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) 2001-2022 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 <https://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 # These variables ought to be defined through the configure.ac section
  25 # of the module description. But some packages import this file directly,
  26 # ignoring the module description.
  27 AWK ?= awk
  28 GREP ?= grep
  29 SED ?= sed
  30
  31 # Helper variables.
  32 _empty =
  33 _sp = $(_empty) $(_empty)
  34
  35 # _equal,S1,S2
  36 # ------------
  37 # If S1 == S2, return S1, otherwise the empty string.
  38 _equal = $(and $(findstring $(1),$(2)),$(findstring $(2),$(1)))
  39
  40 # member-check,VARIABLE,VALID-VALUES
  41 # ----------------------------------
  42 # Check that $(VARIABLE) is in the space-separated list of VALID-VALUES, and
  43 # return it.  Die otherwise.
  44 member-check =                                                          \
  45   $(strip                                                               \
  46     $(if $($(1)),                                                       \
  47       $(if $(findstring $(_sp),$($(1))),                                \
  48           $(error invalid $(1): '$($(1))', expected $(2)),              \
  49           $(or $(findstring $(_sp)$($(1))$(_sp),$(_sp)$(2)$(_sp)),      \
  50             $(error invalid $(1): '$($(1))', expected $(2)))),          \
  51       $(error $(1) undefined)))
  52
  53 # Do not save the original name or timestamp in the .tar.gz file.
  54 # Use --rsyncable if available.
  55 gzip_rsyncable := \
  56   $(shell gzip --help 2>/dev/null|$(GREP) rsyncable >/dev/null \
  57     && printf %s --rsyncable)
  58 GZIP_ENV = '--no-name --best $(gzip_rsyncable)'
  59
  60 GIT = git
  61 VC = $(GIT)
  62
  63 VC_LIST = $(srcdir)/$(_build-aux)/vc-list-files -C $(srcdir)
  64
  65 # You can override this variable in cfg.mk if your gnulib submodule lives
  66 # in a different location.
  67 gnulib_dir ?= $(shell if test -f $(srcdir)/gnulib/gnulib-tool; then \
  68                         echo $(srcdir)/gnulib; \
  69                 else \
  70                         echo ${GNULIB_SRCDIR}; \
  71                 fi)
  72
  73 # You can override this variable in cfg.mk to set your own regexp
  74 # matching files to ignore.
  75 VC_LIST_ALWAYS_EXCLUDE_REGEX ?= ^$$
  76
  77 # This is to preprocess robustly the output of $(VC_LIST), so that even
  78 # when $(srcdir) is a pathological name like "....", the leading sed command
  79 # removes only the intended prefix.
  80 _dot_escaped_srcdir = $(subst .,\.,$(srcdir))
  81
  82 # Post-process $(VC_LIST) output, prepending $(srcdir)/, but only
  83 # when $(srcdir) is not ".".
  84 ifeq ($(srcdir),.)
  85   _prepend_srcdir_prefix =
  86 else
  87   _prepend_srcdir_prefix = | $(SED) 's|^|$(srcdir)/|'
  88 endif
  89
  90 # In order to be able to consistently filter "."-relative names,
  91 # (i.e., with no $(srcdir) prefix), this definition is careful to
  92 # remove any $(srcdir) prefix, and to restore what it removes.
  93 _sc_excl = \
  94   $(or $(exclude_file_name_regexp--$@),^$$)
  95 VC_LIST_EXCEPT = \
  96   $(VC_LIST) | $(SED) 's|^$(_dot_escaped_srcdir)/||' \
  97         | if test -f $(srcdir)/.x-$@; then $(GREP) -vEf $(srcdir)/.x-$@; \
  98           else $(GREP) -Ev -e "$${VC_LIST_EXCEPT_DEFAULT-ChangeLog}"; fi \
  99         | $(GREP) -Ev -e '($(VC_LIST_ALWAYS_EXCLUDE_REGEX)|$(_sc_excl))' \
 100         $(_prepend_srcdir_prefix)
 101
 102 ifeq ($(origin prev_version_file), undefined)
 103   prev_version_file = $(srcdir)/.prev-version
 104 endif
 105
 106 PREV_VERSION := $(shell cat $(prev_version_file) 2>/dev/null)
 107 VERSION_REGEXP = $(subst .,\.,$(VERSION))
 108 PREV_VERSION_REGEXP = $(subst .,\.,$(PREV_VERSION))
 109
 110 ifeq ($(VC),$(GIT))
 111   this-vc-tag = v$(VERSION)
 112   this-vc-tag-regexp = v$(VERSION_REGEXP)
 113 else
 114   tag-package = $(shell echo "$(PACKAGE)" | tr '[:lower:]' '[:upper:]')
 115   tag-this-version = $(subst .,_,$(VERSION))
 116   this-vc-tag = $(tag-package)-$(tag-this-version)
 117   this-vc-tag-regexp = $(this-vc-tag)
 118 endif
 119 my_distdir = $(PACKAGE)-$(VERSION)
 120
 121 # Old releases are stored here.
 122 release_archive_dir ?= ../release
 123
 124 # If RELEASE_TYPE is undefined, but RELEASE is, use its second word.
 125 # But overwrite VERSION.
 126 ifdef RELEASE
 127   VERSION := $(word 1, $(RELEASE))
 128   RELEASE_TYPE ?= $(word 2, $(RELEASE))
 129 endif
 130
 131 # Validate and return $(RELEASE_TYPE), or die.
 132 RELEASE_TYPES = alpha beta stable
 133 release-type = $(call member-check,RELEASE_TYPE,$(RELEASE_TYPES))
 134
 135 # Override gnu_rel_host and url_dir_list in cfg.mk if these are not right.
 136 # Use alpha.gnu.org for alpha and beta releases.
 137 # Use ftp.gnu.org for stable releases.
 138 gnu_ftp_host-alpha = alpha.gnu.org
 139 gnu_ftp_host-beta = alpha.gnu.org
 140 gnu_ftp_host-stable = ftp.gnu.org
 141 gnu_rel_host ?= $(gnu_ftp_host-$(release-type))
 142
 143 url_dir_list ?= $(if $(call _equal,$(gnu_rel_host),ftp.gnu.org),        \
 144                      https://ftpmirror.gnu.org/$(PACKAGE),              \
 145                      https://$(gnu_rel_host)/gnu/$(PACKAGE))
 146
 147 # Override this in cfg.mk if you are using a different format in your
 148 # NEWS file.
 149 today = $(shell date +%Y-%m-%d)
 150
 151 # Select which lines of NEWS are searched for $(news-check-regexp).
 152 # This is a sed line number spec.  The default says that we search
 153 # lines 1..10 of NEWS for $(news-check-regexp).
 154 # If you want to search only line 3 or only lines 20-22, use "3" or "20,22".
 155 news-check-lines-spec ?= 1,10
 156 news-check-regexp ?= '^\*.* $(VERSION_REGEXP) \($(today)\)'
 157
 158 # Prevent programs like 'sort' from considering distinct strings to be equal.
 159 # Doing it here saves us from having to set LC_ALL elsewhere in this file.
 160 export LC_ALL = C
 161
 162 ## --------------- ##
 163 ## Sanity checks.  ##
 164 ## --------------- ##
 165
 166 ifneq ($(_gl-Makefile),)
 167 _cfg_mk := $(wildcard $(srcdir)/cfg.mk)
 168
 169 # Collect the names of rules starting with 'sc_'.
 170 syntax-check-rules := $(sort $(shell env LC_ALL=C $(SED) -n \
 171    's/^\(sc_[a-zA-Z0-9_-]*\):.*/\1/p' $(srcdir)/$(ME) $(_cfg_mk)))
 172 .PHONY: $(syntax-check-rules)
 173
 174 ifeq ($(shell $(VC_LIST) >/dev/null 2>&1; echo $$?),0)
 175   local-checks-available += $(syntax-check-rules)
 176 else
 177   local-checks-available += no-vc-detected
 178 no-vc-detected:
 179         @echo "No version control files detected; skipping syntax check"
 180 endif
 181 .PHONY: $(local-checks-available)
 182
 183 # Arrange to print the name of each syntax-checking rule just before running it.
 184 $(syntax-check-rules): %: %.m
 185 sc_m_rules_ = $(patsubst %, %.m, $(syntax-check-rules))
 186 .PHONY: $(sc_m_rules_)
 187 $(sc_m_rules_):
 188         @echo $(patsubst sc_%.m, %, $@)
 189         @date +%s.%N > .sc-start-$(basename $@)
 190
 191 # Compute and print the elapsed time for each syntax-check rule.
 192 sc_z_rules_ = $(patsubst %, %.z, $(syntax-check-rules))
 193 .PHONY: $(sc_z_rules_)
 194 $(sc_z_rules_): %.z: %
 195         @end=$$(date +%s.%N);                                           \
 196         start=$$(cat .sc-start-$*);                                     \
 197         rm -f .sc-start-$*;                                             \
 198         $(AWK) -v s=$$start -v e=$$end                                  \
 199           'END {printf "%.2f $(patsubst sc_%,%,$*)\n", e - s}' < /dev/null
 200
 201 # The patsubst here is to replace each sc_% rule with its sc_%.z wrapper
 202 # that computes and prints elapsed time.
 203 local-check :=                                                          \
 204   $(patsubst sc_%, sc_%.z,                                              \
 205     $(filter-out $(local-checks-to-skip), $(local-checks-available)))
 206
 207 syntax-check: $(local-check)
 208 endif
 209
 210 # _sc_search_regexp
 211 #
 212 # This macro searches for a given construct in the selected files and
 213 # then takes some action.
 214 #
 215 # Parameters (shell variables):
 216 #
 217 #  prohibit | require
 218 #
 219 #     Regular expression (ERE) denoting either a forbidden construct
 220 #     or a required construct.  Those arguments are exclusive.
 221 #
 222 #  exclude
 223 #
 224 #     Regular expression (ERE) denoting lines to ignore that matched
 225 #     a prohibit construct.  For example, this can be used to exclude
 226 #     comments that mention why the nearby code uses an alternative
 227 #     construct instead of the simpler prohibited construct.
 228 #
 229 #  in_vc_files | in_files
 230 #
 231 #     grep-E-style regexp selecting the files to check.  For in_vc_files,
 232 #     the regexp is used to select matching files from the list of all
 233 #     version-controlled files; for in_files, it's from the names printed
 234 #     by "find $(srcdir)".  When neither is specified, use all files that
 235 #     are under version control.
 236 #
 237 #  containing | non_containing
 238 #
 239 #     Select the files (non) containing strings matching this regexp.
 240 #     If both arguments are specified then CONTAINING takes
 241 #     precedence.
 242 #
 243 #  with_grep_options
 244 #
 245 #     Extra options for grep.
 246 #
 247 #  ignore_case
 248 #
 249 #     Ignore case.
 250 #
 251 #  halt
 252 #
 253 #     Message to display before to halting execution.
 254 #
 255 # Finally, you may exempt files based on an ERE matching file names.
 256 # For example, to exempt from the sc_space_tab check all files with the
 257 # .diff suffix, set this Make variable:
 258 #
 259 # exclude_file_name_regexp--sc_space_tab = \.diff$
 260 #
 261 # Note that while this functionality is mostly inherited via VC_LIST_EXCEPT,
 262 # when filtering by name via in_files, we explicitly filter out matching
 263 # names here as well.
 264
 265 # Initialize each, so that envvar settings cannot interfere.
 266 export require =
 267 export prohibit =
 268 export exclude =
 269 export in_vc_files =
 270 export in_files =
 271 export containing =
 272 export non_containing =
 273 export halt =
 274 export with_grep_options =
 275
 276 # By default, _sc_search_regexp does not ignore case.
