src/scripts/Configure-Makefile

   1 #! /bin/sh
   2 # $Cambridge: exim/src/scripts/Configure-Makefile,v 1.3 2009/11/20 21:22:20 nm4 Exp $
   3
   4 # Shell script to build Makefile in a build directory. It must be called
   5 # from inside the directory. It does its own checking of when to rebuild; it
   6 # just got too horrendous to get it right in "make", because of the optionally
   7 # existing configuration files.
   8
   9
  10 # First off, get the OS type, and check that there is a make file for it.
  11
  12 ostype=`../scripts/os-type -generic` || exit 1
  13
  14 if [ ! -r ../OS/Makefile-$ostype ] ; then
  15   echo ""
  16   echo "*** Sorry - operating system $ostype is not supported"
  17   echo "*** See OS/Makefile-* for supported systems" 1>&2
  18   echo ""
  19   exit 1
  20 fi
  21
  22 # We also need the architecture type, in order to test for any architecture-
  23 # specific configuration files.
  24
  25 archtype=`../scripts/arch-type` || exit 1
  26
  27 # Now test for either the non-existence of Makefile, or for any of its
  28 # components being newer. Note that the "newer" script gives the right
  29 # answer (for our purposes) when the first file is non-existent.
  30
  31 editme=../Local/Makefile
  32 rebuild=yes
  33
  34 if [ -f Makefile ] ; then
  35   rebuild=no
  36   if ../scripts/newer $editme Makefile || \
  37      ../scripts/newer $editme-$ostype Makefile || \
  38      ../scripts/newer $editme-$archtype Makefile || \
  39      ../scripts/newer $editme-$ostype-$archtype Makefile || \
  40      ../scripts/newer ../scripts/Configure-Makefile Makefile || \
  41      ../scripts/newer ../OS/Makefile-Base Makefile || \
  42      ../scripts/newer ../OS/Makefile-Default Makefile
  43   then
  44     rebuild=yes
  45   fi
  46 fi
  47
  48 # If the "build" variable is set it means that a build name was explicitly
  49 # given. Arrange to pick up a build-specific configuration file.
  50
  51 if [ "X$build" != "X" ] ; then
  52   mfb=Local/Makefile-$build
  53   if ../scripts/newer $editme-$build Makefile ; then
  54     rebuild=yes
  55   fi
  56 else
  57   mfb=
  58 fi
  59
  60
  61 # If Makefile is up-to-date, no need to rebuild it.
  62
  63 if [ $rebuild = no ] ; then
  64   echo "\`Makefile' is up to date."
  65   echo " "
  66   exit
  67 fi
  68
  69 # Makefile needs to be rebuilt in the current directory by joining
  70 # the generic default makefile, the OS base makefile, and then local
  71 # generic, OS-specific, architecture-specific, and OS+architecture-specific
  72 # makefiles, if they exist. These files all contain macro definitions, with
  73 # later definitions overriding earlier ones. Make a temporary file first, in
  74 # case things go wrong. A second temporary is needed for sorting out the
  75 # default Perl stuff. Use short macro names to save typing.
  76
  77 mf=Makefile
  78 mft=$mf-t
  79 mftt=$mf-tt
  80
  81 look_mf=lookups/Makefile.predynamic
  82 look_mft=${look_mf}-t
  83
  84 # Ensure the temporary does not exist and start the new one by setting
  85 # the OSTYPE and ARCHTYPE variables.
  86
  87 rm -f $mft $mftt $look_mf-t
  88 (echo "OSTYPE=$ostype"; echo "ARCHTYPE=$archtype"; echo "") > $mft || exit 1
  89
  90 # Now concatenate the files to the temporary file. Copy the files using sed to
  91 # remove comments, blank lines, and trailing white space.
  92
  93 # BEWARE: a tab character is needed in the sed command below. It has had
  94 # a nasty tendency to get lost in the past, causing a problem if a tab has
  95 # actually been present in one of the files. Use a variable to hold a space
  96 # and a tab to keep the tab in one place.
