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 # Allow 'ln -s' to be overridden by the user.
  96 : ${LN_S="ln -s"}
  97 export LN_S
  98
  99 # $PERL needs to be an absolute path because we're going to substitute it
 100 # into #! lines.
 101 set fnord $PERL
 102 shift
 103 PERL=$(command -v $1)
 104 shift
 105 if [ $# -gt 0 ]; then
 106     PERL="$PERL $*"
 107 fi
 108
 109 # Override SHELL.  This is required on DJGPP so that Perl's system()
 110 # uses bash, not COMMAND.COM which doesn't quote arguments properly.
 111 # It's not used otherwise.
 112 if test -n "$DJDIR"; then
 113   BOOTSTRAP_SHELL=/dev/env/DJDIR/bin/bash.exe
 114 else
 115   BOOTSTRAP_SHELL=/bin/sh
 116 fi
 117
 118 # Determine whether we have a usable version of M4.
 119 # This rule is pickier than the rule in autoconf's actual configure script.
 120 m4_version="$($M4 --version | head -1)"
 121 case "$m4_version" in
 122   ( *\ 0.*                \
 123   | *\ 1.[0123]           \
 124   | *\ 1.[0123].*         \
 125   | *\ 1.4.[0123456789]   \
 126   | *\ 1.4.1[012345]      \
 127   )
 128     printf '%s\n' "$me: $M4 ($m4_version) is too old" >&2
 129     exit 1
 130     ;;
 131 esac
 132
 133 # Substitutions related to the version of M4 available.
 134 M4_DEBUGFILE=
 135 M4_GNU=
 136 m4_help=$($M4 --help)
 137 case "$m4_help" in
 138   (*--debugfile*)
 139     M4_DEBUGFILE=--debugfile ;;
 140   (*--error-output*)
 141     M4_DEBUGFILE=--error-output ;;
 142 esac
 143 case "$m4_help" in
 144   (*--gnu*)
 145     M4_GNU=--gnu ;;
 146 esac
 147
 148 # Autoconf's version number and identifiers.
 149 RELEASE_YEAR=$(sed -ne 's/^RELEASE_YEAR=\([0-9][0-9]*\)$/\1/p' configure.ac)
 150 VERSION=$(build-aux/git-version-gen .tarball-version)
 151
 152 # PACKAGE_NAME and PACKAGE_BUGREPORT from the bootstrap autoconf can
 153 # get copied into the generated configure script, so we need to get them
 154 # right.  Caution: there is a hard tab in one of the regexes below.
 155 PACKAGE_NAME=$(sed -n < configure.ac \
 156    -e 's/^m4_define(\[autoconf_PACKAGE_NAME], \[\([^]]*\)])$/\1/p')
 157 PACKAGE_BUGREPORT=$(sed -n < configure.ac \
 158    -e 's/^m4_define(\[autoconf_PACKAGE_BUGREPORT], \[\([^]]*\)])$/\1/p')
 159
 160 if [ -z "$RELEASE_YEAR" ]; then
 161     echo "$me: error: could not extract RELEASE_YEAR from configure.ac" >&2
 162     exit 1
 163 fi
 164 if [ -z "$VERSION" ]; then
 165     echo "$me: error: could not compute VERSION" >&2
 166     exit 1
 167 fi
 168 if [ -z "$PACKAGE_NAME" ]; then
 169     echo "$me: error: could not extract PACKAGE_NAME from configure.ac" >&2
 170     exit 1
 171 fi
 172 if [ -z "$PACKAGE_BUGREPORT" ]; then
 173     echo "$me: error: could not extract PACKAGE_BUGREPORT from configure.ac" >&2
 174     exit 1
 175 fi
 176
 177 # PACKAGE_TARNAME and PACKAGE_URL from the bootstrap autoconf should not
 178 # get copied into the configure script.
 179 PACKAGE_URL='<<not available>>'
 180 PACKAGE_TARNAME='<<not available>>'
 181
 182 # Root for temporary partial installation tree.