 277 export ignore_case =
 278 _ignore_case = $$(test -n "$$ignore_case" && printf %s -i || :)
 279
 280 define _sc_say_and_exit
 281    dummy=; : so we do not need a semicolon before each use;             \
 282    { printf '%s\n' "$(ME): $$msg" 1>&2; exit 1; };
 283 endef
 284
 285 define _sc_search_regexp
 286    dummy=; : so we do not need a semicolon before each use;             \
 287                                                                         \
 288    : Check arguments;                                                   \
 289    test -n "$$prohibit" && test -n "$$require"                          \
 290      && { msg='Cannot specify both prohibit and require'                \
 291           $(_sc_say_and_exit) } || :;                                   \
 292    test -z "$$prohibit" && test -z "$$require"                          \
 293      && { msg='Should specify either prohibit or require'               \
 294           $(_sc_say_and_exit) } || :;                                   \
 295    test -z "$$prohibit" && test -n "$$exclude"                          \
 296      && { msg='Use of exclude requires a prohibit pattern'              \
 297           $(_sc_say_and_exit) } || :;                                   \
 298    test -n "$$in_vc_files" && test -n "$$in_files"                      \
 299      && { msg='Cannot specify both in_vc_files and in_files'            \
 300           $(_sc_say_and_exit) } || :;                                   \
 301    test "x$$halt" != x                                                  \
 302      || { msg='halt not defined' $(_sc_say_and_exit) };                 \
 303                                                                         \
 304    : Filter by file name;                                               \
 305    if test -n "$$in_files"; then                                        \
 306      files=$$(find $(srcdir) | $(GREP) -E "$$in_files"                  \
 307               | $(GREP) -Ev '$(_sc_excl)');                             \
 308    else                                                                 \
 309      files=$$($(VC_LIST_EXCEPT));                                       \
 310      if test -n "$$in_vc_files"; then                                   \
 311        files=$$(echo "$$files" | $(GREP) -E "$$in_vc_files");           \
 312      fi;                                                                \
 313    fi;                                                                  \
 314                                                                         \
 315    : Filter by content;                                                 \
 316    test -n "$$files"                                                    \
 317      && test -n "$$containing"                                          \
 318      && { files=$$(echo "$$files" | xargs $(GREP) -l "$$containing"); } \
 319      || :;                                                              \
 320    test -n "$$files"                                                    \
 321      && test -n "$$non_containing"                                      \
 322      && { files=$$(echo "$$files" | xargs $(GREP) -vl "$$non_containing"); } \
 323      || :;                                                              \
 324                                                                         \
 325    : Check for the construct;                                           \
 326    if test -n "$$files"; then                                           \
 327      if test -n "$$prohibit"; then                                      \
 328        echo "$$files"                                                   \
 329          | xargs $(GREP) $$with_grep_options $(_ignore_case) -nE        \
 330                 "$$prohibit" /dev/null                                  \
 331          | $(GREP) -vE "$${exclude:-^$$}"                               \
 332          && { msg="$$halt" $(_sc_say_and_exit) }                        \
 333          || :;                                                          \
 334      else                                                               \
 335        echo "$$files"                                                   \
 336          | xargs                                                        \
 337              $(GREP) $$with_grep_options $(_ignore_case) -LE "$$require" \
 338          | $(GREP) .                                                    \
 339          && { msg="$$halt" $(_sc_say_and_exit) }                        \
 340          || :;                                                          \
 341      fi                                                                 \
 342    else :;                                                              \
 343    fi || :;
 344 endef
 345
 346 sc_avoid_if_before_free:
 347         @$(VC_LIST_EXCEPT)                                              \
 348           | $(GREP) -v useless-if-before-free                           \
 349           | xargs                                                       \
 350               $(srcdir)/$(_build-aux)/useless-if-before-free            \
 351               $(useless_free_options)                                   \
 352           && { printf '$(ME): found useless "if"'                       \
 353                       ' before "free" above\n' 1>&2;                    \
 354                exit 1; }                                                \
 355           || :
 356
 357 sc_cast_of_argument_to_free:
 358         @prohibit='\<free *\( *\(' halt="don't cast free argument"      \
 359           $(_sc_search_regexp)
 360
 361 sc_cast_of_x_alloc_return_value:
 362         @prohibit='\*\) *x(m|c|re)alloc\>'                              \
 363         halt="don't cast x*alloc return value"                          \
 364           $(_sc_search_regexp)
 365
 366 sc_cast_of_alloca_return_value:
 367         @prohibit='\*\) *alloca\>'                                      \
 368         halt="don't cast alloca return value"                           \
 369           $(_sc_search_regexp)
 370
 371 sc_space_tab:
 372         @prohibit='[ ]  '                                               \
 373         halt='found SPACE-TAB sequence; remove the SPACE'               \
 374           $(_sc_search_regexp)
 375
 376 # Don't use *scanf or the old ato* functions in "real" code.
 377 # They provide no error checking mechanism.
 378 # Instead, use strto* functions.
 379 sc_prohibit_atoi_atof:
 380         @prohibit='\<([fs]?scanf|ato([filq]|ll)) *\('                           \
 381         halt='do not use *scan''f, ato''f, ato''i, ato''l, ato''ll or ato''q'   \
 382           $(_sc_search_regexp)
 383
 384 # Use STREQ rather than comparing strcmp == 0, or != 0.
 385 sp_ = strcmp *\(.+\)
 386 sc_prohibit_strcmp:
 387         @prohibit='! *strcmp *\(|\<$(sp_) *[!=]=|[!=]= *$(sp_)'         \
 388         exclude='# *define STRN?EQ\('                                   \
 389         halt='replace strcmp calls above with STREQ/STRNEQ'             \
 390           $(_sc_search_regexp)
 391
 392 # Really.  You don't want to use this function.
 393 # It may fail to NUL-terminate the destination,
 394 # and always NUL-pads out to the specified length.
 395 sc_prohibit_strncpy:
 396         @prohibit='\<strncpy *\('                                       \
 397         halt='do not use strncpy, period'                               \
 398           $(_sc_search_regexp)
 399
 400 # Pass EXIT_*, not number, to usage, exit, and error (when exiting)
 401 # Convert all uses automatically, via these two commands:
 402 # git grep -l '\<exit *(1)' \
 403 #  | grep -vEf .x-sc_prohibit_magic_number_exit \
 404 #  | xargs --no-run-if-empty \
 405 #      perl -pi -e 's/(^|[^.])\b(exit ?)\(1\)/$1$2(EXIT_FAILURE)/'
 406 # git grep -l '\<exit *(0)' \
 407 #  | grep -vEf .x-sc_prohibit_magic_number_exit \
 408 #  | xargs --no-run-if-empty \
 409 #      perl -pi -e 's/(^|[^.])\b(exit ?)\(0\)/$1$2(EXIT_SUCCESS)/'
 410 sc_prohibit_magic_number_exit:
 411         @prohibit='(^|[^.])\<(usage|exit|error) ?\(-?[0-9]+[,)]'        \
 412         exclude='exit \(77\)|error ?\(((0|77),|[^,]*)'                  \
 413         halt='use EXIT_* values rather than magic number'               \
 414           $(_sc_search_regexp)
 415
 416 # Check that we don't use $< in non-implicit Makefile rules.
 417 #
 418 # To find the Makefiles, trace AC_CONFIG_FILES.  Using VC_LIST would
 419 # miss the Makefiles that are not under VC control (e.g., symlinks
 420 # installed for gettext).  "Parsing" (recursive) uses of SUBDIRS seems
 421 # too delicate.
 422 #
 423 # Use GNU Make's --print-data-base to normalize the rules into some
 424 # easy to parse format: they are separated by two \n.  Look for the
 425 # "section" about non-pattern rules (marked with "# Files") inside
 426 # which there are still the POSIX Make like implicit rules (".c.o").
 427 sc_prohibit_gnu_make_extensions_awk_ =                                  \
 428   BEGIN {                                                               \
 429       RS = "\n\n";                                                      \
 430       in_rules = 0;                                                     \
 431   }                                                                     \
 432   /^\# Files/ {                                                         \
 433       in_rules = 1;                                                     \
 434   }                                                                     \
 435   /\$$</ && in_rules && $$0 !~ /^(.*\n)*\.\w+(\.\w+)?:/ {               \
 436       print "Error: " file ": $$< in a non implicit rule\n" $$0;        \
 437       status = 1;                                                       \
 438   }                                                                     \
 439   END {                                                                 \
 440      exit status;                                                       \
 441   }
 442 sc_prohibit_gnu_make_extensions:
 443         @if $(AWK) --version | grep GNU >/dev/null 2>&1; then           \
 444           (cd $(srcdir) && autoconf --trace AC_CONFIG_FILES:'$$1') |    \
 445             tr ' ' '\n' |                                               \
 446             $(SED) -ne '/Makefile/{s/\.in$$//;p;}' |                    \
 447             while read m; do                                            \
 448               $(MAKE) -qp -f $$m .DUMMY-TARGET 2>/dev/null |            \
 449                 $(AWK) -v file=$$m -e '$($@_awk_)' || exit 1;           \
 450             done;                                                       \
 451         fi
 452
 453 # Using EXIT_SUCCESS as the first argument to error is misleading,
 454 # since when that parameter is 0, error does not exit.  Use '0' instead.
 455 sc_error_exit_success:
 456         @prohibit='error *\(EXIT_SUCCESS,'                              \
 457         in_vc_files='\.[chly]$$'                                        \
 458         halt='found error (EXIT_SUCCESS'                                \
 459          $(_sc_search_regexp)
 460
 461 # "FATAL:" should be fully upper-cased in error messages
 462 # "WARNING:" should be fully upper-cased, or fully lower-cased
 463 sc_error_message_warn_fatal:
 464         @$(VC_LIST_EXCEPT)                                              \
 465           | xargs $(GREP) -nEA2 '[^rp]error *\(' /dev/null              \
 466           | $(GREP) -E '"Warning|"Fatal|"fatal'                         \
 467           && { echo '$(ME): use FATAL, WARNING or warning' 1>&2;        \
 468                exit 1; }                                                \
 469           || :
 470
 471 # Error messages should not start with a capital letter;
 472 # however, if they start with an entire fully uppercased word, that's
 473 # probably a proper noun and it should stay that way.  We also exempt
 474 # known instances of proper nouns that should stay mixed-case.
 475 sc_error_message_uppercase:
 476         @$(VC_LIST_EXCEPT)                                              \
 477           | xargs $(GREP) -nEA2 '[^rp]error *\(' /dev/null              \
 478           | $(GREP) -E '"[A-Z]'                                         \
 479           | $(GREP) -vE '"([A-Z0-9_]{2,}\>|Java|C#|(PRI|SCN)[dioux])'   \
 480           && { echo '$(ME): found capitalized error message' 1>&2;      \
 481                exit 1; }                                                \
 482           || :
 483
 484 # Error messages should not end with a period
 485 sc_error_message_period:
 486         @$(VC_LIST_EXCEPT)                                              \
 487           | xargs $(GREP) -nEA2 '[^rp]error *\(' /dev/null              \
 488           | $(GREP) -E '[^."]\."'                                       \
 489           && { echo '$(ME): found error message ending in period' 1>&2; \
 490                exit 1; }                                                \
 491           || :
 492
 493 sc_file_system:
 494         @prohibit=file''system                                          \
 495         exclude='/proc/filesystems'                                     \
 496         ignore_case=1                                                   \
 497         halt='found use of "file''system"; spell it "file system"'      \
 498           $(_sc_search_regexp)
 499
 500 # Don't use cpp tests of this symbol.  All code assumes config.h is included.
 501 sc_prohibit_have_config_h:
 502         @prohibit='^# *if.*HAVE''_CONFIG_H'                             \
 503         halt='found use of HAVE''_CONFIG_H; remove'                     \
 504           $(_sc_search_regexp)
 505
 506 # Nearly all .c files must include <config.h>.  However, we also permit this
 507 # via inclusion of a package-specific header, if cfg.mk specified one.
 508 # config_h_header must be suitable for grep -E.
 509 config_h_header ?= <config\.h>
 510 sc_require_config_h:
 511         @require='^# *include $(config_h_header)'                       \
 512         in_vc_files='\.c$$'                                             \
 513         halt='the above files do not include <config.h>'                \
 514           $(_sc_search_regexp)
 515
 516 # Print each file name for which the first #include does not match
 517 # $(config_h_header).  Like grep -m 1, this only looks at the first match.
