src/scripts/Configure-Makefile

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