doc: tweak README-hacking

[coreutils.git] / cfg.mk

# Customize maint.mk                           -*- makefile -*-
# Copyright (C) 2003-2012 Free Software Foundation, Inc.

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Used in maint.mk's web-manual rule
manual_title = Core GNU utilities

# Use the direct link.  This is guaranteed to work immediately, while
# it can take a while for the faster mirror links to become usable.
url_dir_list = http://ftp.gnu.org/gnu/$(PACKAGE)

# Tests not to run as part of "make distcheck".
local-checks-to-skip = \
  sc_texinfo_acronym

# Tools used to bootstrap this package, used for "announcement".
bootstrap-tools = autoconf,automake,gnulib,bison

# Now that we have better tests, make this the default.
export VERBOSE = yes

# Comparing tarball sizes compressed using different xz presets, we see that
# an -8e-compressed tarball is only 9KiB larger than the -9e-compressed one.
# Using -8e is preferred, since that lets the decompression process use half
# the memory (32MiB rather than 64MiB).
# $ for i in {7,8,9}{e,}; do \
#     (n=$(xz -$i < coreutils-8.15*.tar|wc -c);echo $n $i) & done |sort -nr
# 5129388 7
# 5036524 7e
# 5017476 8
# 5010604 9
# 4923016 8e
# 4914152 9e
export XZ_OPT = -8e

old_NEWS_hash = 45d520a814b59efc0d2f4f56fd10c578

# Add an exemption for sc_makefile_at_at_check.
_makefile_at_at_check_exceptions = ' && !/^cu_install_program =/'

# Our help-version script is in a slightly different location.
_hv_file ?= $(srcdir)/tests/misc/help-version

# Ensure that the list of O_ symbols used to compute O_FULLBLOCK is complete.
dd = $(srcdir)/src/dd.c
sc_dd_O_FLAGS:
        @rm -f $@.1 $@.2
        @{ echo O_FULLBLOCK; echo O_NOCACHE;                            \
          perl -nle '/^ +\| (O_\w*)$$/ and print $$1' $(dd); } | sort > $@.1
        @{ echo O_NOFOLLOW; perl -nle '/{"[a-z]+",\s*(O_\w+)},/ and print $$1' \
          $(dd); } | sort > $@.2
        @diff -u $@.1 $@.2 || diff=1 || diff=;                          \
        rm -f $@.1 $@.2;                                                \
        test "$$diff"                                                   \
          && { echo '$(ME): $(dd) has inconsistent O_ flag lists'>&2;   \
               exit 1; } || :

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

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

# Ensure that each root-requiring test is run via the "check-root" rule.
sc_root_tests:
        @if test -d tests \
              && grep check-root tests/Makefile.am>/dev/null 2>&1; then \
        t1=sc-root.expected; t2=sc-root.actual;                         \
        grep -nl '^ *require_root_$$'                                   \
          $$($(VC_LIST) tests) |sed s,tests/,, |sort > $$t1;            \
        sed -n '/^root_tests =[  ]*\\$$/,/[^\]$$/p'                     \
          $(srcdir)/tests/Makefile.am                                   \
            | sed 's/^  *//;/^root_tests =/d'                           \
            | tr -s '\012\\' '  ' | fmt -1 | sort > $$t2;               \
        diff -u $$t1 $$t2 || diff=1 || diff=;                           \
        rm -f $$t1 $$t2;                                                \
        test "$$diff"                                                   \
          && { echo 'tests/Makefile.am: missing check-root action'>&2;  \
               exit 1; } || :;                                          \
        fi

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

define gl_trap_
  Exit () { set +e; (exit $$1); exit $$1; };                            \
  for sig in 1 2 3 13 15; do                                            \
    eval "trap 'Exit $$(expr $$sig + 128)' $$sig";                      \
  done
endef

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

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

ALL_RECURSIVE_TARGETS += sc_check-AUTHORS
sc_check-AUTHORS:
        @$(MAKE) -s -C src _sc_check-AUTHORS