 518 perl_config_h_first_ =                                                  \
 519   -e 'BEGIN {$$ret = 0}'                                                \
 520   -e 'if (/^\# *include\b/) {'                                          \
 521   -e '  if (not m{^\# *include $(config_h_header)}) {'                  \
 522   -e '    print "$$ARGV\n";'                                            \
 523   -e '    $$ret = 1;'                                                   \
 524   -e '  }'                                                              \
 525   -e '  \# Move on to next file after first include'                    \
 526   -e '  close ARGV;'                                                    \
 527   -e '}'                                                                \
 528   -e 'END {exit $$ret}'
 529
 530 # You must include <config.h> before including any other header file.
 531 # This can possibly be via a package-specific header, if given by cfg.mk.
 532 sc_require_config_h_first:
 533         @if $(VC_LIST_EXCEPT) | $(GREP) '\.c$$' > /dev/null; then       \
 534           files=$$($(VC_LIST_EXCEPT) | $(GREP) '\.c$$') &&              \
 535           perl -n $(perl_config_h_first_) $$files ||                    \
 536             { echo '$(ME): the above files include some other header'   \
 537                 'before <config.h>' 1>&2; exit 1; } || :;               \
 538         else :;                                                         \
 539         fi
 540
 541 sc_prohibit_HAVE_MBRTOWC:
 542         @prohibit='\bHAVE_MBRTOWC\b'                                    \
 543         halt="do not use $$prohibit; it is always defined"              \
 544           $(_sc_search_regexp)
 545
 546 # To use this "command" macro, you must first define two shell variables:
 547 # h: the header name, with no enclosing <> or ""
 548 # re: a regular expression that matches IFF something provided by $h is used.
 549 define _sc_header_without_use
 550   dummy=; : so we do not need a semicolon before each use;              \
 551   h_esc=`echo '[<"]'"$$h"'[">]'|$(SED) 's/\./\\\\./g'`;                 \
 552   if $(VC_LIST_EXCEPT) | $(GREP) '\.c$$' > /dev/null; then              \
 553     files=$$($(GREP) -l '^# *include '"$$h_esc"                         \
 554              $$($(VC_LIST_EXCEPT) | $(GREP) '\.c$$')) &&                \
 555     $(GREP) -LE "$$re" $$files | $(GREP) . &&                           \
 556       { echo "$(ME): the above files include $$h but don't use it"      \
 557         1>&2; exit 1; } || :;                                           \
 558   else :;                                                               \
 559   fi
 560 endef
 561
 562 # Prohibit the inclusion of assert.h without an actual use of assert.
 563 sc_prohibit_assert_without_use:
 564         @h='assert.h' re='\<assert *\(' $(_sc_header_without_use)
 565
 566 # Prohibit the inclusion of close-stream.h without an actual use.
 567 sc_prohibit_close_stream_without_use:
 568         @h='close-stream.h' re='\<close_stream *\(' $(_sc_header_without_use)
 569
 570 # Prohibit the inclusion of getopt.h without an actual use.
 571 sc_prohibit_getopt_without_use:
 572         @h='getopt.h' re='\<getopt(_long)? *\(' $(_sc_header_without_use)
 573
 574 # Don't include quotearg.h unless you use one of its functions.
 575 sc_prohibit_quotearg_without_use:
 576         @h='quotearg.h' re='\<quotearg(_[^ ]+)? *\(' $(_sc_header_without_use)
 577
 578 # Don't include quote.h unless you use one of its functions.
 579 sc_prohibit_quote_without_use:
 580         @h='quote.h' re='\<quote((_n)? *\(|_quoting_options\>)' \
 581           $(_sc_header_without_use)
 582
 583 # Don't include this header unless you use one of its functions.
 584 sc_prohibit_long_options_without_use:
 585         @h='long-options.h' re='\<parse_(long_options|gnu_standard_options_only) *\(' \
 586           $(_sc_header_without_use)
 587
 588 # Don't include this header unless you use one of its functions.
 589 sc_prohibit_inttostr_without_use:
 590         @h='inttostr.h' re='\<(off|[iu]max|uint)tostr *\(' \
 591           $(_sc_header_without_use)
 592
 593 # Don't include this header unless you use one of its functions.
 594 sc_prohibit_ignore_value_without_use:
 595         @h='ignore-value.h' re='\<ignore_(value|ptr) *\(' \
 596           $(_sc_header_without_use)
 597
 598 # Don't include this header unless you use one of its functions.
 599 sc_prohibit_error_without_use:
 600         @h='error.h' \
 601         re='\<error(_at_line|_print_progname|_one_per_line|_message_count)? *\('\
 602           $(_sc_header_without_use)
 603
 604 # Don't include xalloc.h unless you use one of its functions.
 605 # Consider these symbols:
 606 # perl -lne '/^# *define (\w+)\(/ and print $1' lib/xalloc.h|grep -v '^__';
 607 # perl -lne '/^(?:extern )?(?:void|char) \*?(\w+) *\(/ and print $1' lib/xalloc.h
 608 # Divide into two sets on case, and filter each through this:
 609 # | sort | perl -MRegexp::Assemble -le \
 610 #  'print Regexp::Assemble->new(file => "/dev/stdin")->as_string'|sed 's/\?://g'
 611 # Note this was produced by the above:
 612 # _xa1 = \
 613 #x(((2n?)?re|c(har)?|n(re|m)|z)alloc|alloc_(oversized|die)|m(alloc|emdup)|strdup)
 614 # But we can do better, in at least two ways:
 615 # 1) take advantage of two "dup"-suffixed strings:
 616 # x(((2n?)?re|c(har)?|n(re|m)|[mz])alloc|alloc_(oversized|die)|(mem|str)dup)
 617 # 2) notice that "c(har)?|[mz]" is equivalent to the shorter and more readable
 618 # "char|[cmz]"
 619 # x(((2n?)?re|char|n(re|m)|[cmz])alloc|alloc_(oversized|die)|(mem|str)dup)
 620 _xa1 = x(((2n?)?re|char|n(re|m)|[cmz])alloc|alloc_(oversized|die)|(mem|str)dup)
 621 _xa2 = X([CZ]|N?M)ALLOC
 622 sc_prohibit_xalloc_without_use:
 623         @h='xalloc.h' \
 624         re='\<($(_xa1)|$(_xa2)) *\('\
 625           $(_sc_header_without_use)
 626
 627 # Extract function names:
 628 # perl -lne '/^(?:extern )?(?:void|char|Hash_table) \*?(\w+) *\(/ and print $1' lib/hash.h
 629 _hash_re = \
 630 hash_(re(set_tuning|move)|xin(itialize|sert)|in(itialize|sert)|get_(firs|nex)t|print_statistics|(delet|fre)e|lookup|clear)
 631 _hash_fn = \<($(_hash_re)) *\(
 632 _hash_struct = (struct )?\<[Hh]ash_(table|tuning)\>
 633 sc_prohibit_hash_without_use:
 634         @h='hash.h' \
 635         re='$(_hash_fn)|$(_hash_struct)'\
 636           $(_sc_header_without_use)
 637
 638 sc_prohibit_cloexec_without_use:
 639         @h='cloexec.h' re='\<(set_cloexec_flag|dup_cloexec) *\(' \
 640           $(_sc_header_without_use)
 641
 642 sc_prohibit_posixver_without_use:
 643         @h='posixver.h' re='\<posix2_version *\(' $(_sc_header_without_use)
 644
 645 sc_prohibit_same_without_use:
 646         @h='same.h' re='\<same_name(at)? *\(' $(_sc_header_without_use)
 647
 648 sc_prohibit_hash_pjw_without_use:
 649         @h='hash-pjw.h' \
 650         re='\<hash_pjw\>' \
 651           $(_sc_header_without_use)
 652
 653 sc_prohibit_safe_read_without_use:
 654         @h='safe-read.h' re='(\<SAFE_READ_ERROR\>|\<safe_read *\()' \
 655           $(_sc_header_without_use)
 656
 657 sc_prohibit_argmatch_without_use:
 658         @h='argmatch.h' \
 659         re='(\<(ARGMATCH_DEFINE_GROUP|ARRAY_CARDINALITY|X?ARGMATCH(|_TO_ARGUMENT|_VERIFY))\>|\<(invalid_arg|argmatch(_exit_fn|_(in)?valid)?) *\()' \
 660           $(_sc_header_without_use)
 661
 662 sc_prohibit_canonicalize_without_use:
 663         @h='canonicalize.h' \
 664         re='CAN_(EXISTING|ALL_BUT_LAST|MISSING)|canonicalize_(mode_t|filename_mode|file_name)' \
 665           $(_sc_header_without_use)
 666
 667 sc_prohibit_root_dev_ino_without_use:
 668         @h='root-dev-ino.h' \
 669         re='(\<ROOT_DEV_INO_(CHECK|WARN)\>|\<get_root_dev_ino *\()' \
 670           $(_sc_header_without_use)
 671
 672 sc_prohibit_openat_without_use:
 673         @h='openat.h' \
 674         re='\<(openat_(permissive|needs_fchdir|(save|restore)_fail)|l?(stat|ch(own|mod))at|(euid)?accessat|(FCHMOD|FCHOWN|STAT)AT_INLINE)\>' \
 675           $(_sc_header_without_use)
 676
 677 # Prohibit the inclusion of c-ctype.h without an actual use.
 678 ctype_re = isalnum|isalpha|isascii|isblank|iscntrl|isdigit|isgraph|islower\
 679 |isprint|ispunct|isspace|isupper|isxdigit|tolower|toupper
 680 sc_prohibit_c_ctype_without_use:
 681         @h='c-ctype.h' re='\<c_($(ctype_re)) *\(' \
 682           $(_sc_header_without_use)
 683
 684 # The following list was generated by running:
 685 # man signal.h|col -b|perl -ne '/bsd_signal.*;/.../sigwaitinfo.*;/ and print' \
 686 #   | perl -lne '/^\s+(?:int|void).*?(\w+).*/ and print $1' | fmt
 687 _sig_functions = \
 688   bsd_signal kill killpg pthread_kill pthread_sigmask raise sigaction \
 689   sigaddset sigaltstack sigdelset sigemptyset sigfillset sighold sigignore \
 690   siginterrupt sigismember signal sigpause sigpending sigprocmask sigqueue \
 691   sigrelse sigset sigsuspend sigtimedwait sigwait sigwaitinfo
 692 _sig_function_re = $(subst $(_sp),|,$(strip $(_sig_functions)))
 693 # The following were extracted from "man signal.h" manually.
 694 _sig_types_and_consts =                                                 \
 695   MINSIGSTKSZ SA_NOCLDSTOP SA_NOCLDWAIT SA_NODEFER SA_ONSTACK           \
 696   SA_RESETHAND SA_RESTART SA_SIGINFO SIGEV_NONE SIGEV_SIGNAL            \
 697   SIGEV_THREAD SIGSTKSZ SIG_BLOCK SIG_SETMASK SIG_UNBLOCK SS_DISABLE    \
 698   SS_ONSTACK mcontext_t pid_t sig_atomic_t sigevent siginfo_t sigset_t  \
 699   sigstack sigval stack_t ucontext_t
 700 # generated via this:
 701 # perl -lne '/^#ifdef (SIG\w+)/ and print $1' lib/sig2str.c|sort -u|fmt -70
 702 _sig_names =                                                            \
 703   SIGABRT SIGALRM SIGALRM1 SIGBUS SIGCANCEL SIGCHLD SIGCLD SIGCONT      \
 704   SIGDANGER SIGDIL SIGEMT SIGFPE SIGFREEZE SIGGRANT SIGHUP SIGILL       \
 705   SIGINFO SIGINT SIGIO SIGIOT SIGKAP SIGKILL SIGKILLTHR SIGLOST SIGLWP  \
 706   SIGMIGRATE SIGMSG SIGPHONE SIGPIPE SIGPOLL SIGPRE SIGPROF SIGPWR      \
 707   SIGQUIT SIGRETRACT SIGSAK SIGSEGV SIGSOUND SIGSTKFLT SIGSTOP SIGSYS   \
 708   SIGTERM SIGTHAW SIGTRAP SIGTSTP SIGTTIN SIGTTOU SIGURG SIGUSR1        \
 709   SIGUSR2 SIGVIRT SIGVTALRM SIGWAITING SIGWINCH SIGWIND SIGWINDOW       \
 710   SIGXCPU SIGXFSZ
 711 _sig_syms_re = $(subst $(_sp),|,$(strip $(_sig_names) $(_sig_types_and_consts)))
 712
 713 # Prohibit the inclusion of signal.h without an actual use.