 183 ACBOOTDIR=$(mktemp -d acboot.XXXXXXXXXX)
 184 ACBOOTDIR=$(realpath $ACBOOTDIR)
 185
 186 # dosubst options infile outfile -- performs the substitutions that
 187 # config.status would perform on INFILE, creating OUTFILE.  INFILE is
 188 # relative to the source directory, OUTFILE is relative to $ACBOOTDIR.
 189 # If OPTIONS is the letter 'x', OUTFILE is made executable after creation.
 190 dosubst ()
 191 {
 192     in=${2##*/}
 193     out="$ACBOOTDIR/$3"
 194     if [ -n "$verbose" ]; then
 195         printf '%s: creating %s\n' "$me" "$out"
 196     fi
 197     rm -f "$out"
 198     sed -e "s%@configure_input@%Generated from $in; do not edit by hand.%g" \
 199         -e "s%@M4@%$M4%g" \
 200         -e "s%@M4_DEBUGFILE@%$M4_DEBUGFILE%g" \
 201         -e "s%@M4_GNU@%$M4_GNU%g" \
 202         -e "s%@PACKAGE_BUGREPORT@%$PACKAGE_BUGREPORT%g" \
 203         -e "s%@PACKAGE_NAME@%$PACKAGE_NAME%g" \
 204         -e "s%@PACKAGE_STRING@%$PACKAGE_NAME $VERSION%g" \
 205         -e "s%@PACKAGE_TARNAME@%$PACKAGE_TARNAME%g" \
 206         -e "s%@PACKAGE_URL@%$PACKAGE_URL%g" \
 207         -e "s%@PACKAGE_VERSION@%$VERSION%g" \
 208         -e "s%@PERL@%$PERL%g" \
 209         -e "s%@PERL_FLOCK@%0%g" \
 210         -e "s%@RELEASE_YEAR@%$RELEASE_YEAR%g" \
 211         -e "s%@SHELL@%$BOOTSTRAP_SHELL%g" \
 212         -e "s%@VERSION@%$VERSION%g" \
 213         -e "s%@pkgdatadir@%$ACBOOTDIR/lib%g" \
 214         "$2" > "$out"
 215     if [ "$1" = "x" ]; then
 216         chmod +x "$out"
 217     fi
 218 }
 219
 220 # Create the bootstrap installation.
 221 mkdir "$ACBOOTDIR"/bin "$ACBOOTDIR"/lib "$ACBOOTDIR"/tmp
 222 (
 223     cd "$ACBOOTDIR"/lib
 224     for sub in Autom4te autoconf m4sugar ; do
 225         if [ -n "$verbose" ]; then
 226             printf '%s: creating %s\n' "$me" "$ACBOOTDIR/lib/$sub"
 227         fi
 228         $LN_S ../../lib/$sub .
 229     done
 230 )
 231
 232 # automake invokes autoconf, and autoconf and aclocal both invoke autom4te,
 233 # so we need to create both of them.
 234 dosubst x bin/autoconf.in bin/autoconf
 235 dosubst x bin/autom4te.in bin/autom4te
 236 dosubst . lib/autom4te.in lib/autom4te.cfg
 237 dosubst . lib/version.in  lib/version.m4
 238
 239 AUTOCONF="$ACBOOTDIR"/bin/autoconf
 240 AUTOM4TE="$ACBOOTDIR/bin/autom4te -M -C $ACBOOTDIR/tmp/autom4te.cache"
 241 export AUTOCONF AUTOM4TE
 242
 243 # We can now do what autoreconf would have done.
 244 # Order is critical -- first aclocal, then autoconf, then automake.
 245 run ()
 246 {
 247     if [ -n "$verbose" ]; then
 248         printf '%s: running %s\n' "$me" "$*"
 249     fi
 250     "$@"
 251 }
 252
 253 run $ACLOCAL -I m4 -Wall -Werror $subverbose $force
 254 run $AUTOCONF -Wall -Werror $subverbose $force
 255 run $AUTOMAKE --add-missing --copy -Wall -Werror $subverbose $force
 256
 257 # Clean up.
 258 rm -rf "$ACBOOTDIR"