bootstrap

   1 #! /bin/sh
   2
   3 # This script helps bootstrap autoconf, when checked out from git.
   4 #
   5 # Copyright (C) 2021-2024 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 # Avoid problems due to various shell wrinkles.
  32 # We assume we have a shell new enough to implement unset correctly.
  33 (set -o posix 2> /dev/null) && set -o posix
  34
  35 PS1='$ '
  36 PS2='> '
  37 PS4='+ '
  38 unset BASH_ENV CDPATH ENV IFS MAIL MAILPATH POSIXLY_CORRECT
  39 unset LANG LANGUAGE LC_ADDRESS LC_COLLATE LC_CTYPE LC_IDENTIFICATION
  40 unset LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
  41 unset LC_TELEPHONE LC_TIME
  42
  43 LC_ALL=C
  44 export LC_ALL
  45
  46 # Set program basename.
  47 me=${0##*/}
  48 usage="usage: $me [options]
  49
  50 Prepare to build a git checkout of autoconf.
  51 Functionally equivalent to \`autoreconf -i\`, but uses autoconf code
  52 from the git checkout itself to create \`configure\`.
  53
  54 Options:
  55   -f, --force      consider all files to be obsolete
  56   -v, --verbose    verbosely report processing (repeat for more detail)
  57 "
  58
  59 # Options.
  60 verbose=
  61 subverbose=
  62 force=
  63 while [ $# -gt 0 ]; do
  64     case "$1" in
  65         (-v | --verbose)
  66             if [ -n "$verbose" ]; then
  67                 subverbose=--verbose
  68             else
  69                 verbose=--verbose
  70             fi
  71         ;;
  72         (-f | --force)
  73             force=--force
  74         ;;
  75         (-h | --help)
  76             printf '%s' "$usage"
  77             exit 0
  78         ;;
  79         (*)
  80             printf '%s' "$usage" >&2
  81             exit 1
  82         ;;
  83     esac
  84     shift
  85 done
  86
  87
  88 # Let the user choose which version of aclocal, automake, m4, and perl to use.
  89 : ${ACLOCAL=aclocal}
  90 : ${AUTOMAKE=automake}
  91 : ${M4=m4}
  92 : ${PERL=perl}
  93 export ACLOCAL AUTOMAKE M4 PERL
  94
  95 # $PERL needs to be an absolute path because we're going to substitute it
  96 # into #! lines.
  97 set fnord $PERL
  98 shift
  99 PERL=$(command -v $1)
 100 shift
 101 if [ $# -gt 0 ]; then
 102     PERL="$PERL $*"
 103 fi
 104
 105 # Override SHELL.  This is required on DJGPP so that Perl's system()
 106 # uses bash, not COMMAND.COM which doesn't quote arguments properly.
 107 # It's not used otherwise.
 108 if test -n "$DJDIR"; then
 109   BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
 110 else
 111   BOOTSTRAP_SHELL=/bin/sh
 112 fi
 113
 114 # Determine whether we have a usable version of M4.
 115 # This rule is pickier than the rule in autoconf's actual configure script.
 116 m4_version="$($M4 --version | head -1)"
 117 case "$m4_version" in
 118   ( *\ 0.*                \
 119   | *\ 1.[0123]           \
 120   | *\ 1.[0123].*         \
 121   | *\ 1.4.[0123456789]   \
 122   | *\ 1.4.1[012345]      \
 123   )
 124     printf '%s\n' "$me: $M4 ($m4_version) is too old" >&2
 125     exit 1
 126     ;;
 127 esac
 128
 129 # Substitutions related to the version of M4 available.
 130 M4_DEBUGFILE=
 131 M4_GNU=
 132 m4_help=$($M4 --help)
 133 case "$m4_help" in
 134   (*--debugfile*)
 135     M4_DEBUGFILE=--debugfile ;;
 136   (*--error-output*)
 137     M4_DEBUGFILE=--error-output ;;
 138 esac
 139 case "$m4_help" in
 140   (*--gnu*)
 141     M4_GNU=--gnu ;;
 142 esac
 143
 144 # Autoconf's version number and identifiers.
 145 RELEASE_YEAR=$(sed -ne 's/^RELEASE_YEAR=\([0-9][0-9]*\)$/\1/p' configure.ac)
 146 VERSION=$(build-aux/git-version-gen .tarball-version)
 147
 148 # PACKAGE_NAME and PACKAGE_BUGREPORT from the bootstrap autoconf can
 149 # get copied into the generated configure script, so we need to get them
 150 # right.  Caution: there is a hard tab in one of the regexes below.