 714 sc_prohibit_signal_without_use:
 715         @h='signal.h'                                                   \
 716         re='\<($(_sig_function_re)) *\(|\<($(_sig_syms_re))\>'          \
 717           $(_sc_header_without_use)
 718
 719 # Don't include stdio--.h unless you use one of its functions.
 720 sc_prohibit_stdio--_without_use:
 721         @h='stdio--.h' re='\<((f(re)?|p)open|tmpfile) *\('              \
 722           $(_sc_header_without_use)
 723
 724 # Don't include stdio-safer.h unless you use one of its functions.
 725 sc_prohibit_stdio-safer_without_use:
 726         @h='stdio-safer.h' re='\<((f(re)?|p)open|tmpfile)_safer *\('    \
 727           $(_sc_header_without_use)
 728
 729 # Prohibit the inclusion of strings.h without a sensible use.
 730 # Using the likes of bcmp, bcopy, bzero, index or rindex is not sensible.
 731 sc_prohibit_strings_without_use:
 732         @h='strings.h'                                                  \
 733         re='\<(strn?casecmp|ffs(ll)?)\>'                                \
 734           $(_sc_header_without_use)
 735
 736 # Extract the raw list of symbol names with this:
 737 gl_extract_define_simple = \
 738   /^\# *define ([A-Z]\w+)\(/ and print $$1
 739 # Filter out duplicates and convert to a space-separated list:
 740 _intprops_names = \
 741   $(shell f=$(gnulib_dir)/lib/intprops.h;                               \
 742     perl -lne '$(gl_extract_define_simple)' $$f | sort -u | tr '\n' ' ')
 743 # Remove trailing space and convert to a regular expression:
 744 _intprops_syms_re = $(subst $(_sp),|,$(strip $(_intprops_names)))
 745 # Prohibit the inclusion of intprops.h without an actual use.
 746 sc_prohibit_intprops_without_use:
 747         @h='intprops.h'                                                 \
 748         re='\<($(_intprops_syms_re)) *\('                               \
 749           $(_sc_header_without_use)
 750
 751 _stddef_syms_re = NULL|offsetof|ptrdiff_t|size_t|wchar_t
 752 # Prohibit the inclusion of stddef.h without an actual use.
 753 sc_prohibit_stddef_without_use:
 754         @h='stddef.h'                                                   \
 755         re='\<($(_stddef_syms_re))\>'                                   \
 756           $(_sc_header_without_use)
 757
 758 _de1 = dirfd|(close|(fd)?open|read|rewind|seek|tell)dir(64)?(_r)?
 759 _de2 = (versionsort|struct dirent|getdirentries|alphasort|scandir(at)?)(64)?
 760 _de3 = MAXNAMLEN|DIR|ino_t|d_ino|d_fileno|d_namlen
 761 _dirent_syms_re = $(_de1)|$(_de2)|$(_de3)
 762 # Prohibit the inclusion of dirent.h without an actual use.
 763 sc_prohibit_dirent_without_use:
 764         @h='dirent.h'                                                   \
 765         re='\<($(_dirent_syms_re))\>'                                   \
 766           $(_sc_header_without_use)
 767
 768 # Prohibit the inclusion of verify.h without an actual use.
 769 sc_prohibit_verify_without_use:
 770         @h='verify.h'                                                   \
 771         re='\<(verify(true|expr)?|assume|static_assert) *\('            \
 772           $(_sc_header_without_use)
 773
 774 # Don't include xfreopen.h unless you use one of its functions.
 775 sc_prohibit_xfreopen_without_use:
 776         @h='xfreopen.h' re='\<xfreopen *\(' $(_sc_header_without_use)
 777
 778 sc_obsolete_symbols:
 779         @prohibit='\<(HAVE''_FCNTL_H|O''_NDELAY)\>'                     \
 780         halt='do not use HAVE''_FCNTL_H or O'_NDELAY                    \
 781           $(_sc_search_regexp)
 782
 783 # FIXME: warn about definitions of EXIT_FAILURE, EXIT_SUCCESS, STREQ
 784
 785 # Each nonempty ChangeLog line must start with a year number, or a TAB.
 786 sc_changelog:
 787         @prohibit='^[^12        ]'                                      \
 788         in_vc_files='^ChangeLog$$'                                      \
 789         halt='found unexpected prefix in a ChangeLog'                   \
 790           $(_sc_search_regexp)
 791
 792 # Ensure that each .c file containing a "main" function also
 793 # calls bindtextdomain.
 794 sc_bindtextdomain:
 795         @require='bindtextdomain *\('                                   \
 796         in_vc_files='\.c$$'                                             \
 797         containing='\<main *('                                          \
 798         halt='the above files do not call bindtextdomain'               \
 799           $(_sc_search_regexp)
 800
 801 # Require that the final line of each test-lib.sh-using test be this one:
 802 # Exit $fail
 803 # Note: this test requires GNU grep's --label= option.
 804 Exit_witness_file ?= tests/test-lib.sh
 805 Exit_base := $(notdir $(Exit_witness_file))
 806 sc_require_test_exit_idiom:
 807         @if test -f $(srcdir)/$(Exit_witness_file); then                \
 808           die=0;                                                        \
 809           for i in $$($(GREP) -l -F 'srcdir/$(Exit_base)'               \
 810                 $$($(VC_LIST) tests)); do                               \
 811             tail -n1 $$i | $(GREP) '^Exit .' > /dev/null                \
 812               && : || { die=1; echo $$i; }                              \
 813           done;                                                         \
 814           test $$die = 1 &&                                             \
 815             { echo 1>&2 '$(ME): the final line in each of the above is not:'; \
 816               echo 1>&2 'Exit something';                               \
 817               exit 1; } || :;                                           \
 818         fi
 819
 820 sc_trailing_blank:
 821         @prohibit='[     ]$$'                                           \
 822         halt='found trailing blank(s)'                                  \
 823         exclude='^Binary file .* matches$$'                             \
 824           $(_sc_search_regexp)
 825
 826 # Match lines like the following, but where there is only one space
 827 # between the options and the description:
 828 #   -D, --all-repeated[=delimit-method]  print all duplicate lines\n
 829 longopt_re = --[a-z][0-9A-Za-z-]*(\[?=[0-9A-Za-z-]*]?)?
 830 sc_two_space_separator_in_usage:
 831         @prohibit='^   *(-[A-Za-z],)? $(longopt_re) [^ ].*\\$$'         \
 832         halt='help2man requires at least two spaces between an option and its description'\
 833           $(_sc_search_regexp)
 834
 835 # A regexp matching function names like "error" that may be used
 836 # to emit translatable messages.
 837 _gl_translatable_diag_func_re ?= error
 838
 839 # Look for diagnostics that aren't marked for translation.
 840 # This won't find any for which error's format string is on a separate line.
 841 sc_unmarked_diagnostics:
 842         @prohibit='\<$(_gl_translatable_diag_func_re) *\([^"]*"[^"]*[a-z]{3}' \
 843         exclude='(_|ngettext ?)\('                                      \
 844         halt='found unmarked diagnostic(s)'                             \
 845           $(_sc_search_regexp)
 846
 847 # Avoid useless parentheses like those in this example:
 848 # #if defined (SYMBOL) || defined (SYM2)
 849 sc_useless_cpp_parens:
 850         @prohibit='^# *if .*defined *\('                                \
 851         halt='found useless parentheses in cpp directive'               \
 852           $(_sc_search_regexp)
 853
 854 # List headers for which HAVE_HEADER_H is always true, assuming you are
 855 # using the appropriate gnulib module.  CAUTION: for each "unnecessary"
 856 # #if HAVE_HEADER_H that you remove, be sure that your project explicitly
 857 # requires the gnulib module that guarantees the usability of that header.
 858 gl_assured_headers_ = \
 859   cd $(gnulib_dir)/lib && echo *.in.h|$(SED) 's/\.in\.h//g'
 860
 861 # Convert the list of names to upper case, and replace each space with "|".
 862 az_ = abcdefghijklmnopqrstuvwxyz
 863 AZ_ = ABCDEFGHIJKLMNOPQRSTUVWXYZ
 864 gl_header_upper_case_or_ =                                              \
 865   $$($(gl_assured_headers_)                                             \
 866     | tr $(az_)/.- $(AZ_)___                                            \
 867     | tr -s ' ' '|'                                                     \
 868     )
 869 sc_prohibit_always_true_header_tests:
 870         @or=$(gl_header_upper_case_or_);                                \
 871         re="HAVE_($$or)_H";                                             \
 872         prohibit='\<'"$$re"'\>'                                         \
 873         halt=$$(printf '%s\n'                                           \
 874         'do not test the above HAVE_<header>_H symbol(s);'              \
 875         '  with the corresponding gnulib module, they are always true') \
 876           $(_sc_search_regexp)
 877
 878 sc_prohibit_defined_have_decl_tests:
 879         @prohibit='(#[   ]*ifn?def|\<defined)\>[         (]+HAVE_DECL_' \
 880         halt='HAVE_DECL macros are always defined'                      \
 881           $(_sc_search_regexp)
 882
 883 # ==================================================================
 884 gl_other_headers_ ?= \
 885   intprops.h    \
 886   openat.h      \
 887   stat-macros.h
 888
 889 # Perl -lne code to extract "significant" cpp-defined symbols from a
 890 # gnulib header file, eliminating a few common false-positives.
 891 # The exempted names below are defined only conditionally in gnulib,
 892 # and hence sometimes must/may be defined in application code.
 893 gl_extract_significant_defines_ = \
 894   /^\# *define ([^_ (][^ (]*)(\s*\(|\s+\w+)/\
 895     && $$2 !~ /(?:rpl_|_used_without_)/\
 896     && $$1 !~ /^(?:NSIG|ENODATA)$$/\
 897     && $$1 !~ /^(?:SA_RESETHAND|SA_RESTART)$$/\
 898     and print $$1
 899
 900 # Create a list of regular expressions matching the names
 901 # of macros that are guaranteed to be defined by parts of gnulib.
 902 define def_sym_regex
 903         gen_h=$(gl_generated_headers_);                                 \
 904         (cd $(gnulib_dir)/lib;                                          \
 905           for f in *.in.h $(gl_other_headers_); do                      \
 906             test -f $$f                                                 \
 907               && perl -lne '$(gl_extract_significant_defines_)' $$f;    \
 908           done;                                                         \
 909         ) | sort -u                                                     \
 910           | $(SED) 's/^/^ *# *(define|undef)  */;s/$$/\\>/'
 911 endef
 912
 913 # Don't define macros that we already get from gnulib header files.
 914 sc_prohibit_always-defined_macros:
 915         @if test -d $(gnulib_dir); then                                 \
 916           case $$(echo all: | $(GREP) -l -f - Makefile) in Makefile);; *) \
 917             echo '$(ME): skipping $@: you lack GNU grep' 1>&2; exit 0;; \
 918           esac;                                                         \
 919           regex=$$($(def_sym_regex)); export regex;                     \
 920           $(VC_LIST_EXCEPT)                                             \
 921             | xargs sh -c 'echo $$regex | $(GREP) -E -f - "$$@"'        \
 922                 dummy /dev/null                                         \
 923             && { printf '$(ME): define the above'                       \
 924                         ' via some gnulib .h file\n' 1>&2;              \
 925                  exit 1; }                                              \
 926             || :;                                                       \
 927         fi
 928 # ==================================================================
 929
 930 # Prohibit checked in backup files.
