE) update-NEWS-hash
 849         perl -pi -e '$$. == 3 and print "$(noteworthy)\n\n\n"' NEWS
 850         $(emit-commit-log) > .ci-msg
 851         $(VC) commit -F .ci-msg -a
 852         rm .ci-msg
 853
 854 .PHONY: web-manual
 855 web-manual:
 856         @test -z "$(manual_title)" \
 857           && { echo define manual_title in cfg.mk 1>&2; exit 1; } || :
 858         @cd '$(srcdir)/doc'; \
 859           $(SHELL) ../build-aux/gendocs.sh -o '$(abs_builddir)/doc/manual' \
 860              --email $(PACKAGE_BUGREPORT) $(PACKAGE) \
 861             "$(PACKAGE_NAME) - $(manual_title)"
 862         @echo " *** Upload the doc/manual directory to web-cvs."
 863
 864 # Code Coverage
 865
 866 init-coverage:
 867         $(MAKE) $(AM_MAKEFLAGS) clean
 868         lcov --directory . --zerocounters
 869
 870 COVERAGE_CCOPTS ?= "-g --coverage"
 871 COVERAGE_OUT ?= doc/coverage
 872
 873 build-coverage:
 874         $(MAKE) $(AM_MAKEFLAGS) CFLAGS=$(COVERAGE_CCOPTS) CXXFLAGS=$(COVERAGE_CCOPTS)
 875         $(MAKE) $(AM_MAKEFLAGS) CFLAGS=$(COVERAGE_CCOPTS) CXXFLAGS=$(COVERAGE_CCOPTS) check
 876         mkdir -p $(COVERAGE_OUT)
 877         lcov --directory . --output-file $(COVERAGE_OUT)/$(PACKAGE).info \
 878                 --capture
 879
 880 gen-coverage:
 881         genhtml --output-directory $(COVERAGE_OUT) \
 882                 $(COVERAGE_OUT)/$(PACKAGE).info \
 883                 --highlight --frames --legend \
 884                 --title "$(PACKAGE_NAME)"
 885
 886 coverage: init-coverage build-coverage gen-coverage
 887
 888 # Update gettext files.
 889 PACKAGE ?= $(shell basename $(PWD))
 890 PO_DOMAIN ?= $(PACKAGE)
 891 POURL = http://translationproject.org/latest/$(PO_DOMAIN)/
 892 PODIR ?= po
 893 refresh-po:
 894         rm -f $(PODIR)/*.po && \
 895         echo "$(ME): getting translations into po (please ignore the robots.txt ERROR 404)..." && \
 896         wget --no-verbose --directory-prefix $(PODIR) --no-directories --recursive --level 1 --accept .po --accept .po.1 $(POURL) && \
 897         echo 'en@boldquot' > $(PODIR)/LINGUAS && \
 898         echo 'en@quot' >> $(PODIR)/LINGUAS && \
 899         ls $(PODIR)/*.po | sed 's/\.po//' | sed 's,$(PODIR)/,,' | sort >> $(PODIR)/LINGUAS
 900
 901 INDENT_SOURCES ?= $(C_SOURCES)
 902 .PHONY: indent
 903 indent:
 904         indent $(INDENT_SOURCES)
 905
 906 # If you want to set UPDATE_COPYRIGHT_* environment variables,
 907 # put the assignments in this variable.
 908 update-copyright-env ?=
 909
 910 # Run this rule once per year (usually early in January)
 911 # to update all FSF copyright year lists in your project.
 912 # If you have an additional project-specific rule,
 913 # add it in cfg.mk along with a line 'update-copyright: prereq'.
 914 # By default, exclude all variants of COPYING; you can also
 915 # add exemptions (such as ChangeLog..* for rotated change logs)
 916 # in the file .x-update-copyright.
 917 .PHONY: update-copyright
 918 update-copyright:
 919         grep -l -w Copyright                                             \
 920           $$(export VC_LIST_EXCEPT_DEFAULT=COPYING && $(VC_LIST_EXCEPT)) \
 921           | $(update-copyright-env) xargs $(build_aux)/$@