# Look for lines longer than 80 characters, except omit:
# - program-generated long lines in diff headers,
# - tests involving long checksum lines, and
# - the 'pr' test cases.
LINE_LEN_MAX = 80
FILTER_LONG_LINES =                                             \
  /^[^:]*\.diff:[^:]*:@@ / d;                                   \
  \|^[^:]*tests/misc/sha[0-9]*sum[-:]| d;                       \
  \|^[^:]*tests/pr/|{ \|^[^:]*tests/pr/pr-tests:| !d; };
sc_long_lines:
        @files=$$($(VC_LIST_EXCEPT))                                    \
        halt='line(s) with more than $(LINE_LEN_MAX) characters; reindent'; \
        for file in $$files; do                                         \
          expand $$file | grep -nE '^.{$(LINE_LEN_MAX)}.' |             \
          sed -e "s|^|$$file:|" -e '$(FILTER_LONG_LINES)';              \
        done | grep . && { msg="$$halt" $(_sc_say_and_exit) } || :

# Option descriptions should not start with a capital letter
# One could grep source directly as follows:
# grep -E " {2,6}-.*[^.]  [A-Z][a-z]" $$($(VC_LIST_EXCEPT) | grep '\.c$$')
# but that would miss descriptions not on the same line as the -option.
ALL_RECURSIVE_TARGETS += sc_option_desc_uppercase
sc_option_desc_uppercase:
        @$(MAKE) -s -C src all_programs
        @$(MAKE) -s -C man $@

# Ensure all man/*.[1x] files are present
ALL_RECURSIVE_TARGETS += sc_man_file_correlation
sc_man_file_correlation:
        @$(MAKE) -s -C src all_programs
        @$(MAKE) -s -C man $@

# Ensure that the end of each release's section is marked by two empty lines.
sc_NEWS_two_empty_lines:
        @sed -n 4,/Noteworthy/p $(srcdir)/NEWS                          \
            | perl -n0e '/(^|\n)\n\n\* Noteworthy/ or exit 1'           \
          || { echo '$(ME): use two empty lines to separate NEWS sections' \
                 1>&2; exit 1; } || :

# Perl-based tests used to exec perl from a #!/bin/sh script.
# Now they all start with #!/usr/bin/perl and the portability
# infrastructure is in tests/Makefile.am.  Make sure no old-style
# script sneaks back in.
sc_no_exec_perl_coreutils:
        @if test -f $(srcdir)/tests/Coreutils.pm; then                  \
          grep '^exec  *\$$PERL.*MCoreutils' $$($(VC_LIST) tests) &&    \
            { echo 1>&2 '$(ME): found anachronistic Perl-based tests';  \
              exit 1; } || :;                                           \
        fi

# Don't use "readlink" or "readlinkat" directly
sc_prohibit_readlink:
        @prohibit='\<readlink(at)? \('                                  \
        halt='do not use readlink(at); use via xreadlink or areadlink*' \
          $(_sc_search_regexp)

# Don't use address of "stat" or "lstat" functions
sc_prohibit_stat_macro_address:
        @prohibit='\<l?stat '':|&l?stat\>'                              \
        halt='stat() and lstat() may be function-like macros'           \
          $(_sc_search_regexp)

# Ensure that date's --help output stays in sync with the info
# documentation for GNU strftime.  The only exception is %N,
# which date accepts but GNU strftime does not.
extract_char = sed 's/^[^%][^%]*%\(.\).*/\1/'
sc_strftime_check:
        @if test -f $(srcdir)/src/date.c; then                          \
          grep '^  %.  ' $(srcdir)/src/date.c | sort                    \
            | $(extract_char) > $@-src;                                 \
          { echo N;                                                     \
            info libc date calendar format 2>/dev/null|grep '^    `%.'\'\
              | $(extract_char); } | sort > $@-info;                    \
          if test $$(stat --format %s $@-info) != 2; then               \
            diff -u $@-src $@-info || exit 1;                           \
          else                                                          \
            echo '$(ME): skipping $@: libc info not installed' 1>&2;    \
          fi;                                                           \
          rm -f $@-src $@-info;                                         \
        fi