  97
  98 st='     '
  99
 100 for f in OS/Makefile-Default \
 101          OS/Makefile-$ostype \
 102          Local/Makefile \
 103          Local/Makefile-$ostype \
 104          Local/Makefile-$archtype \
 105          Local/Makefile-$ostype-$archtype \
 106          $mfb
 107 do   if test -r ../$f
 108      then   echo "# From $f"
 109             sed "/^#/d;/^[$st]*\$/d;s/[$st]*\$//" ../$f || exit 1
 110             echo "# End of $f"
 111             echo ""
 112      fi
 113 done >> $mft || exit 1
 114
 115 # make the lookups Makefile with the definitions
 116
 117 ## prepend stuff here; eg: grep LOOKUP_ $mft > $look_mft
 118 ## cat ../src/lookups/Makefile >> $look_mft
 119 cp ../src/lookups/Makefile $look_mft
 120
 121 # See if there is a definition of EXIM_PERL in what we have built so far.
 122 # If so, run Perl to find the default values for PERL_CC, PERL_CCOPTS,
 123 # and PERL_LIBS. These need to be put at the top of the Makefile, so we rename
 124 # what we have so far and then copy it afterwards. Use the value of PERL_COMMAND
 125 # if it has been defined.
 126
 127 EXIM_PERL=`grep EXIM_PERL $mft`
 128
 129 PERL_COMMAND=`grep PERL_COMMAND $mft | sed -e "\\$!d;s/^[$st]*PERL_COMMAND[$st]*=[$st]*//"`
 130 if [ "${PERL_COMMAND}" = "" ] ; then
 131   PERL_COMMAND='perl'
 132 fi
 133
 134 if [ "${EXIM_PERL}" != "" ] ; then
 135   testperl=`$PERL_COMMAND --version`
 136   if [ "$testperl" = "" ] ; then
 137     echo "*** EXIM_PERL is set, but '$PERL_COMMAND --version' failed"
 138     exit 1
 139   fi
 140
 141   EXTUTILS_EMBED_NOT_INSTALLED=`$PERL_COMMAND -MExtUtils::Embed -e ";" 2>&1`
 142   if [ "${EXTUTILS_EMBED_NOT_INSTALLED}" != "" ] ; then
 143     echo "Please install ExtUtils::Embed for $PERL_COMMAND"
 144     exit 1;
 145   fi
 146
 147   mv $mft $mftt
 148   echo "PERL_CC=`$PERL_COMMAND -MConfig -e 'print $Config{cc}'`" >>$mft
 149   echo "PERL_CCOPTS=`$PERL_COMMAND -MExtUtils::Embed -e ccopts`" >>$mft
 150   echo "PERL_LIBS=`$PERL_COMMAND -MExtUtils::Embed -e ldopts`" >>$mft
 151   echo "" >>$mft
 152   cat $mftt >> $mft
 153   rm -f $mftt
 154 fi
 155
 156 # Record the build variable in the Makefile.
 157
 158 echo "build=$build" >>$mft
 159 echo "" >>$mft
 160
 161 # Finally, join on the generic base make file, which contains the actual
 162 # rules and stuff.
 163
 164 echo "# From ../OS/Makefile-Base" >> $mft
 165 cat ../OS/Makefile-Base >> $mft || exit 1
 166
 167 # If the new makefile is the same as the existing one, say so, and just
 168 # update the timestamp. Otherwise remove the old and install the new.
 169
 170 if      [ -s $mf ] && cmp -s $mft $mf && [ -s $look_mf ] && cmp -s $look_mft $look_mf
 171 then    echo ">>> rebuilt $mf unchanged"
 172         echo " "
 173         touch $mf || exit
 174         rm -f $mft
 175 elif    rm -f $mf $look_mf
 176         mv $mft $mf
 177         mv $look_mft $look_mf
 178 then    echo ">>> New $mf & $look_mf installed"
 179         echo '>>> Use "make makefile" if you need to force rebuilding of the makefile'
 180         echo " "
 181 else    echo " "
 182         echo "*** Failed to install $mf - see $mft"
 183         echo "    (or $look_mft)"
 184         echo " "
 185         exit 1;
 186 fi
 187
 188 # End of Configure-Makefile