 931 sc_prohibit_backup_files:
 932         @$(VC_LIST) | $(GREP) '~$$' &&                                  \
 933           { echo '$(ME): found version controlled backup file' 1>&2;    \
 934             exit 1; } || :
 935
 936 # Require the latest GPL.
 937 sc_GPL_version:
 938         @prohibit='either ''version [^3]'                               \
 939         halt='GPL vN, N!=3'                                             \
 940           $(_sc_search_regexp)
 941
 942 # Require the latest GFDL.  Two regexp, since some .texi files end up
 943 # line wrapping between 'Free Documentation License,' and 'Version'.
 944 _GFDL_regexp = (Free ''Documentation.*Version 1\.[^3]|Version 1\.[^3] or any)
 945 sc_GFDL_version:
 946         @prohibit='$(_GFDL_regexp)'                                     \
 947         halt='GFDL vN, N!=3'                                            \
 948           $(_sc_search_regexp)
 949
 950 # Don't use Texinfo's @acronym{}.
 951 # https://lists.gnu.org/r/bug-gnulib/2010-03/msg00321.html
 952 texinfo_suffix_re_ ?= \.(txi|texi(nfo)?)$$
 953 sc_texinfo_acronym:
 954         @prohibit='@acronym\{'                                          \
 955         in_vc_files='$(texinfo_suffix_re_)'                             \
 956         halt='found use of Texinfo @acronym{}'                          \
 957           $(_sc_search_regexp)
 958
 959 cvs_keywords = \
 960   Author|Date|Header|Id|Name|Locker|Log|RCSfile|Revision|Source|State
 961
 962 sc_prohibit_cvs_keyword:
 963         @prohibit='\$$($(cvs_keywords))\$$'                             \
 964         halt='do not use CVS keyword expansion'                         \
 965           $(_sc_search_regexp)
 966
 967 # This Perl code is slightly obfuscated.  Not only is each "$" doubled
 968 # because it's in a Makefile, but the $$c's are comments;  we cannot
 969 # use "#" due to the way the script ends up concatenated onto one line.
 970 # It would be much more concise, and would produce better output (including
 971 # counts) if written as:
 972 #   perl -ln -0777 -e '/\n(\n+)$/ and print "$ARGV: ".length $1' ...
 973 # but that would be far less efficient, reading the entire contents
 974 # of each file, rather than just the last two bytes of each.
 975 # In addition, while the code below detects both blank lines and a missing
 976 # newline at EOF, the above detects only the former.
 977 #
 978 # This is a perl script that is expected to be the single-quoted argument
 979 # to a command-line "-le".  The remaining arguments are file names.
 980 # Print the name of each file that does not end in exactly one newline byte.
 981 # I.e., warn if there are blank lines (2 or more newlines), or if the
 982 # last byte is not a newline.  However, currently we don't complain
 983 # about any file that contains exactly one byte.
 984 # Exit nonzero if at least one such file is found, otherwise, exit 0.
 985 # Warn about, but otherwise ignore open failure.  Ignore seek/read failure.
 986 #
 987 # Use this if you want to remove trailing empty lines from selected files:
 988 #   perl -pi -0777 -e 's/\n\n+$/\n/' files...
 989 #
 990 require_exactly_one_NL_at_EOF_ =                                        \
 991   foreach my $$f (@ARGV)                                                \
 992     {                                                                   \
 993       open F, "<", $$f or (warn "failed to open $$f: $$!\n"), next;     \
 994       my $$p = sysseek (F, -2, 2);                                      \
 995       my $$c = "seek failure probably means file has < 2 bytes; ignore"; \
 996       my $$last_two_bytes;                                              \
 997       defined $$p and $$p = sysread F, $$last_two_bytes, 2;             \
 998       close F;                                                          \
 999       $$c = "ignore read failure";                                      \
1000       $$p && ($$last_two_bytes eq "\n\n"                                \
1001               || substr ($$last_two_bytes,1) ne "\n")                   \
1002           and (print $$f), $$fail=1;                                    \
1003     }                                                                   \
1004   END { exit defined $$fail }
1005 sc_prohibit_empty_lines_at_EOF:
1006         @$(VC_LIST_EXCEPT)                                              \
1007           | xargs perl -le '$(require_exactly_one_NL_at_EOF_)'          \
1008           || { echo '$(ME): empty line(s) or no newline at EOF' 1>&2;   \
1009                exit 1; }                                                \
1010           || :
1011
1012 # Make sure we don't use st_blocks.  Use ST_NBLOCKS instead.
1013 # This is a bit of a kludge, since it prevents use of the string
1014 # even in comments, but for now it does the job with no false positives.
1015 sc_prohibit_stat_st_blocks:
1016         @prohibit='[.>]st_blocks'                                       \
1017         halt='do not use st_blocks; use ST_NBLOCKS'                     \
1018           $(_sc_search_regexp)
1019
1020 # Make sure we don't define any S_IS* macros in src/*.c files.
1021 # They're already defined via gnulib's sys/stat.h replacement.
1022 sc_prohibit_S_IS_definition:
1023         @prohibit='^ *# *define  *S_IS'                                 \
1024         halt='do not define S_IS* macros; include <sys/stat.h>'         \
1025           $(_sc_search_regexp)
1026
1027 # Perl block to convert a match to FILE_NAME:LINENO:TEST,
1028 # that is shared by two definitions below.
1029 perl_filename_lineno_text_ =                                            \
1030     -e '  {'                                                            \
1031     -e '    $$n = ($$` =~ tr/\n/\n/ + 1);'                              \
1032     -e '    ($$v = $$&) =~ s/\n/\\n/g;'                                 \
1033     -e '    print "$$ARGV:$$n:$$v\n";'                                  \
1034     -e '  }'
1035
1036 prohibit_doubled_words_ = \
1037     the then in an on if is it but for or at and do to can
1038 # expand the regex before running the check to avoid using expensive captures
1039 prohibit_doubled_word_expanded_ = \
1040     $(join $(prohibit_doubled_words_),$(addprefix \s+,$(prohibit_doubled_words_)))
1041 prohibit_doubled_word_RE_ ?= \
1042     /\b(?:$(subst $(_sp),|,$(prohibit_doubled_word_expanded_)))\b/gims
1043 prohibit_doubled_word_ =                                                \
1044     -e 'while ($(prohibit_doubled_word_RE_))'                           \
1045     $(perl_filename_lineno_text_)
1046
1047 # Define this to a regular expression that matches
1048 # any filename:dd:match lines you want to ignore.
1049 # The default is to ignore no matches.
1050 ignore_doubled_word_match_RE_ ?= ^$$
1051
1052 sc_prohibit_doubled_word:
1053         @$(VC_LIST_EXCEPT)                                              \
1054           | xargs perl -n -0777 $(prohibit_doubled_word_)               \
1055           | $(GREP) -vE '$(ignore_doubled_word_match_RE_)'              \
1056           | $(GREP) .                                                   \
1057           && { echo '$(ME): doubled words' 1>&2; exit 1; }              \
1058           || :
1059
1060 # A regular expression matching undesirable combinations of words like
1061 # "can not"; this matches them even when the two words appear on different
1062 # lines, but not when there is an intervening delimiter like "#" or "*".
1063 # Similarly undesirable, "See @xref{...}", since an @xref should start
1064 # a sentence.  Explicitly prohibit any prefix of "see" or "also".
1065 # Also prohibit a prefix matching "\w+ +".
1066 # @pxref gets the same see/also treatment and should be parenthesized;
1067 # presume it must *not* start a sentence.
1068 # POSIX spells it "timestamp" rather than "time\s+stamp", so we do, too.
1069 bad_xref_re_ ?= (?:[\w,:;] +|(?:see|also)\s+)\@xref\{
1070 bad_pxref_re_ ?= (?:[.!?]|(?:see|also))\s+\@pxref\{
1071 prohibit_undesirable_word_seq_RE_ ?=                                    \
1072   /(?:\bcan\s+not\b|\btime\s+stamps?\b|$(bad_xref_re_)|$(bad_pxref_re_))/gims
1073 prohibit_undesirable_word_seq_ =                                        \
1074     -e 'while ($(prohibit_undesirable_word_seq_RE_))'                   \
1075     $(perl_filename_lineno_text_)
1076 # Define this to a regular expression that matches
1077 # any filename:dd:match lines you want to ignore.
1078 # The default is to ignore no matches.
1079 ignore_undesirable_word_sequence_RE_ ?= ^$$
1080
1081 sc_prohibit_undesirable_word_seq:
1082         @$(VC_LIST_EXCEPT)                                              \
1083           | xargs perl -n -0777 $(prohibit_undesirable_word_seq_)       \
1084           | $(GREP) -vE '$(ignore_undesirable_word_sequence_RE_)'       \
1085           | $(GREP) .                                                   \
1086           && { echo '$(ME): undesirable word sequence' >&2; exit 1; }   \
1087           || :
1088
1089 # Except for shell files and for loops, double semicolon is probably a mistake
1090 sc_prohibit_double_semicolon:
1091         @prohibit='; *;[        {} \]*(/[/*]|$$)'                       \
1092         in_vc_files='\.[chly]$$'                                        \
1093         exclude='\bfor *\(.*\)'                                         \
1094         halt="Double semicolon detected"                                \
1095           $(_sc_search_regexp)
1096
1097 _ptm1 = use "test C1 && test C2", not "test C1 -''a C2"
1098 _ptm2 = use "test C1 || test C2", not "test C1 -''o C2"
1099 # Using test's -a and -o operators is not portable.
1100 # We prefer test over [, since the latter is spelled [[ in configure.ac.
1101 sc_prohibit_test_minus_ao:
1102         @prohibit='(\<test| \[+) .+ -[ao] '                             \
1103         halt='$(_ptm1); $(_ptm2)'                                       \
1104           $(_sc_search_regexp)
1105
1106 # Avoid a test bashism.
1107 sc_prohibit_test_double_equal:
1108         @prohibit='(\<test| \[+) .+ == '                                \
1109         containing='#! */bin/[a-z]*sh'                                  \
1110         halt='use "test x = x", not "test x =''= x"'                    \
1111           $(_sc_search_regexp)
1112
1113 # Each program that uses proper_name_utf8 must link with one of the
1114 # ICONV libraries.  Otherwise, some ICONV library must appear in LDADD.
1115 # The perl -0777 invocation below extracts the possibly-multi-line
1116 # definition of LDADD from the appropriate Makefile.am and exits 0
1117 # when it contains "ICONV".
1118 sc_proper_name_utf8_requires_ICONV:
1119         @progs=$$($(VC_LIST_EXCEPT)                                     \
1120                     | xargs $(GREP) -l 'proper_name_utf8 ''("');        \
1121         if test "x$$progs" != x; then                                   \
1122           fail=0;                                                       \
1123           for p in $$progs; do                                          \
1124             dir=$$(dirname "$$p");                                      \
1125             perl -0777                                                  \
1126               -ne 'exit !(/^LDADD =(.+?[^\\]\n)/ms && $$1 =~ /ICONV/)'  \
1127               $$dir/Makefile.am && continue;                            \
1128             base=$$(basename "$$p" .c);                                 \
1129             $(GREP) "$${base}_LDADD.*ICONV)" $$dir/Makefile.am > /dev/null      \
1130               || { fail=1; echo 1>&2 "$(ME): $$p uses proper_name_utf8"; }; \
1131           done;                                                         \
1132           test $$fail = 1 &&                                            \
1133             { echo 1>&2 '$(ME): the above do not link with any ICONV library'; \
1134               exit 1; } || :;                                           \
1135         fi
1136
1137 # Warn about "c0nst struct Foo const foo[]",
1138 # but not about "char const *const foo" or "#define const const".