 151 PACKAGE_NAME=$(sed -n < configure.ac \
 152    -e 's/^m4_define(\[autoconf_PACKAGE_NAME], \[\([^]]*\)])$/\1/p')
 153 PACKAGE_BUGREPORT=$(sed -n < configure.ac \
 154    -e 's/^m4_define(\[autoconf_PACKAGE_BUGREPORT], \[\([^]]*\)])$/\1/p')
 155
 156 if [ -z "$RELEASE_YEAR" ]; then
 157     echo "$me: error: could not extract RELEASE_YEAR from configure.ac" >&2
 158     exit 1
 159 fi
 160 if [ -z "$VERSION" ]; then
 161     echo "$me: error: could not compute VERSION" >&2
 162     exit 1
 163 fi
 164 if [ -z "$PACKAGE_NAME" ]; then
 165     echo "$me: error: could not extract PACKAGE_NAME from configure.ac" >&2
 166     exit 1
 167 fi
 168 if [ -z "$PACKAGE_BUGREPORT" ]; then
 169     echo "$me: error: could not extract PACKAGE_BUGREPORT from configure.ac" >&2
 170     exit 1
 171 fi
 172
 173 # PACKAGE_TARNAME and PACKAGE_URL from the bootstrap autoconf should not
 174 # get copied into the configure script.
 175 PACKAGE_URL='<<not available>>'
 176 PACKAGE_TARNAME='<<not available>>'
 177
 178 # Root for temporary partial installation tree.
 179 ACBOOTDIR=$(mktemp -d acboot.XXXXXXXXXX)
 180 ACBOOTDIR=$(realpath $ACBOOTDIR)
 181
 182 # dosubst options infile outfile -- performs the substitutions that
 183 # config.status would perform on INFILE, creating OUTFILE.  INFILE is
 184 # relative to the source directory, OUTFILE is relative to $ACBOOTDIR.
 185 # If OPTIONS is the letter 'x', OUTFILE is made executable after creation.
 186 dosubst ()
 187 {
 188     in=${2##*/}
 189     out="$ACBOOTDIR/$3"
 190     if [ -n "$verbose" ]; then
 191         printf '%s: creating %s\n' "$me" "$out"
 192     fi
 193     rm -f "$out"
 194     sed -e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
 195         -e "s%@M4@%$M4%g" \
 196         -e "s%@M4_DEBUGFILE@%$M4_DEBUGFILE%g" \
 197         -e "s%@M4_GNU@%$M4_GNU%g" \
 198         -e "s%@PACKAGE_BUGREPORT@%$PACKAGE_BUGREPORT%g" \
 199         -e "s%@PACKAGE_NAME@%$PACKAGE_NAME%g" \
 200         -e "s%@PACKAGE_STRING@%$PACKAGE_NAME $VERSION%g" \
 201         -e "s%@PACKAGE_TARNAME@%$PACKAGE_TARNAME%g" \
 202         -e "s%@PACKAGE_URL@%$PACKAGE_URL%g" \
 203         -e "s%@PACKAGE_VERSION@%$VERSION%g" \
 204         -e "s%@PERL@%$PERL%g" \
 205         -e "s%@PERL_FLOCK@%0%g" \
 206         -e "s%@RELEASE_YEAR@%$RELEASE_YEAR%g" \
 207         -e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
 208         -e "s%@VERSION@%$VERSION%g" \
 209         -e "s%@pkgdatadir@%$ACBOOTDIR/lib%g" \
 210         "$2" > "$out"
 211     if [ "$1" = "x" ]; then
 212         chmod +x "$out"
 213     fi
 214 }
 215
 216 # Create the bootstrap installation.
 217 mkdir "$ACBOOTDIR"/bin "$ACBOOTDIR"/lib "$ACBOOTDIR"/tmp
 218 (
 219     cd "$ACBOOTDIR"/lib
 220     for sub in Autom4te autoconf m4sugar ; do
 221         if [ -n "$verbose" ]; then
 222             printf '%s: creating %s\n' "$me" "$ACBOOTDIR/lib/$sub"
 223         fi
 224         ln -s ../../lib/$sub .
 225     done
 226 )
 227
 228 # automake invokes autoconf, and autoconf and aclocal both invoke autom4te,
 229 # so we need to create both of them.
 230 dosubst x bin/autoconf.in bin/autoconf
 231 dosubst x bin/autom4te.in bin/autom4te
 232 dosubst . lib/autom4te.in lib/autom4te.cfg
 233 dosubst . lib/version.in  lib/version.m4
 234
 235 AUTOCONF="$ACBOOTDIR"/bin/autoconf
 236 AUTOM4TE="$ACBOOTDIR/bin/autom4te -M -C $ACBOOTDIR/tmp/autom4te.cache"
 237 export AUTOCONF AUTOM4TE
 238
 239 # We can now do what autoreconf would have done.
 240 # Order is critical -- first aclocal, then autoconf, then automake.
 241 run ()
 242 {
 243     if [ -n "$verbose" ]; then
 244         printf '%s: running %s\n' "$me" "$*"
 245     fi
 246     "$@"
 247 }
 248
 249 run $ACLOCAL -I m4 -Wall -Werror $subverbose $force
 250 run $AUTOCONF -Wall -Werror $subverbose $force
 251 run $AUTOMAKE --add-missing --copy -Wall -Werror $subverbose $force
 252
 253 # Clean up.
 254 rm -rf "$ACBOOTDIR"