autogen.sh

   1 #!/bin/sh
   2 ### autogen.sh - tool to help build Emacs from a bzr checkout
   3
   4 ## Copyright (C) 2011  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 progs="autoconf automake"
  34
  35 ## Minimum versions we need:
  36 autoconf_min=`sed -n 's/^ *AC_PREREQ(\([0-9\.]*\)).*/\1/p' configure.in`
  37
  38 ## FIXME how to determine this from the sources?
  39 automake_min=1.11
  40
  41
  42 ## $1 = program, eg "autoconf".
  43 ## Echo the version string, eg "2.59".
  44 ## FIXME does not handle things like "1.4a", but AFAIK those are
  45 ## all old versions, so it is OK to fail there.
  46 ## Also note that we do not handle micro versions.
  47 get_version ()
  48 {
  49     $1 --version 2>&1 | sed -n '1 s/.* \([1-9][0-9\.]*\).*/\1/p'
  50 }
  51
  52 ## $1 = version string, eg "2.59"
  53 ## Echo the major version, eg "2".
  54 major_version ()
  55 {
  56     echo $1 | sed -e 's/\([0-9][0-9]*\)\..*/\1/'
  57 }
  58
  59 ## $1 = version string, eg "2.59"
  60 ## Echo the minor version, eg "59".
  61 minor_version ()
  62 {
  63     echo $1 | sed -e 's/[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/'
  64 }
  65
  66 ## $1 = program
  67 ## $2 = minimum version.
  68 ## Return 0 if program is present with version >= minumum version.
  69 ## Return 1 if program is missing.
  70 ## Return 2 if program is present but too old.
  71 ## Return 3 for unexpected error (eg failed to parse version).
  72 check_version ()
  73 {
  74     have_version=`get_version $1`
  75
  76     [ x"$have_version" = x ] && return 1
  77
  78     have_maj=`major_version $have_version`
  79     need_maj=`major_version $2`
  80
  81     [ x"$have_maj" != x ] && [ x"$need_maj" != x ] || return 3
  82
  83     [ $have_maj -gt $need_maj ] && return 0
  84     [ $have_maj -lt $need_maj ] && return 2
  85
  86     have_min=`minor_version $have_version`
  87     need_min=`minor_version $2`
  88
  89     [ x"$have_min" != x ] && [ x"$need_min" != x ] || return 3
  90
  91     [ $have_min -ge $need_min ] && return 0
  92     return 2
  93 }
  94
  95
  96 cat <<EOF
  97 Checking whether you have the necessary tools...
  98 (Read INSTALL.BZR for more details on building Emacs)
  99
 100 EOF
 101
 102 missing=
 103
 104 for prog in $progs; do
 105
 106     eval min=\$${prog}_min
 107
 108     echo "Checking for $prog (need at least version $min)..."
 109
 110     check_version $prog $min
 111
 112     retval=$?
 113
 114     case $retval in
 115         0) stat="ok" ;;
 116         1) stat="missing" ;;
 117         2) stat="too old" ;;
 118         *) stat="unable to check" ;;
 119     esac
 120
 121     echo $stat
 122
 123     if [ $retval -ne 0 ]; then
 124         missing="$missing $prog"
 125         eval ${prog}_why=\""$stat"\"
 126     fi
 127
 128 done
 129
 130
 131 if [ x"$missing" != x ]; then
 132
 133     cat <<EOF
 134
 135 Building Emacs from Bzr requires the following specialized programs:
 136 EOF
 137
 138     for prog in $progs; do
 139         eval min=\$${prog}_min
 140
 141         echo "$prog (minimum version $min)"
 142     done
 143
 144
 145     cat <<EOF
 146
 147 Your system seems to be missing the following tool(s):
 148 EOF
 149
 150     for prog in $missing; do
 151         eval why=\$${prog}_why
 152
 153         echo "$prog ($why)"
 154     done
 155
 156     cat <<EOF
 157
 158 If you think you have the required tools, please add them to your PATH
 159 and re-run this script.
 160
 161 Otherwise, please try installing them.
 162 On systems using rpm and yum, try: "yum install PACKAGE"
 163 On systems using dpkg and apt, try: "apt-get install PACKAGE"
 164 Then re-run this script.
 165
 166 If you do not have permission to do this, or if the version provided
 167 by your system is too old, it is normally straightforward to build
 168 these packages from source.  You can find the sources at:
 169
 170 ftp://ftp.gnu.org/gnu/PACKAGE/
 171
 172 Download the package (make sure you get at least the minimum version
 173 listed above), extract it using tar, then run configure, make,
 174 make install.  Add the installation directory to your PATH and re-run
 175 this script.
 176
 177 If you know that the required versions are in your PATH, but this
 178 script has made an error, then you can simply run
 179
 180 autoreconf -I m4
 181
 182 instead of this script.
 183
 184 If all else fails, you can try using the pre-built versions of the
 185 generated files by doing:
 186
 187 ./autogen/copy_autogen
 188
 189 This is not recommended - see the comments in \`copy_autogen'.
 190
 191 Please report any problems with this script to bug-gnu-emacs@gnu.org .
 192 EOF
 193
 194     exit 1
 195 fi
 196
 197 echo "Your system has the required tools, running autoreconf..."
 198
 199
 200 ## Let autoreconf figure out what, if anything, needs doing.
 201 autoreconf -I m4 || exit $?
 202
 203 echo "You can now run \`./configure'."
 204
 205 exit 0
 206
 207 ### autogen.sh ends here