1139 sc_redundant_const:
1140         @prohibit='\bconst\b[[:space:][:alnum:]]{2,}\bconst\b'          \
1141         halt='redundant "const" in declarations'                        \
1142           $(_sc_search_regexp)
1143
1144 sc_const_long_option:
1145         @prohibit='^ *static.*struct option '                           \
1146         exclude='const struct option|struct option const'               \
1147         halt='add "const" to the above declarations'                    \
1148           $(_sc_search_regexp)
1149
1150 NEWS_hash =                                                             \
1151   $$($(SED) -n '/^\*.* $(PREV_VERSION_REGEXP) ([0-9-]*)/,$$p'           \
1152        $(srcdir)/NEWS                                                   \
1153      | perl -0777 -pe                                                   \
1154         's/^Copyright.+?Free\sSoftware\sFoundation,\sInc\.\n//ms'       \
1155      | md5sum -                                                         \
1156      | $(SED) 's/ .*//')
1157
1158 # Ensure that we don't accidentally insert an entry into an old NEWS block.
1159 sc_immutable_NEWS:
1160         @if test -f $(srcdir)/NEWS; then                                \
1161           test "$(NEWS_hash)" = '$(old_NEWS_hash)' && : ||              \
1162             { echo '$(ME): you have modified old NEWS' 1>&2; exit 1; }; \
1163         fi
1164
1165 # Update the hash stored above.  Do this after each release and
1166 # for any corrections to old entries.
1167 update-NEWS-hash: NEWS
1168         perl -pi -e 's/^(old_NEWS_hash[ \t]+:?=[ \t]+).*/$${1}'"$(NEWS_hash)/" \
1169           $(srcdir)/cfg.mk
1170
1171 # Ensure that we use only the standard $(VAR) notation,
1172 # not @...@ in Makefile.am, now that we can rely on automake
1173 # to emit a definition for each substituted variable.
1174 # However, there is still one case in which @VAR@ use is not just
1175 # legitimate, but actually required: when augmenting an automake-defined
1176 # variable with a prefix.  For example, gettext uses this:
1177 # MAKEINFO = env LANG= LC_MESSAGES= LC_ALL= LANGUAGE= @MAKEINFO@
1178 # otherwise, makeinfo would put German or French (current locale)
1179 # navigation hints in the otherwise-English documentation.
1180 #
1181 # Allow the package to add exceptions via a hook in cfg.mk;
1182 # for example, @PRAGMA_SYSTEM_HEADER@ can be permitted by
1183 # setting this to ' && !/PRAGMA_SYSTEM_HEADER/'.
1184 _makefile_at_at_check_exceptions ?=
1185 sc_makefile_at_at_check:
1186         @perl -ne '/\@\w+\@/'                                           \
1187           -e ' && !/(\w+)\s+=.*\@\1\@$$/'                               \
1188           -e ''$(_makefile_at_at_check_exceptions)                      \
1189           -e 'and (print "$$ARGV:$$.: $$_"), $$m=1; END {exit !$$m}'    \
1190             $$($(VC_LIST_EXCEPT) | $(GREP) -E '(^|/)(Makefile\.am|[^/]+\.mk)$$') \
1191           && { echo '$(ME): use $$(...), not @...@' 1>&2; exit 1; } || :
1192
1193 news-check: NEWS
1194         $(AM_V_GEN)if $(SED) -n $(news-check-lines-spec)p $<            \
1195             | $(GREP) -E $(news-check-regexp) >/dev/null; then          \
1196           :;                                                            \
1197         else                                                            \
1198           echo 'NEWS: $$(news-check-regexp) failed to match' 1>&2;      \
1199           exit 1;                                                       \
1200         fi
1201
1202 sc_makefile_TAB_only_indentation:
1203         @prohibit='^    [ ]{8}'                                         \
1204         in_vc_files='akefile|\.mk$$'                                    \
1205         halt='found TAB-8-space indentation'                            \
1206           $(_sc_search_regexp)
1207
1208 sc_m4_quote_check:
1209         @prohibit='(AC_DEFINE(_UNQUOTED)?|AC_DEFUN)\([^[]'              \
1210         in_vc_files='(^configure\.ac|\.m4)$$'                           \
1211         halt='quote the first arg to AC_DEF*'                           \
1212           $(_sc_search_regexp)
1213
1214 fix_po_file_diag = \
1215 'you have changed the set of files with translatable diagnostics;\n\
1216 apply the above patch\n'
1217
1218 # Generate a list of files in which to search for translatable strings.
1219 perl_translatable_files_list_ =                                         \
1220   -e 'foreach $$file (@ARGV) {'                                         \
1221   -e '  \# Consider only file extensions with one or two letters'       \
1222   -e '  $$file =~ /\...?$$/ or next;'                                   \
1223   -e '  \# Ignore m4 and mk files'                                      \
1224   -e '  $$file =~ /\.m[4k]$$/ and next;'                                \
1225   -e '  \# Ignore a .c or .h file with a corresponding .l or .y file'   \
1226   -e '  $$file =~ /(.+)\.[ch]$$/ && (-e "$${1}.l" || -e "$${1}.y")'     \
1227   -e '    and next;'                                                    \
1228   -e '  \# Skip unreadable files'                                       \
1229   -e '  -r $$file or next;'                                             \
1230   -e '  print "$$file ";'                                               \
1231   -e '}'
1232
1233 # Verify that all source files using _() (more specifically, files that
1234 # match $(_gl_translatable_string_re)) are listed in po/POTFILES.in.
1235 po_file ?= $(srcdir)/po/POTFILES.in
1236 generated_files ?= $(srcdir)/lib/*.[ch]
1237 _gl_translatable_string_re ?= \b(N?_|gettext *)\([^)"]*("|$$)
1238 sc_po_check:
1239         @if test -f $(po_file); then                                    \
1240           $(GREP) -E -v '^(#|$$)' $(po_file)                            \
1241             | $(GREP) -v '^src/false\.c$$' | sort > $@-1;               \
1242           { $(VC_LIST_EXCEPT); echo $(generated_files); }               \
1243             | xargs perl $(perl_translatable_files_list_)               \
1244             | xargs $(GREP) -E -l '$(_gl_translatable_string_re)'       \
1245             | $(SED) 's|^$(_dot_escaped_srcdir)/||'                     \
1246             | sort -u > $@-2;                                           \
1247           diff -u -L $(po_file) -L $(po_file) $@-1 $@-2                 \
1248             || { printf '$(ME): '$(fix_po_file_diag) 1>&2; exit 1; };   \
1249           rm -f $@-1 $@-2;                                              \
1250         fi
1251
1252 # Sometimes it is useful to change the PATH environment variable
1253 # in Makefiles.  When doing so, it's better not to use the Unix-centric
1254 # path separator of ':', but rather the automake-provided '$(PATH_SEPARATOR)'.
1255 msg = 'Do not use ":" above; use $$(PATH_SEPARATOR) instead'
1256 sc_makefile_path_separator_check:
1257         @prohibit='PATH[=].*:'                                          \
1258         in_vc_files='akefile|\.mk$$'                                    \
1259         halt=$(msg)                                                     \
1260           $(_sc_search_regexp)
1261
1262 # Check that 'make alpha' will not fail at the end of the process,
1263 # i.e., when pkg-M.N.tar.xz already exists (either in "." or in ../release)
1264 # and is read-only.
1265 writable-files:
1266         $(AM_V_GEN)if test -d $(release_archive_dir); then              \
1267           for file in $(DIST_ARCHIVES); do                              \
1268             for p in ./ $(release_archive_dir)/; do                     \
1269               test -e $$p$$file || continue;                            \
1270               test -w $$p$$file                                         \
1271                 || { echo ERROR: $$p$$file is not writable; fail=1; };  \
1272             done;                                                       \
1273           done;                                                         \
1274           test "$$fail" && exit 1 || : ;                                \
1275         else :;                                                         \
1276         fi
1277
1278 v_etc_file = $(gnulib_dir)/lib/version-etc.c
1279 sample-test = tests/sample-test
1280 texi = doc/$(PACKAGE).texi
1281 # Make sure that the copyright date in $(v_etc_file) is up to date.
1282 # Do the same for the $(sample-test) and the main doc/.texi file.
1283 sc_copyright_check:
1284         @require='enum { COPYRIGHT_YEAR = '$$(date +%Y)' };'            \
1285         in_files=$(v_etc_file)                                          \
1286         halt='out of date copyright in $(v_etc_file); update it'        \
1287           $(_sc_search_regexp)
1288         @require='# Copyright \(C\) '$$(date +%Y)' Free'                \
1289         in_vc_files=$(sample-test)                                      \
1290         halt='out of date copyright in $(sample-test); update it'       \
1291           $(_sc_search_regexp)
1292         @require='Copyright @copyright\{\} .*'$$(date +%Y)              \
1293         in_vc_files=$(texi)                                             \
1294         halt='out of date copyright in $(texi); update it'              \
1295           $(_sc_search_regexp)
1296
1297 # If tests/help-version exists and seems to be new enough, assume that its
1298 # use of init.sh and path_prepend_ is correct, and ensure that every other
1299 # use of init.sh is identical.
1300 # This is useful because help-version cross-checks prog --version
1301 # with $(VERSION), which verifies that its path_prepend_ invocation
1302 # sets PATH correctly.  This is an inexpensive way to ensure that
1303 # the other init.sh-using tests also get it right.
1304 _hv_file ?= $(srcdir)/tests/help-version
1305 _hv_regex_weak ?= ^ *\. .*/init\.sh"
1306 # Fix syntax-highlighters "
1307 _hv_regex_strong ?= ^ *\. "\$${srcdir=\.}/init\.sh"
1308 sc_cross_check_PATH_usage_in_tests:
1309         @if test -f $(_hv_file); then                                   \
1310           $(GREP) -l 'VERSION mismatch' $(_hv_file) >/dev/null          \
1311             || { echo "$@: skipped: no such file: $(_hv_file)" 1>&2;    \
1312                  exit 0; };                                             \
1313           $(GREP) -lE '$(_hv_regex_strong)' $(_hv_file) >/dev/null      \
1314             || { echo "$@: $(_hv_file) lacks conforming use of init.sh" 1>&2; \
1315                  exit 1; };                                             \
1316           good=$$($(GREP) -E '$(_hv_regex_strong)' $(_hv_file));        \
1317           $(VC_LIST_EXCEPT)                                             \
1318             | xargs $(GREP) -lE '$(_hv_regex_weak)'                     \
1319             | xargs $(GREP) -LFx "$$good"                               \
1320             | $(GREP) .                                                 \
1321             && { printf "$(ME): the above files use"                    \
1322                         " path_prepend_ inconsistently\n" 1>&2;         \
1323                  exit 1; }                                              \
1324             || :;                                                       \
1325         fi
1326
1327 # BRE regex of file contents to identify a test script.
1328 _test_script_regex ?= \<init\.sh\>
1329
1330 # In tests, use "compare expected actual", not the reverse.
1331 sc_prohibit_reversed_compare_failure:
1332         @prohibit='\<compare [^ ]+ ([^ ]*exp|/dev/null)'                \
1333         containing='$(_test_script_regex)'                              \
1334         halt='reversed compare arguments'                               \
1335           $(_sc_search_regexp)
1336
1337 # #if HAVE_... will evaluate to false for any non numeric string.
1338 # That would be flagged by using -Wundef, however gnulib currently
1339 # tests many undefined macros, and so we can't enable that option.
1340 # So at least preclude common boolean strings as macro values.
1341 sc_Wundef_boolean:
1342         @prohibit='^#define.*(yes|no|true|false)$$'                     \
1343         in_files='$(CONFIG_INCLUDE)'                                    \
1344         halt='Use 0 or 1 for macro values'                              \
1345           $(_sc_search_regexp)
1346
1347 # Even if you use pathmax.h to guarantee that PATH_MAX is defined, it might
1348 # not be constant, or might overflow a stack.  In general, use PATH_MAX as
1349 # a limit, not an array or alloca size.