# Indent only with spaces.
sc_prohibit_tab_based_indentation:
        @prohibit='^ *  '                                               \
        halt='TAB in indentation; use only spaces'                      \
          $(_sc_search_regexp)

# The SEE ALSO section of a man page should not be terminated with
# a period.  Check the first line after each "SEE ALSO" line in man/*.x:
sc_prohibit_man_see_also_period:
        @grep -nB1 '\.$$' $$($(VC_LIST_EXCEPT) | grep 'man/.*\.x$$')    \
            | grep -A1 -e '-\[SEE ALSO\]' | grep '\.$$' &&              \
          { echo '$(ME): do not end "SEE ALSO" section with a period'   \
              1>&2; exit 1; } || :

# Don't use "indent-tabs-mode: nil" anymore.  No longer needed.
sc_prohibit_emacs__indent_tabs_mode__setting:
        @prohibit='^( *[*#] *)?indent-tabs-mode:'                       \
        halt='use of emacs indent-tabs-mode: setting'                   \
          $(_sc_search_regexp)

# Ensure that each file that contains fail=1 also contains fail=0.
# Otherwise, setting file=1 in the environment would make tests fail
# unexpectedly.
sc_prohibit_fail_0:
        @prohibit='\<fail=0\>'                                          \
        halt='fail=0 initialization'                                    \
          $(_sc_search_regexp)

# The mode part of a setfacl -m option argument must be three bytes long.
# I.e., an argument of user:bin:rw or user:bin:r will make Solaris 10's
# setfacl reject it with: "Unrecognized character found in mode field".
# Use hyphens to give it a length of 3: "...:rw-" or "...:r--".
sc_prohibit_short_facl_mode_spec:
        @prohibit='\<setfacl .*-m.*:.*:[rwx-]{1,2} '                    \
        halt='setfacl mode string length < 3; extend with hyphen(s)'    \
          $(_sc_search_regexp)

# Ensure that "stdio--.h" is used where appropriate.
sc_require_stdio_safer:
        @if $(VC_LIST_EXCEPT) | grep -l '\.[ch]$$' > /dev/null; then    \
          files=$$(grep -l '\bfreopen \?(' $$($(VC_LIST_EXCEPT)         \
              | grep '\.[ch]$$'));                                      \
          test -n "$$files" && grep -LE 'include "stdio--.h"' $$files   \
              | grep . &&                                               \
          { echo '$(ME): the above files should use "stdio--.h"'        \
                1>&2; exit 1; } || :;                                   \
        else :;                                                         \
        fi

sc_prohibit_perl_hash_quotes:
        @prohibit="\{'[A-Z_]+' *[=}]"                                   \
        halt="in Perl code, write \$$hash{KEY}, not \$$hash{'K''EY'}"   \
          $(_sc_search_regexp)

# Prefer xnanosleep over other less-precise sleep methods
sc_prohibit_sleep:
        @prohibit='\<(nano|u)?sleep \('                                 \
        halt='prefer xnanosleep over other sleep interfaces'            \
          $(_sc_search_regexp)

# Use print_ver_ (from init.cfg), not open-coded $VERBOSE check.
sc_prohibit_verbose_version:
        @prohibit='test "\$$VERBOSE" = yes && .* --version'             \
        halt='use the print_ver_ function instead...'                   \
          $(_sc_search_regexp)

# Use framework_failure_, not the old name without the trailing underscore.
sc_prohibit_framework_failure:
        @prohibit='\<framework_''failure\>'                             \
        halt='use framework_failure_ instead'                           \
          $(_sc_search_regexp)

# Prohibit the use of `...` in tests/.  Use $(...) instead.
sc_prohibit_test_backticks:
        @prohibit='`' in_vc_files='^tests/'                             \
        halt='use $$(...), not `...` in tests/'                         \
          $(_sc_search_regexp)

