autogen.sh

   1 #!/bin/sh
   2 ### autogen.sh - tool to help build Emacs from a bzr checkout
   3
   4 ## Copyright (C) 2011-2012  Free Software Foundation, Inc.
   5
   6 ## Author: Glenn Morris <rgm@gnu.org>
   7
   8 ## This file is part of GNU Emacs.
   9
  10 ## GNU Emacs is free software: you can redistribute it and/or modify
  11 ## it under the terms of the GNU General Public License as published by
  12 ## the Free Software Foundation, either version 3 of the License, or
  13 ## (at your option) any later version.
  14
  15 ## GNU Emacs is distributed in the hope that it will be useful,
  16 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ## GNU General Public License for more details.
  19
  20 ## You should have received a copy of the GNU General Public License
  21 ## along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ### Commentary:
  24
  25 ## The Emacs bzr repository does not include the configure script
  26 ## (and associated helpers).  The first time you fetch Emacs from bzr,
  27 ## run this script to generate the necessary files.
  28 ## For more details, see the file INSTALL.BZR.
  29
  30 ### Code:
  31
  32 ## Tools we need:
  33 ## Note that we respect the values of AUTOCONF etc, like autoreconf does.
  34 progs="autoconf automake"
  35
  36 ## Minimum versions we need:
  37 autoconf_min=`sed -n 's/^ *AC_PREREQ(\([0-9\.]*\)).*/\1/p' configure.ac`
  38
  39 ## FIXME how to determine this from the sources?
  40 automake_min=1.11
  41
  42
  43 ## $1 = program, eg "autoconf".
  44 ## Echo the version string, eg "2.59".
  45 ## FIXME does not handle things like "1.4a", but AFAIK those are
  46 ## all old versions, so it is OK to fail there.
  47 ## Also note that we do not handle micro versions.
  48 get_version ()
  49 {
  50     ## Remove eg "./autogen.sh: line 50: autoconf: command not found".
  51     $1 --version 2>&1 | sed -e '/not found/d' -n -e '1 s/.* \([1-9][0-9\.]*\).*/\1/p'
  52 }
  53
  54 ## $1 = version string, eg "2.59"
  55 ## Echo the major version, eg "2".
  56 major_version ()
  57 {
  58     echo $1 | sed -e 's/\([0-9][0-9]*\)\..*/\1/'
  59 }
  60
  61 ## $1 = version string, eg "2.59"
  62 ## Echo the minor version, eg "59".
  63 minor_version ()
  64 {
  65     echo $1 | sed -e 's/[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/'
  66 }
  67
  68 ## $1 = program
  69 ## $2 = minimum version.
  70 ## Return 0 if program is present with version >= minimum version.
  71 ## Return 1 if program is missing.
  72 ## Return 2 if program is present but too old.
  73 ## Return 3 for unexpected error (eg failed to parse version).
  74 check_version ()
  75 {
  76     ## Respect eg $AUTOMAKE if it is set, like autoreconf does.
  77     uprog=`echo $1 | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
  78
  79     eval uprog=\$${uprog}
  80
  81     [ x"$uprog" = x ] && uprog=$1
  82
  83     have_version=`get_version $uprog`
  84
  85     [ x"$have_version" = x ] && return 1
  86
  87     have_maj=`major_version $have_version`
  88     need_maj=`major_version $2`
  89
  90     [ x"$have_maj" != x ] && [ x"$need_maj" != x ] || return 3
  91
  92     [ $have_maj -gt $need_maj ] && return 0
  93     [ $have_maj -lt $need_maj ] && return 2
  94
  95     have_min=`minor_version $have_version`
  96     need_min=`minor_version $2`
  97
  98     [ x"$have_min" != x ] && [ x"$need_min" != x ] || return 3
  99
 100     [ $have_min -ge $need_min ] && return 0
 101     return 2
 102 }
 103
 104
 105 cat <<EOF
 106 Checking whether you have the necessary tools...
 107 (Read INSTALL.BZR for more details on building Emacs)
 108
 109 EOF
 110
 111 missing=
 112
 113 for prog in $progs; do
 114
 115     eval min=\$${prog}_min
 116
 117     echo "Checking for $prog (need at least version $min)..."
 118
 119     check_version $prog $min
 120
 121     retval=$?
 122
 123     case $retval in
 124         0) stat="ok" ;;
 125         1) stat="missing" ;;
 126         2) stat="too old" ;;
 127         *) stat="unable to check" ;;
 128     esac
 129
 130     echo $stat
 131
 132     if [ $retval -ne 0 ]; then
 133         missing="$missing $prog"
 134         eval ${prog}_why=\""$stat"\"
 135     fi
 136
 137 done
 138
 139
 140 if [ x"$missing" != x ]; then
 141
 142     cat <<EOF
 143
 144 Building Emacs from Bzr requires the following specialized programs:
 145 EOF
 146
 147     for prog in $progs; do
 148         eval min=\$${prog}_min
 149
 150         echo "$prog (minimum version $min)"
 151     done
 152
 153
 154     cat <<EOF
 155
 156 Your system seems to be missing the following tool(s):
 157 EOF
 158
 159     for prog in $missing; do
 160         eval why=\$${prog}_why
 161
 162         echo "$prog ($why)"
 163     done
 164
 165     cat <<EOF
 166
 167 If you think you have the required tools, please add them to your PATH
 168 and re-run this script.
 169
 170 Otherwise, please try installing them.
 171 On systems using rpm and yum, try: "yum install PACKAGE"
 172 On systems using dpkg and apt, try: "apt-get install PACKAGE"
 173 Then re-run this script.
 174
 175 If you do not have permission to do this, or if the version provided
 176 by your system is too old, it is normally straightforward to build
 177 these packages from source.  You can find the sources at:
 178
 179 ftp://ftp.gnu.org/gnu/PACKAGE/
 180
 181 Download the package (make sure you get at least the minimum version
 182 listed above), extract it using tar, then run configure, make,
 183 make install.  Add the installation directory to your PATH and re-run
 184 this script.
 185
 186 If you know that the required versions are in your PATH, but this
 187 script has made an error, then you can simply run
 188
 189 autoreconf -i -I m4
 190
 191 instead of this script.
 192
 193 If all else fails, you can try using the pre-built versions of the
 194 generated files by doing:
 195
 196 ./autogen/copy_autogen
 197
 198 This is not recommended - see the comments in \`copy_autogen'.
 199
 200 Please report any problems with this script to bug-gnu-emacs@gnu.org .
 201 EOF
 202
 203     exit 1
 204 fi
 205
 206 echo "Your system has the required tools, running autoreconf..."
 207
 208
 209 ## Let autoreconf figure out what, if anything, needs doing.
 210 autoreconf -i -I m4 || exit $?
 211
 212 echo "You can now run \`./configure'."
 213
 214 exit 0
 215
 216 ### autogen.sh ends here