1350 sc_prohibit_path_max_allocation:
1351         @prohibit='(\balloca *\([^)]*|\[[^]]*)\bPATH_MAX'               \
1352         halt='Avoid stack allocations of size PATH_MAX'                 \
1353           $(_sc_search_regexp)
1354
1355 sc_vulnerable_makefile_CVE-2009-4029:
1356         @prohibit='perm -777 -exec chmod a\+rwx|chmod 777 \$$\(distdir\)' \
1357         in_files='(^|/)Makefile\.in$$'                                  \
1358         halt=$$(printf '%s\n'                                           \
1359           'the above files are vulnerable; beware of running'           \
1360           '  "make dist*" rules, and upgrade to fixed automake'         \
1361           '  see https://bugzilla.redhat.com/show_bug.cgi?id=542609 for details') \
1362           $(_sc_search_regexp)
1363
1364 sc_vulnerable_makefile_CVE-2012-3386:
1365         @prohibit='chmod a\+w \$$\(distdir\)'                           \
1366         in_files='(^|/)Makefile\.in$$'                                  \
1367         halt=$$(printf '%s\n'                                           \
1368           'the above files are vulnerable; beware of running'           \
1369           '  "make distcheck", and upgrade to fixed automake'           \
1370           '  see https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-3386 for details') \
1371           $(_sc_search_regexp)
1372
1373 vc-diff-check:
1374         $(AM_V_GEN)(unset CDPATH; cd $(srcdir) && $(VC) diff) > vc-diffs || :
1375         $(AM_V_at)if test -s vc-diffs; then                     \
1376           cat vc-diffs;                                         \
1377           echo "Some files are locally modified:" 1>&2;         \
1378           exit 1;                                               \
1379         else                                                    \
1380           rm vc-diffs;                                          \
1381         fi
1382
1383 rel-files = $(DIST_ARCHIVES)
1384
1385 gnulib-version = $$(cd $(gnulib_dir)                            \
1386                     && { git describe || git rev-parse --short=10 HEAD; } )
1387 bootstrap-tools ?= autoconf,automake,gnulib
1388
1389 gpgv = $$(gpgv2 --version >/dev/null && echo gpgv2 || echo gpgv)
1390 # If it's not already specified, derive the GPG key ID from
1391 # the signed tag we've just applied to mark this release.
1392 gpg_key_ID ?=                                                           \
1393   $$(cd $(srcdir)                                                       \
1394      && git cat-file tag v$(VERSION)                                    \
1395         | $(gpgv) --status-fd 1 --keyring /dev/null - - 2>/dev/null     \
1396         | $(AWK) '/^\[GNUPG:] ERRSIG / {print $$3; exit}')
1397 gpg_key_email ?=                                                        \
1398   $$(gpg --list-key --with-colons $(gpg_key_ID) 2>/dev/null             \
1399         | $(AWK) -F: '/^uid/ {print $$10; exit}'                        \
1400         | $(SED) -n 's/.*<\(.*\)>/\1/p')
1401 gpg_keyring_url ?= https://savannah.gnu.org/project/release-gpgkeys.php?group=$(PACKAGE)&download=1
1402
1403 translation_project_ ?= coordinator@translationproject.org
1404
1405 # Make info-gnu the default only for a stable release.
1406 announcement_Cc_stable = $(translation_project_), $(PACKAGE_BUGREPORT)
1407 announcement_mail_headers_stable =              \
1408   To: info-gnu@gnu.org                          \
1409   Cc: $(announcement_Cc_)                       \
1410   Mail-Followup-To: $(PACKAGE_BUGREPORT)
1411
1412 announcement_Cc_alpha = $(translation_project_)
1413 announcement_mail_headers_alpha =               \
1414   To: $(PACKAGE_BUGREPORT)                      \
1415   Cc: $(announcement_Cc_)
1416
1417 announcement_mail_Cc_beta = $(announcement_mail_Cc_alpha)
1418 announcement_mail_headers_beta = $(announcement_mail_headers_alpha)
1419
1420 announcement_Cc_ ?= $(announcement_Cc_$(release-type))
1421 announcement_mail_headers_ ?= $(announcement_mail_headers_$(release-type))
1422 announcement: NEWS ChangeLog $(rel-files)
1423 # Not $(AM_V_GEN) since the output of this command serves as
1424 # announcement message: it would start with " GEN announcement".
1425         $(AM_V_at)$(srcdir)/$(_build-aux)/announce-gen                  \
1426             --mail-headers='$(announcement_mail_headers_)'              \
1427             --release-type=$(release-type)                              \
1428             --package=$(PACKAGE)                                        \
1429             --prev=$(PREV_VERSION)                                      \
1430             --curr=$(VERSION)                                           \
1431             --gpg-key-id=$(gpg_key_ID)                                  \
1432             $$(test -n "$(gpg_key_email)" &&                            \
1433                echo --gpg-key-email="$(gpg_key_email)")                 \
1434             $$(test -n "$(gpg_keyring_url)" &&                          \
1435                echo --gpg-keyring-url="$(gpg_keyring_url)")             \
1436             --srcdir=$(srcdir)                                          \
1437             --news=$(srcdir)/NEWS                                       \
1438             --bootstrap-tools=$(bootstrap-tools)                        \
1439             $$(case ,$(bootstrap-tools), in (*,gnulib,*)                \
1440                echo --gnulib-version=$(gnulib-version);; esac)          \
1441             $(addprefix --url-dir=, $(url_dir_list))
1442
1443 .PHONY: release-commit
1444 release-commit:
1445         $(AM_V_GEN)cd $(srcdir)                         \
1446           && $(_build-aux)/do-release-commit-and-tag    \
1447                -C $(abs_builddir) $(RELEASE)
1448
1449 ## ---------------- ##
1450 ## Updating files.  ##
1451 ## ---------------- ##
1452
1453 ftp-gnu = https://ftp.gnu.org/gnu
1454 www-gnu = https://www.gnu.org
1455
1456 upload_dest_dir_ ?= $(PACKAGE)
1457 upload_command =                                                \
1458   $(srcdir)/$(_build-aux)/gnupload $(GNUPLOADFLAGS)             \
1459   --to $(gnu_rel_host):$(upload_dest_dir_)                      \
1460   $(rel-files)
1461 emit_upload_commands:
1462         @echo =====================================
1463         @echo =====================================
1464         @echo '$(upload_command)'
1465         @echo '# send the ~/announce-$(my_distdir) e-mail'
1466         @echo =====================================
1467         @echo =====================================
1468
1469 .PHONY: upload
1470 upload:
1471         $(AM_V_GEN)$(upload_command)
1472
1473 define emit-commit-log
1474   printf '%s\n' 'maint: post-release administrivia' ''                  \
1475     '* NEWS: Add header line for next release.'                         \
1476     '* .prev-version: Record previous version.'                         \
1477     '* cfg.mk (old_NEWS_hash): Auto-update.'
1478 endef
1479
1480 .PHONY: no-submodule-changes
1481 no-submodule-changes:
1482         $(AM_V_GEN)if test -d $(srcdir)/.git                            \
1483                 && git --version >/dev/null 2>&1; then                  \
1484           diff=$$(cd $(srcdir) && git submodule -q foreach              \
1485                   git diff-index --name-only HEAD)                      \
1486             || exit 1;                                                  \
1487           case $$diff in '') ;;                                         \
1488             *) echo '$(ME): submodule files are locally modified:';     \
1489                 echo "$$diff"; exit 1;; esac;                           \
1490         else                                                            \
1491           : ;                                                           \
1492         fi
1493
1494 submodule-checks ?= no-submodule-changes public-submodule-commit
1495
1496 # Ensure that each sub-module commit we're using is public.
1497 # Without this, it is too easy to tag and release code that
1498 # cannot be built from a fresh clone.
1499 .PHONY: public-submodule-commit
1500 public-submodule-commit:
1501         $(AM_V_GEN)if test -d $(srcdir)/.git                            \
1502                 && git --version >/dev/null 2>&1; then                  \
1503           cd $(srcdir) &&                                               \
1504           git submodule --quiet foreach                                 \
1505               'test "$$(git rev-parse "$$sha1")"                        \
1506                   = "$$(git merge-base origin "$$sha1")"'               \
1507             || { echo '$(ME): found non-public submodule commit' >&2;   \
1508                  exit 1; };                                             \
1509         else                                                            \
1510           : ;                                                           \
1511         fi
1512 # This rule has a high enough utility/cost ratio that it should be a
1513 # dependent of "check" by default.  However, some of us do occasionally
1514 # commit a temporary change that deliberately points to a non-public
1515 # submodule commit, and want to be able to use rules like "make check".
1516 # In that case, run e.g., "make check gl_public_submodule_commit="
1517 # to disable this test.
1518 gl_public_submodule_commit ?= public-submodule-commit
1519 check: $(gl_public_submodule_commit)
1520
1521 .PHONY: alpha beta stable release
1522 ALL_RECURSIVE_TARGETS += alpha beta stable
1523 alpha beta stable: $(local-check) writable-files $(submodule-checks)
1524         $(AM_V_GEN)test $@ = stable                                     \
1525           && { echo $(VERSION) | $(GREP) -E '^[0-9]+(\.[0-9]+)+$$'      \
1526                || { echo "invalid version string: $(VERSION)" 1>&2; exit 1;};}\
1527           || :
1528         $(AM_V_at)$(MAKE) vc-diff-check
1529         $(AM_V_at)$(MAKE) news-check
1530         $(AM_V_at)$(MAKE) distcheck
1531         $(AM_V_at)$(MAKE) dist
1532         $(AM_V_at)$(MAKE) $(release-prep-hook) RELEASE_TYPE=$@
1533         $(AM_V_at)$(MAKE) -s emit_upload_commands RELEASE_TYPE=$@
1534
1535 release:
1536         $(AM_V_GEN)$(MAKE) _version
1537         $(AM_V_at)$(MAKE) $(release-type)
1538
1539 # Override this in cfg.mk if you follow different procedures.
1540 release-prep-hook ?= release-prep
1541
1542 gl_noteworthy_news_ = * Noteworthy changes in release ?.? (????-??-??) [?]
1543 .PHONY: release-prep
1544 release-prep:
1545         $(AM_V_GEN)$(MAKE) --no-print-directory -s announcement \
1546           > ~/announce-$(my_distdir)
1547         $(AM_V_at)if test -d $(release_archive_dir); then       \
1548           ln $(rel-files) $(release_archive_dir);               \
1549           chmod a-w $(rel-files);                               \
1550         fi
1551         $(AM_V_at)echo $(VERSION) > $(prev_version_file)
1552         $(AM_V_at)$(MAKE) update-NEWS-hash
1553         $(AM_V_at)perl -pi                                              \
1554           -e '$$. == 3 and print "$(gl_noteworthy_news_)\n\n\n"'        \
1555           $(srcdir)/NEWS
1556         $(AM_V_at)msg=$$($(emit-commit-log)) || exit 1;         \
1557         cd $(srcdir) && $(VC) commit -m "$$msg" -a
1558
1559 # Override this with e.g., -s $(srcdir)/some_other_name.texi
1560 # if the default $(PACKAGE)-derived name doesn't apply.
1561 gendocs_options_ ?=
1562
1563 .PHONY: web-manual
1564 web-manual:
1565         $(AM_V_GEN)test -z "$(manual_title)" \
1566           && { echo define manual_title in cfg.mk 1>&2; exit 1; } || :
1567         $(AM_V_at)cd '$(srcdir)/doc'; \
1568           $(SHELL) ../$(_build-aux)/gendocs.sh $(gendocs_options_) \
1569              -o '$(abs_builddir)/doc/manual' \
1570              --email $(PACKAGE_BUGREPORT) $(PACKAGE) \
1571             "$(PACKAGE_NAME) - $(manual_title)"
1572         $(AM_V_at)echo " *** Upload the doc/manual directory to web-cvs."