# Exempt the contents of any usage function from the following.
_continued_string_col_1 = \
s/^usage .*?\n}//ms;/\\\n\w/ and print ("$$ARGV\n"),$$e=1;END{$$e||=0;exit $$e}
# Ding any source file that has a continued string with an alphabetic in the
# first column of the following line.  We prohibit them because they usually
# trigger false positives in tools that try to map an arbitrary line number
# to the enclosing function name.  Of course, very many strings do precisely
# this, *when they are part of the usage function*.  That is why we exempt
# the contents of any function named "usage".
sc_prohibit_continued_string_alpha_in_column_1:
        @perl -0777 -ne '$(_continued_string_col_1)' \
            $$($(VC_LIST_EXCEPT) | grep '\.[ch]$$') \
          || { echo '$(ME): continued string with word in first column' \
                1>&2; exit 1; } || :
# Use this to list offending lines:
# git ls-files |grep '\.[ch]$' | xargs \
#   perl -n -0777 -e 's/^usage.*?\n}//ms;/\\\n\w/ and print "$ARGV\n"' \
#     | xargs grep -A1 '\\$'|grep '\.[ch][:-][_a-zA-Z]'


###########################################################
_p0 = \([^"'/]\|"\([^\"]\|[\].\)*"\|'\([^\']\|[\].\)*'
_pre = $(_p0)\|[/][^"'/*]\|[/]"\([^\"]\|[\].\)*"\|[/]'\([^\']\|[\].\)*'\)*
_pre_anchored = ^\($(_pre)\)
_comment_and_close = [^*]\|[*][^/*]\)*[*][*]*/
# help font-lock mode: '

# A sed expression that removes ANSI C and ISO C99 comments.
# Derived from the one in GNU gettext's 'moopp' preprocessor.
_sed_remove_comments =                                  \
/[/][/*]/{                                              \
  ta;                                                   \
  :a;                                                   \
  s,$(_pre_anchored)//.*,\1,;                           \
  te;                                                   \
  s,$(_pre_anchored)/[*]\($(_comment_and_close),\1 ,;   \
  ta;                                                   \
  /^$(_pre)[/][*]/{                                     \
    s,$(_pre_anchored)/[*].*,\1 ,;                      \
    tu;                                                 \
    :u;                                                 \
    n;                                                  \
    s,^\($(_comment_and_close),,;                       \
    tv;                                                 \
    s,^.*$$,,;                                          \
    bu;                                                 \
    :v;                                                 \
  };                                                    \
  :e;                                                   \
}
# Quote all single quotes.
_sed_rm_comments_q = $(subst ','\'',$(_sed_remove_comments))
# help font-lock mode: '

_space_before_paren_exempt =? \\n\\$$
_space_before_paren_exempt = \
  (^ *\#|\\n\\$$|%s\(to %s|(date|group|character)\(s\))
# Ensure that there is a space before each open parenthesis in C code.
sc_space_before_open_paren:
        @if $(VC_LIST_EXCEPT) | grep -l '\.[ch]$$' > /dev/null; then    \
          fail=0;                                                       \
          for c in $$($(VC_LIST_EXCEPT) | grep '\.[ch]$$'); do          \
            sed '$(_sed_rm_comments_q)' $$c 2>/dev/null                 \
              | grep -i '[[:alnum:]]('                                  \
              | grep -vE '$(_space_before_paren_exempt)'                \
              | grep . && { fail=1; echo "*** $$c"; };                  \
          done;                                                         \
          test $$fail = 1 &&                                            \
            { echo '$(ME): the above files lack a space-before-open-paren' \
                1>&2; exit 1; } || :;                                   \
        else :;                                                         \
        fi

# Similar to the gnulib maint.mk rule for sc_prohibit_strcmp
# Use STREQ_LEN or STRPREFIX rather than comparing strncmp == 0, or != 0.
sc_prohibit_strncmp:
        @grep -nE '! *str''ncmp *\(|\<str''ncmp *\(.+\) *[!=]='         \
            $$($(VC_LIST_EXCEPT))                                       \
          | grep -vE ':# *define STR(N?EQ_LEN|PREFIX)\(' &&             \
          { echo '$(ME): use STREQ_LEN or STRPREFIX instead of str''ncmp' \
                1>&2; exit 1; } || :

