autogen.sh

   1 #!/bin/sh
   2 ### autogen.sh - tool to help build Emacs from a repository checkout
   3
   4 ## Copyright (C) 2011-2014 Free Software Foundation, Inc.
   5
   6 ## Author: Glenn Morris <rgm@gnu.org>
   7 ## Maintainer: emacs-devel@gnu.org
   8
   9 ## This file is part of GNU Emacs.
  10
  11 ## GNU Emacs is free software: you can redistribute it and/or modify
  12 ## it under the terms of the GNU General Public License as published by
  13 ## the Free Software Foundation, either version 3 of the License, or
  14 ## (at your option) any later version.
  15
  16 ## GNU Emacs is distributed in the hope that it will be useful,
  17 ## but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ## GNU General Public License for more details.
  20
  21 ## You should have received a copy of the GNU General Public License
  22 ## along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ### Commentary:
  25
  26 ## The Emacs repository does not include the configure script (and
  27 ## associated helpers).  The first time you fetch Emacs from the repo,
  28 ## run this script to generate the necessary files.
  29 ## For more details, see the file INSTALL.REPO.
  30
  31 ### Code:
  32
  33 ## Tools we need:
  34 ## Note that we respect the values of AUTOCONF etc, like autoreconf does.
  35 progs="autoconf automake"
  36
  37 ## Minimum versions we need:
  38 autoconf_min=`sed -n 's/^ *AC_PREREQ(\([0-9\.]*\)).*/\1/p' configure.ac`
  39
  40 ## This will need improving if more options are ever added to the
  41 ## AM_INIT_AUTOMAKE call.
  42 automake_min=`sed -n 's/^ *AM_INIT_AUTOMAKE(\([0-9\.]*\)).*/\1/p' configure.ac`
  43
  44
  45 ## $1 = program, eg "autoconf".
  46 ## Echo the version string, eg "2.59".
  47 ## FIXME does not handle things like "1.4a", but AFAIK those are
  48 ## all old versions, so it is OK to fail there.
  49 ## Also note that we do not handle micro versions.
  50 get_version ()
  51 {
  52     ## Remove eg "./autogen.sh: line 50: autoconf: command not found".
  53     $1 --version 2>&1 | sed -e '/not found/d' -n -e '1 s/.* \([1-9][0-9\.]*\).*/\1/p'
  54 }
  55
  56 ## $1 = version string, eg "2.59"
  57 ## Echo the major version, eg "2".
  58 major_version ()
  59 {
  60     echo $1 | sed -e 's/\([0-9][0-9]*\)\..*/\1/'
  61 }
  62
  63 ## $1 = version string, eg "2.59"
  64 ## Echo the minor version, eg "59".
  65 minor_version ()
  66 {
  67     echo $1 | sed -e 's/[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/'
  68 }
  69
  70 ## $1 = program
  71 ## $2 = minimum version.
  72 ## Return 0 if program is present with version >= minimum version.
  73 ## Return 1 if program is missing.
  74 ## Return 2 if program is present but too old.
  75 ## Return 3 for unexpected error (eg failed to parse version).
  76 check_version ()
  77 {
  78     ## Respect eg $AUTOMAKE if it is set, like autoreconf does.
  79     uprog=`echo $1 | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
  80
  81     eval uprog=\$${uprog}
  82
  83     [ x"$uprog" = x ] && uprog=$1
  84
  85     have_version=`get_version $uprog`
  86
  87     [ x"$have_version" = x ] && return 1
  88
  89     have_maj=`major_version $have_version`
  90     need_maj=`major_version $2`
  91
  92     [ x"$have_maj" != x ] && [ x"$need_maj" != x ] || return 3
  93
  94     [ $have_maj -gt $need_maj ] && return 0
  95     [ $have_maj -lt $need_maj ] && return 2
  96
  97     have_min=`minor_version $have_version`
  98     need_min=`minor_version $2`
  99
 100     [ x"$have_min" != x ] && [ x"$need_min" != x ] || return 3
 101
 102     [ $have_min -ge $need_min ] && return 0
 103     return 2
 104 }
 105
 106
 107 cat <<EOF
 108 Checking whether you have the necessary tools...
 109 (Read INSTALL.REPO for more details on building Emacs)
 110
 111 EOF
 112
 113 missing=
 114
 115 for prog in $progs; do
 116
 117     eval min=\$${prog}_min
 118
 119     echo "Checking for $prog (need at least version $min)..."
 120
 121     check_version $prog $min
 122
 123     retval=$?
 124
 125     case $retval in
 126         0) stat="ok" ;;
 127         1) stat="missing" ;;
 128         2) stat="too old" ;;
 129         *) stat="unable to check" ;;
 130     esac
 131
 132     echo $stat
 133
 134     if [ $retval -ne 0 ]; then
 135         missing="$missing $prog"
 136         eval ${prog}_why=\""$stat"\"
 137     fi
 138
 139 done
 140
 141
 142 if [ x"$missing" != x ]; then
 143
 144     cat <<EOF
 145
 146 Building Emacs from the repository requires the following specialized programs:
 147 EOF
 148
 149     for prog in $progs; do
 150         eval min=\$${prog}_min
 151
 152         echo "$prog (minimum version $min)"
 153     done
 154
 155
 156     cat <<EOF
 157
 158 Your system seems to be missing the following tool(s):
 159 EOF
 160
 161     for prog in $missing; do
 162         eval why=\$${prog}_why
 163
 164         echo "$prog ($why)"
 165     done
 166
 167     cat <<EOF
 168
 169 If you think you have the required tools, please add them to your PATH
 170 and re-run this script.
 171
 172 Otherwise, please try installing them.
 173 On systems using rpm and yum, try: "yum install PACKAGE"
 174 On systems using dpkg and apt, try: "apt-get install PACKAGE"
 175 Then re-run this script.
 176
 177 If you do not have permission to do this, or if the version provided
 178 by your system is too old, it is normally straightforward to build
 179 these packages from source.  You can find the sources at:
 180
 181 ftp://ftp.gnu.org/gnu/PACKAGE/
 182
 183 Download the package (make sure you get at least the minimum version
 184 listed above), extract it using tar, then run configure, make,
 185 make install.  Add the installation directory to your PATH and re-run
 186 this script.
 187
 188 If you know that the required versions are in your PATH, but this
 189 script has made an error, then you can simply run
 190
 191 autoreconf -i -I m4
 192
 193 instead of this script.
 194
 195 Please report any problems with this script to bug-gnu-emacs@gnu.org .
 196 EOF
 197
 198     exit 1
 199 fi
 200
 201 echo "Your system has the required tools, running autoreconf..."
 202
 203
 204 ## Let autoreconf figure out what, if anything, needs doing.
 205 autoreconf -i -I m4 || exit $?
 206
 207 ## Create a timestamp, so that './autogen.sh; make' doesn't
 208 ## cause 'make' to needlessly run 'autoheader'.
 209 echo timestamp > src/stamp-h.in || exit
 210
 211 echo "You can now run \`./configure'."
 212
 213 exit 0
 214
 215 ### autogen.sh ends here