1573
1574 .PHONY: web-manual-update
1575 web-manual-update:
1576         $(AM_V_GEN)cd $(srcdir) \
1577           && $(_build-aux)/gnu-web-doc-update -C $(abs_builddir)
1578
1579
1580 # Code Coverage
1581
1582 init-coverage:
1583         $(MAKE) $(AM_MAKEFLAGS) clean
1584         lcov --directory . --zerocounters
1585
1586 COVERAGE_CCOPTS ?= "-g --coverage"
1587 COVERAGE_OUT ?= doc/coverage
1588
1589 build-coverage:
1590         $(MAKE) $(AM_MAKEFLAGS) CFLAGS=$(COVERAGE_CCOPTS) CXXFLAGS=$(COVERAGE_CCOPTS)
1591         $(MAKE) $(AM_MAKEFLAGS) CFLAGS=$(COVERAGE_CCOPTS) CXXFLAGS=$(COVERAGE_CCOPTS) check
1592         mkdir -p $(COVERAGE_OUT)
1593         lcov --directory . --output-file $(COVERAGE_OUT)/$(PACKAGE).info \
1594                 --capture
1595
1596 gen-coverage:
1597         genhtml --output-directory $(COVERAGE_OUT) \
1598                 $(COVERAGE_OUT)/$(PACKAGE).info \
1599                 --highlight --frames --legend \
1600                 --title "$(PACKAGE_NAME)"
1601
1602 coverage:
1603         $(MAKE) init-coverage
1604         $(MAKE) build-coverage
1605         $(MAKE) gen-coverage
1606
1607 # Some projects carry local adjustments for gnulib modules via patches in
1608 # a gnulib patch directory whose default name is gl/ (defined in bootstrap
1609 # via local_gl_dir=gl).  Those patches become stale as the originals evolve
1610 # in gnulib.  Use this rule to refresh any stale patches.  It applies each
1611 # patch to the original in $(gnulib_dir) and uses the temporary result to
1612 # generate a fuzz-free .diff file.  If you customize the name of your local
1613 # gnulib patch directory via bootstrap.conf, this rule detects that name.
1614 # Run this from a non-VPATH (i.e., srcdir) build directory.
1615 .PHONY: refresh-gnulib-patches
1616 refresh-gnulib-patches:
1617         gl=gl;                                                          \
1618         if test -f bootstrap.conf; then                                 \
1619           t=$$(perl -lne '/^\s*local_gl_dir=(\S+)/ and $$d=$$1;'        \
1620                -e 'END{defined $$d and print $$d}' bootstrap.conf);     \
1621           test -n "$$t" && gl=$$t;                                      \
1622         fi;                                                             \
1623         for diff in $$(cd $$gl; git ls-files | $(GREP) '\.diff$$'); do  \
1624           b=$$(printf %s "$$diff"|$(SED) 's/\.diff$$//');               \
1625           VERSION_CONTROL=none                                          \
1626             patch "$(gnulib_dir)/$$b" "$$gl/$$diff" || exit 1;          \
1627           ( cd $(gnulib_dir) || exit 1;                                 \
1628             git diff "$$b" > "../$$gl/$$diff";                          \
1629             git checkout $$b ) || exit 1;                               \
1630         done
1631
1632 # Update gettext files.
1633 PACKAGE ?= $(shell basename $(PWD))
1634 PO_DOMAIN ?= $(PACKAGE)
1635 POURL = https://translationproject.org/latest/$(PO_DOMAIN)/
1636 PODIR ?= po
1637 refresh-po:
1638         rm -f $(PODIR)/*.po && \
1639         echo "$(ME): getting translations into po (please ignore the robots.txt ERROR 404)..." && \
1640         wget --no-verbose --directory-prefix $(PODIR) --no-directories --recursive --level 1 --accept .po --accept .po.1 $(POURL) && \
1641         echo 'en@boldquot' > $(PODIR)/LINGUAS && \
1642         echo 'en@quot' >> $(PODIR)/LINGUAS && \
1643         ls $(PODIR)/*.po | $(SED) 's/\.po//;s,$(PODIR)/,,' | \
1644           sort >> $(PODIR)/LINGUAS
1645
1646 # Indentation
1647
1648 indent_args ?= -ppi 1
1649 C_SOURCES ?= $$($(VC_LIST_EXCEPT) | grep '\.[ch]\(.in\)\?$$')
1650 INDENT_SOURCES ?= $(C_SOURCES)
1651 exclude_file_name_regexp--indent ?= $(exclude_file_name_regexp--sc_indent)
1652
1653 .PHONY: indent
1654 indent: # Running indent once is not idempotent, but running it twice is.
1655         $(AM_V_GEN)indent $(indent_args) $(INDENT_SOURCES) && \
1656         indent $(indent_args) $(INDENT_SOURCES)
1657
1658 sc_indent:
1659         @if ! command -v indent > /dev/null; then                       \
1660             echo 1>&2 '$(ME): sc_indent: indent is missing';            \
1661         else                                                            \
1662           fail=0; files="$(INDENT_SOURCES)";                            \
1663           for f in $$files; do                                          \
1664             indent $(indent_args) -st $$f                               \
1665                 | indent $(indent_args) -st -                           \
1666                 | diff -u $$f - || fail=1;                              \
1667           done;                                                         \
1668           test $$fail = 1 &&                                            \
1669             { echo 1>&2 '$(ME): code format error, try "make indent"';  \
1670               exit 1; } || :;                                           \
1671         fi
1672
1673 # If you want to set UPDATE_COPYRIGHT_* environment variables,
1674 # put the assignments in this variable.
1675 update-copyright-env ?=
1676
1677 # Run this rule once per year (usually early in January)
1678 # to update all FSF copyright year lists in your project.
1679 # If you have an additional project-specific rule,
1680 # add it in cfg.mk along with a line 'update-copyright: prereq'.
1681 # By default, exclude all variants of COPYING; you can also
1682 # add exemptions (such as ChangeLog..* for rotated change logs)
1683 # in the file .x-update-copyright.
1684 .PHONY: update-copyright
1685 update-copyright:
1686         $(AM_V_GEN)$(GREP) -l -w Copyright                               \
1687           $$(export VC_LIST_EXCEPT_DEFAULT=COPYING && $(VC_LIST_EXCEPT)) \
1688           | $(update-copyright-env) xargs $(srcdir)/$(_build-aux)/$@
1689
1690 # This tight_scope test is skipped with a warning if $(_gl_TS_headers) is not
1691 # overridden and $(_gl_TS_dir)/Makefile.am does not mention noinst_HEADERS.
1692
1693 # NOTE: to override any _gl_TS_* default value, you must
1694 # define the variable(s) using "export" in cfg.mk.
1695 _gl_TS_dir ?= src
1696
1697 ALL_RECURSIVE_TARGETS += sc_tight_scope
1698 sc_tight_scope: tight-scope.mk
1699         @fail=0;                                                        \
1700         if ! $(GREP) '^ *export _gl_TS_headers *=' $(srcdir)/cfg.mk     \
1701                 > /dev/null                                             \
1702            && ! $(GREP) -w noinst_HEADERS $(srcdir)/$(_gl_TS_dir)/Makefile.am \
1703                 > /dev/null 2>&1; then                                  \
1704             echo '$(ME): skipping $@';                                  \
1705         else                                                            \
1706             $(MAKE) -s -C $(_gl_TS_dir)                                 \
1707                 -f Makefile                                             \
1708                 -f $(abs_top_srcdir)/cfg.mk                             \
1709                 -f $(abs_top_builddir)/$<                               \
1710               _gl_tight_scope                                           \
1711                 || fail=1;                                              \
1712         fi;                                                             \
1713         rm -f $<;                                                       \
1714         exit $$fail
1715
1716 tight-scope.mk: $(ME)
1717         @perl -ne '/^# TS-start/.../^# TS-end/ and print' $(srcdir)/$(ME) > $@-t
1718         @mv $@-t $@
1719
1720 ifeq (a,b)
1721 # TS-start
1722
1723 # Most functions should have static scope.
1724 # Any that don't must be marked with 'extern', but 'main'
1725 # and 'usage' are exceptions: they're always extern, but
1726 # do not need to be marked.  Symbols matching '__.*' are
1727 # reserved by the compiler, so are automatically excluded below.
1728 _gl_TS_unmarked_extern_functions ?= main usage
1729 _gl_TS_function_match ?= /^(?:$(_gl_TS_extern)) +.*?(\w+) *\(/
1730
1731 # If your project uses a macro like "XTERN", then put
1732 # the following in cfg.mk to override this default:
1733 # export _gl_TS_extern = extern|XTERN
1734 _gl_TS_extern ?= extern
1735
1736 # The second nm|grep checks for file-scope variables with 'extern' scope.
1737 # Without gnulib's progname module, you might put program_name here.
1738 # Symbols matching '__.*' are reserved by the compiler,
1739 # so are automatically excluded below.
1740 _gl_TS_unmarked_extern_vars ?=
1741
1742 # NOTE: the _match variables are perl expressions -- not mere regular
1743 # expressions -- so that you can extend them to match other patterns
1744 # and easily extract matched variable names.
1745 # For example, if your project declares some global variables via
1746 # a macro like this: GLOBAL(type, var_name, initializer), then you
1747 # can override this definition to automatically extract those names:
1748 # export _gl_TS_var_match = \
1749 #   /^(?:$(_gl_TS_extern)) .*?\**(\w+)(\[.*?])?;/ || /\bGLOBAL\(.*?,\s*(.*?),/
1750 _gl_TS_var_match ?= /^(?:$(_gl_TS_extern)) .*?(\w+)(\[.*?])?;/
1751
1752 # The names of object files in (or relative to) $(_gl_TS_dir).
1753 _gl_TS_obj_files ?= *.$(OBJEXT)
1754
1755 # Files in which to search for the one-line style extern declarations.
1756 # $(_gl_TS_dir)-relative.
1757 _gl_TS_headers ?= $(noinst_HEADERS)
1758 _gl_TS_other_headers ?= *.h
1759
1760 .PHONY: _gl_tight_scope
1761 _gl_tight_scope: $(bin_PROGRAMS)
1762         sed_wrap='s/^/^_?/;s/$$/$$/';                                   \
1763         t=exceptions-$$$$;                                              \
1764         trap 's=$$?; rm -f $$t; exit $$s' 0;                            \
1765         for sig in 1 2 3 13 15; do                                      \
1766           eval "trap 'v=`expr $$sig + 128`; (exit $$v); exit $$v' $$sig"; \
1767         done;                                                           \
1768         src=`for f in $(SOURCES); do                                    \
1769                test -f $$f && d= || d=$(srcdir)/; echo $$d$$f; done`;   \
1770         hdr=`for f in $(_gl_TS_headers); do                             \
1771                test -f $$f && d= || d=$(srcdir)/; echo $$d$$f; done`;   \
1772         ( printf '%s\n' '__.*' $(_gl_TS_unmarked_extern_functions);     \
1773           $(GREP) -h -A1 '^extern .*[^;]$$' $$src                       \
1774             | $(GREP) -vE '^(extern |--|#)' | $(SED) 's/ .*//; /^$$/d'; \
1775           perl -lne                                                     \
1776              '$(_gl_TS_function_match) and print $$1' $$hdr;            \
1777         ) | sort -u | $(SED) "$$sed_wrap" > $$t;                        \
1778         nm -g $(_gl_TS_obj_files)|$(SED) -n 's/.* T //p'|$(GREP) -Ev -f $$t \
1779           && { echo the above functions should have static scope >&2;   \
1780                exit 1; } || : ;                                         \
1781         ( printf '%s\n' '__.*' main $(_gl_TS_unmarked_extern_vars);     \
1782           perl -lne '$(_gl_TS_var_match) and print $$1'                 \
1783                 $$hdr $(_gl_TS_other_headers)                           \
1784         ) | sort -u | $(SED) "$$sed_wrap" > $$t;                        \
1785         nm -g $(_gl_TS_obj_files) | $(SED) -n 's/.* [BCDGRS] //p'       \
1786             | sort -u | $(GREP) -Ev -f $$t                              \
1787           && { echo the above variables should have static scope >&2;   \
1788                exit 1; } || :
1789 # TS-end
1790 endif