bootstrap

   1 #! /bin/sh
   2
   3 # This script helps bootstrap autoconf, when checked out from git.
   4 #
   5 # Copyright (C) 2021-2025 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 2, or (at your option)
  10 # 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 # Autoconf's own configure script is generated using Autoconf.  This
  21 # script does what running `autoreconf -i` in an Autoconf git checkout
  22 # would do, except that it uses autoconf from the source tree we are
  23 # preparing, not any version of autoconf that might or might not be
  24 # installed already.  Note that automake, Perl, and GNU M4 _are_
  25 # required to be installed already.
  26
  27 # Don't ignore failures.
  28 set -e
  29 (set -o pipefail 2> /dev/null) && set -o pipefail
  30
  31 # Error on undefined variables.
  32 (set -u 2> /dev/null) && set -u
  33
  34 # Avoid problems due to various shell wrinkles.
  35 # We assume we have a shell new enough to implement unset correctly.
  36 (set -o posix 2> /dev/null) && set -o posix
  37
  38 PS1='$ '
  39 PS2='> '
  40 PS4='+ '
  41 unset BASH_ENV CDPATH ENV IFS MAIL MAILPATH POSIXLY_CORRECT
  42 unset LANG LANGUAGE LC_ADDRESS LC_COLLATE LC_CTYPE LC_IDENTIFICATION
  43 unset LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
  44 unset LC_TELEPHONE LC_TIME
  45
  46 LC_ALL=C
  47 export LC_ALL
  48
  49 # Set program basename.
  50 me=${0##*/}
  51 usage="usage: $me [options]
  52
  53 Prepare to build a git checkout of autoconf.
  54 Functionally equivalent to \`autoreconf -i\`, but uses autoconf code
  55 from the git checkout itself to create \`configure\`.
  56
  57 Options:
  58   -f, --force      consider all files to be obsolete
  59   -v, --verbose    verbosely report processing (repeat for more detail)
  60 "
  61
  62 # Options.
  63 verbose=
  64 subverbose=
  65 force=
  66 while [ $# -gt 0 ]; do
  67     case "$1" in
  68         (-v | --verbose)
  69             if [ -n "$verbose" ]; then
  70                 subverbose=--verbose
  71             else
  72                 verbose=--verbose
  73             fi
  74         ;;
  75         (-f | --force)
  76             force=--force
  77         ;;
  78         (-h | --help)
  79             printf '%s' "$usage"
  80             exit 0
  81         ;;
  82         (*)
  83             printf '%s' "$usage" >&2
  84             exit 1
  85         ;;
  86     esac
  87     shift
  88 done
  89
  90
  91 # Let the user choose which version of aclocal, automake, m4, and perl to use.
  92 : ${ACLOCAL=aclocal}
  93 : ${AUTOMAKE=automake}
  94 : ${M4=m4}
  95 : ${PERL=perl}
  96 export ACLOCAL AUTOMAKE M4 PERL
  97
  98 # Allow 'ln -s' to be overridden by the user.
  99 : ${LN_S="ln -s"}
 100 export LN_S
 101
 102 # $PERL needs to be an absolute path because we're going to substitute it
 103 # into #! lines.
 104 set fnord $PERL
 105 shift
 106 PERL=$(command -v $1)
 107 shift
 108 if [ $# -gt 0 ]; then
 109     PERL="$PERL $*"
 110 fi
 111
 112 # Override SHELL.  This is required on DJGPP so that Perl's system()
 113 # uses bash, not COMMAND.COM which doesn't quote arguments properly.
 114 # It's not used otherwise.
 115 if test -n "${DJDIR-}"; then
 116   BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
 117 else
 118   BOOTSTRAP_SHELL=/bin/sh
 119 fi
 120
 121 # Determine whether we have a usable version of M4.
 122 # This rule is pickier than the rule in autoconf's actual configure script.
 123 m4_version="$($M4 --version | head -1)"
 124 case "$m4_version" in
 125   ( *\ 0.*                \
 126   | *\ 1.[0123]           \
 127   | *\ 1.[0123].*         \
 128   | *\ 1.4.[0123456789]   \
 129   | *\ 1.4.1[012345]      \
 130   )
 131     printf '%s\n' "$me: $M4 ($m4_version) is too old" >&2
 132     exit 1
 133     ;;
 134 esac
 135
 136 # Substitutions related to the version of M4 available.
 137 M4_DEBUGFILE=
 138 M4_GNU=
 139 m4_help=$($M4 --help)
 140 case "$m4_help" in
 141   (*--debugfile*)
 142     M4_DEBUGFILE=--debugfile ;;
 143   (*--error-output*)
 144     M4_DEBUGFILE=--error-output ;;
 145 esac
 146 case "$m4_help" in
 147   (*--gnu*)
 148     M4_GNU=--gnu ;;
 149 esac
 150
 151 # Autoconf's version number and identifiers.
 152 RELEASE_YEAR=$(sed -ne 's/^RELEASE_YEAR=\([0-9][0-9]*\)$/\1/p' configure.ac)
 153 VERSION=$(build-aux/git-version-gen .tarball-version)
 154
 155 # PACKAGE_NAME and PACKAGE_BUGREPORT from the bootstrap autoconf can
 156 # get copied into the generated configure script, so we need to get them
 157 # right.  Caution: there is a hard tab in one of the regexes below.
