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 ## This will need improving if more options are ever added to the
  40 ## AM_INIT_AUTOMAKE call.
  41 automake_min=`sed -n 's/^ *AM_INIT_AUTOMAKE(\([0-9\.]*\)).*/\1/p' configure.ac`
  42
  43
  44 ## $1 = program, eg "autoconf".
  45 ## Echo the version string, eg "2.59".
  46 ## FIXME does not handle things like "1.4a", but AFAIK those are
  47 ## all old versions, so it is OK to fail there.
  48 ## Also note that we do not handle micro versions.
  49 get_version ()
  50 {
  51     ## Remove eg "./autogen.sh: line 50: autoconf: command not found".
  52     $1 --version 2>&1 | sed -e '/not found/d' -n -e '1 s/.* \([1-9][0-9\.]*\).*/\1/p'
  53 }
  54
  55 ## $1 = version string, eg "2.59"
  56 ## Echo the major version, eg "2".
  57 major_version ()
  58 {
  59     echo $1 | sed -e 's/\([0-9][0-9]*\)\..*/\1/'
  60 }
  61
  62 ## $1 = version string, eg "2.59"
  63 ## Echo the minor version, eg "59".
  64 minor_version ()
  65 {
  66     echo $1 | sed -e 's/[0-9][0-9]*\.\([0-9][0-9]*\).*/\1/'
  67 }
  68
  69 ## $1 = program
  70 ## $2 = minimum version.
  71 ## Return 0 if program is present with version >= minimum version.
  72 ## Return 1 if program is missing.
  73 ## Return 2 if program is present but too old.
  74 ## Return 3 for unexpected error (eg failed to parse version).
  75 check_version ()
  76 {
  77     ## Respect eg $AUTOMAKE if it is set, like autoreconf does.
  78     uprog=`echo $1 | sed 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
  79
  80     eval uprog=\$${uprog}
  81
  82     [ x"$uprog" = x ] && uprog=$1
  83
  84     have_version=`get_version $uprog`
  85
  86     [ x"$have_version" = x ] && return 1
  87
  88     have_maj=`major_version $have_version`
  89     need_maj=`major_version $2`
  90
  91     [ x"$have_maj" != x ] && [ x"$need_maj" != x ] || return 3
  92
  93     [ $have_maj -gt $need_maj ] && return 0
  94     [ $have_maj -lt $need_maj ] && return 2
  95
  96     have_min=`minor_version $have_version`
  97     need_min=`minor_version $2`
  98
  99     [ x"$have_min" != x ] && [ x"$need_min" != x ] || return 3
 100
 101     [ $have_min -ge $need_min ] && return 0
 102     return 2
 103 }
 104
 105
 106 cat <<EOF
 107 Checking whether you have the necessary tools...
 108 (Read INSTALL.BZR for more details on building Emacs)
 109
 110 EOF
 111
 112 missing=
 113
 114 for prog in $progs; do
 115
 116     eval min=\$${prog}_min
 117
 118     echo "Checking for $prog (need at least version $min)..."
 119
 120     check_version $prog $min
 121
 122     retval=$?
 123
 124     case $retval in
 125         0) stat="ok" ;;
 126         1) stat="missing" ;;
 127         2) stat="too old" ;;
 128         *) stat="unable to check" ;;
 129     esac
 130
 131     echo $stat
 132
 133     if [ $retval -ne 0 ]; then
 134         missing="$missing $prog"
 135         eval ${prog}_why=\""$stat"\"
 136     fi
 137
 138 done
 139
 140
 141 if [ x"$missing" != x ]; then
 142
 143     cat <<EOF
 144
 145 Building Emacs from Bzr requires the following specialized programs:
 146 EOF
 147
 148     for prog in $progs; do
 149         eval min=\$${prog}_min
 150
 151         echo "$prog (minimum version $min)"
 152     done
 153
 154
 155     cat <<EOF
 156
 157 Your system seems to be missing the following tool(s):
 158 EOF
 159
 160     for prog in $missing; do
 161         eval why=\$${prog}_why
 162
 163         echo "$prog ($why)"
 164     done
 165
 166     cat <<EOF
 167
 168 If you think you have the required tools, please add them to your PATH
 169 and re-run this script.
 170
 171 Otherwise, please try installing them.
 172 On systems using rpm and yum, try: "yum install PACKAGE"
 173 On systems using dpkg and apt, try: "apt-get install PACKAGE"
 174 Then re-run this script.
 175
 176 If you do not have permission to do this, or if the version provided
 177 by your system is too old, it is normally straightforward to build
 178 these packages from source.  You can find the sources at:
 179
 180 ftp://ftp.gnu.org/gnu/PACKAGE/
 181
 182 Download the package (make sure you get at least the minimum version
 183 listed above), extract it using tar, then run configure, make,
 184 make install.  Add the installation directory to your PATH and re-run
 185 this script.
 186
 187 If you know that the required versions are in your PATH, but this
 188 script has made an error, then you can simply run
 189
 190 autoreconf -i -I m4
 191
 192 instead of this script.
 193
 194 If all else fails, you can try using the pre-built versions of the
 195 generated files by doing:
 196
 197 ./autogen/copy_autogen
 198
 199 This is not recommended - see the comments in \`copy_autogen'.
 200
 201 Please report any problems with this script to bug-gnu-emacs@gnu.org .
 202 EOF
 203
 204     exit 1
 205 fi
 206
 207 echo "Your system has the required tools, running autoreconf..."
 208
 209
 210 ## Let autoreconf figure out what, if anything, needs doing.
 211 autoreconf -i -I m4 || exit $?
 212
 213 ## Create a timestamp, so that './autogen.sh; make' doesn't
 214 ## cause 'make' to needlessly run 'autoheader'.
 215 echo timestamp > src/stamp-h.in || exit
 216
 217 echo "You can now run \`./configure'."
 218
 219 exit 0
 220
 221 ### autogen.sh ends here