# Enforce recommended preprocessor indentation style.
sc_preprocessor_indentation:
        @if cppi --version >/dev/null 2>&1; then                        \
          $(VC_LIST_EXCEPT) | grep '\.[ch]$$' | xargs cppi -a -c        \
            || { echo '$(ME): incorrect preprocessor indentation' 1>&2; \
                exit 1; };                                              \
        else                                                            \
          echo '$(ME): skipping test $@: cppi not installed' 1>&2;      \
        fi

# Override the default Cc: used in generating an announcement.
announcement_Cc_ = $(translation_project_), \
  coreutils@gnu.org, coreutils-announce@gnu.org

-include $(srcdir)/dist-check.mk

update-copyright-env = \
  UPDATE_COPYRIGHT_FORCE=1 \
  UPDATE_COPYRIGHT_USE_INTERVALS=2 \
  UPDATE_COPYRIGHT_MAX_LINE_LENGTH=79

# List syntax-check exemptions.
exclude_file_name_regexp--sc_space_tab = \
  ^(tests/pr/|tests/misc/nl$$|gl/.*\.diff$$)
exclude_file_name_regexp--sc_bindtextdomain = ^(gl/.*|lib/euidaccess-stat)\.c$$
exclude_file_name_regexp--sc_unmarked_diagnostics =    ^build-aux/cvsu$$
exclude_file_name_regexp--sc_error_message_uppercase = ^build-aux/cvsu$$
exclude_file_name_regexp--sc_trailing_blank = ^tests/pr/
exclude_file_name_regexp--sc_system_h_headers = \
  ^src/((system|copy)\.h|libstdbuf\.c)$$

_src = (false|lbracket|ls-(dir|ls|vdir)|tac-pipe|uname-(arch|uname))
exclude_file_name_regexp--sc_require_config_h_first = \
  (^lib/buffer-lcm\.c|src/$(_src)\.c)$$
exclude_file_name_regexp--sc_require_config_h = \
  $(exclude_file_name_regexp--sc_require_config_h_first)

exclude_file_name_regexp--sc_po_check = ^gl/
exclude_file_name_regexp--sc_prohibit_always-defined_macros = \
  ^src/(seq|remove)\.c$$
exclude_file_name_regexp--sc_prohibit_empty_lines_at_EOF = ^tests/pr/
exclude_file_name_regexp--sc_program_name = ^(gl/.*|lib/euidaccess-stat)\.c$$
exclude_file_name_regexp--sc_file_system = \
  NEWS|^(tests/init\.cfg|src/df\.c|tests/misc/df-P)$$
exclude_file_name_regexp--sc_prohibit_always_true_header_tests = \
  ^m4/stat-prog\.m4$$
exclude_file_name_regexp--sc_prohibit_fail_0 = \
  (^scripts/git-hooks/commit-msg|^tests/init\.sh|Makefile\.am|\.mk)$$
exclude_file_name_regexp--sc_prohibit_atoi_atof = ^lib/euidaccess-stat\.c$$

tbi_1 = ^tests/pr/|(^gl/lib/reg.*\.c\.diff|Makefile(\.am)?|\.mk|^man/help2man)$$
tbi_2 = ^scripts/git-hooks/(pre-commit|pre-applypatch|applypatch-msg)$$
exclude_file_name_regexp--sc_prohibit_tab_based_indentation = \
  $(tbi_1)|$(tbi_2)

exclude_file_name_regexp--sc_preprocessor_indentation = \
  ^(gl/lib/rand-isaac\.[ch]|gl/tests/test-rand-isaac\.c)$$
exclude_file_name_regexp--sc_prohibit_stat_st_blocks = \
  ^(src/system\.h|tests/du/2g)$$

exclude_file_name_regexp--sc_prohibit_continued_string_alpha_in_column_1 = \
  ^src/(system\.h|od\.c|printf\.c)$$

exclude_file_name_regexp--sc_prohibit_test_backticks = \
  ^tests/(init\.sh|check\.mk|misc/stdbuf)$$