 158 PACKAGE_NAME=$(sed -n < configure.ac \
 159    -e 's/^m4_define(\[autoconf_PACKAGE_NAME], \[\([^]]*\)])$/\1/p')
 160 PACKAGE_BUGREPORT=$(sed -n < configure.ac \
 161    -e 's/^m4_define(\[autoconf_PACKAGE_BUGREPORT], \[\([^]]*\)])$/\1/p')
 162
 163 if [ -z "$RELEASE_YEAR" ]; then
 164     printf >&2 '%s\n' \
 165       "$me: error: could not extract RELEASE_YEAR from configure.ac"
 166     exit 1
 167 fi
 168 if [ -z "$VERSION" ]; then
 169     printf >&2 '%s\n' "$me: error: could not compute VERSION"
 170     exit 1
 171 fi
 172 if [ -z "$PACKAGE_NAME" ]; then
 173     printf >&2 '%s\n' \
 174       "$me: error: could not extract PACKAGE_NAME from configure.ac"
 175     exit 1
 176 fi
 177 if [ -z "$PACKAGE_BUGREPORT" ]; then
 178     printf >&2 '%s\n' \
 179       "$me: error: could not extract PACKAGE_BUGREPORT from configure.ac"
 180     exit 1
 181 fi
 182
 183 # PACKAGE_TARNAME and PACKAGE_URL from the bootstrap autoconf should not
 184 # get copied into the configure script.
 185 PACKAGE_URL='<<not available>>'
 186 PACKAGE_TARNAME='<<not available>>'
 187
 188 # Root for temporary partial installation tree.
 189 ACBOOTDIR=$(mktemp -d acboot.XXXXXXXXXX)
 190 ACBOOTDIR=$(realpath $ACBOOTDIR)
 191
 192 # dosubst options infile outfile -- performs the substitutions that
 193 # config.status would perform on INFILE, creating OUTFILE.  INFILE is
 194 # relative to the source directory, OUTFILE is relative to $ACBOOTDIR.
 195 # If OPTIONS is the letter 'x', OUTFILE is made executable after creation.
 196 dosubst ()
 197 {
 198     in=${2##*/}
 199     out="$ACBOOTDIR/$3"
 200     if [ -n "$verbose" ]; then
 201         printf '%s: creating %s\n' "$me" "$out"
 202     fi
 203     rm -f "$out"
 204     sed -e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
 205         -e "s%@M4@%$M4%g" \
 206         -e "s%@M4_DEBUGFILE@%$M4_DEBUGFILE%g" \
 207         -e "s%@M4_GNU@%$M4_GNU%g" \
 208         -e "s%@PACKAGE_BUGREPORT@%$PACKAGE_BUGREPORT%g" \
 209         -e "s%@PACKAGE_NAME@%$PACKAGE_NAME%g" \
 210         -e "s%@PACKAGE_STRING@%$PACKAGE_NAME $VERSION%g" \
 211         -e "s%@PACKAGE_TARNAME@%$PACKAGE_TARNAME%g" \
 212         -e "s%@PACKAGE_URL@%$PACKAGE_URL%g" \
 213         -e "s%@PACKAGE_VERSION@%$VERSION%g" \
 214         -e "s%@PERL@%$PERL%g" \
 215         -e "s%@PERL_FLOCK@%0%g" \
 216         -e "s%@RELEASE_YEAR@%$RELEASE_YEAR%g" \
 217         -e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
 218         -e "s%@VERSION@%$VERSION%g" \
 219         -e "s%@pkgdatadir@%$ACBOOTDIR/lib%g" \
 220         "$2" > "$out"
 221     if [ "$1" = "x" ]; then
 222         chmod +x "$out"
 223     fi
 224 }
 225
 226 # Create the bootstrap installation.
 227 mkdir "$ACBOOTDIR"/bin "$ACBOOTDIR"/lib "$ACBOOTDIR"/tmp
 228 (
 229     cd "$ACBOOTDIR"/lib
 230     for sub in Autom4te autoconf m4sugar ; do
 231         if [ -n "$verbose" ]; then
 232             printf '%s: creating %s\n' "$me" "$ACBOOTDIR/lib/$sub"
 233         fi
 234         $LN_S ../../lib/$sub .
 235     done
 236 )
 237
 238 # automake invokes autoconf, and autoconf and aclocal both invoke autom4te,
 239 # so we need to create both of them.
 240 dosubst x bin/autoconf.in bin/autoconf
 241 dosubst x bin/autom4te.in bin/autom4te
 242 dosubst . lib/autom4te.in lib/autom4te.cfg
 243 dosubst . lib/version.in  lib/version.m4
 244
 245 AUTOCONF="$ACBOOTDIR"/bin/autoconf
 246 AUTOM4TE="$ACBOOTDIR/bin/autom4te -M -C $ACBOOTDIR/tmp/autom4te.cache"
 247 export AUTOCONF AUTOM4TE
 248
 249 # We can now do what autoreconf would have done.
 250 # Order is critical -- first aclocal, then autoconf, then automake.
 251 run ()
 252 {
 253     if [ -n "$verbose" ]; then
 254         printf '%s: running %s\n' "$me" "$*"
 255     fi
 256     "$@"
 257 }
 258
 259 run $ACLOCAL -I m4 -Wall -Werror $subverbose $force
 260 run $AUTOCONF -Wall -Werror $subverbose $force
 261 run $AUTOMAKE --add-missing --copy -Wall -Werror $subverbose $force
 262
 263 # Clean up.
 264 rm -rf "$ACBOOTDIR"