src/link.sh

   1 #! /bin/sh
   2 #
   3 # link.sh -- try linking Vim with different sets of libraries, finding the
   4 # minimal set for fastest startup.  The problem is that configure adds a few
   5 # libraries when they exist, but this doesn't mean they are needed for Vim.
   6 #
   7 #      Author: Bram Moolenaar
   8 # Last change: 2006 Sep 26
   9 #     License: Public domain
  10 #
  11 # Warning: This fails miserably if the linker doesn't return an error code!
  12 #
  13 # Otherwise this script is fail-safe, falling back to the original full link
  14 # command if anything fails.
  15
  16 echo "$LINK " >link.cmd
  17 exit_value=0
  18
  19 #
  20 # If auto/link.sed already exists, use it.  We assume a previous run of
  21 # link.sh has found the correct set of libraries.
  22 #
  23 if test -f auto/link.sed; then
  24   echo "link.sh: The file 'auto/link.sed' exists, which is going to be used now."
  25   echo "link.sh: If linking fails, try deleting the auto/link.sed file."
  26   echo "link.sh: If this fails too, try creating an empty auto/link.sed file."
  27 else
  28
  29 # If linking works with the full link command, try removing some libraries,
  30 # that are known not to be needed on at least one system.
  31 # Remove auto/pathdef.c if there is a new link command and compile it again.
  32 # There is a loop to remove libraries that appear several times.
  33 #
  34 # Notes:
  35 # - Can't remove Xext; It links fine but will give an error when running gvim
  36 #   with Motif.
  37 # - Don't remove the last -lm: On HP-UX Vim links OK but crashes when the GTK
  38 #   GUI is started, because the "floor" symbol could not be resolved.
  39 #
  40   cat link.cmd
  41   if sh link.cmd; then
  42     touch auto/link.sed
  43     cp link.cmd linkit.sh
  44     for libname in SM ICE nsl dnet dnet_stub inet socket dir elf iconv Xt Xmu Xp Xpm X11 Xdmcp x w dl pthread thread readline m perl crypt attr; do
  45       cont=yes
  46       while test -n "$cont"; do
  47         if grep "l$libname " linkit.sh >/dev/null; then
  48           if test ! -f link1.sed; then
  49             echo "link.sh: OK, linking works, let's try removing a few libraries."
  50             echo "link.sh: See auto/link.log for details."
  51             rm -f auto/link.log
  52           fi
  53           echo "s/-l$libname  *//" >link1.sed
  54           sed -f auto/link.sed <link.cmd >linkit2.sh
  55           sed -f link1.sed <linkit2.sh >linkit.sh
  56           # keep the last -lm
  57           if test $libname != "m" || grep "lm " linkit.sh >/dev/null; then
  58             echo "link.sh: Trying to remove the $libname library..."
  59             cat linkit.sh >>auto/link.log
  60             # Redirect this link output, it may contain error messages which
  61             # should be ignored.
  62             if sh linkit.sh >>auto/link.log 2>&1; then
  63               echo "link.sh: We don't need the $libname library!"
  64               cat link1.sed >>auto/link.sed
  65               rm -f auto/pathdef.c
  66             else
  67               echo "link.sh: We DO need the $libname library."
  68               cont=
  69               cp link.cmd linkit.sh
  70             fi
  71           else
  72             cont=
  73             cp link.cmd linkit.sh
  74           fi
  75         else
  76           cont=
  77           cp link.cmd linkit.sh
  78         fi
  79       done
  80     done
  81     if test ! -f auto/pathdef.c; then
  82       $MAKE objects/pathdef.o
  83     fi
  84     if test ! -f link1.sed; then
  85       echo "link.sh: Linked fine, no libraries can be removed"
  86       touch link3.sed
  87     fi
  88   else
  89     exit_value=$?
  90   fi
  91 fi
  92
  93 #
  94 # Now do the real linking.
  95 #
  96 if test -s auto/link.sed; then
  97   echo "link.sh: Using auto/link.sed file to remove a few libraries"
  98   sed -f auto/link.sed <link.cmd >linkit.sh
  99   cat linkit.sh
 100   if sh linkit.sh; then
 101     exit_value=0
 102     echo "link.sh: Linked fine with a few libraries removed"
 103   else
 104     exit_value=$?
 105     echo "link.sh: Linking failed, making auto/link.sed empty and trying again"
 106     mv -f auto/link.sed link2.sed
 107     touch auto/link.sed
 108     rm -f auto/pathdef.c
 109     $MAKE objects/pathdef.o
 110   fi
 111 fi
 112 if test -f auto/link.sed -a ! -s auto/link.sed -a ! -f link3.sed; then
 113   echo "link.sh: Using unmodified link command"
 114   cat link.cmd
 115   if sh link.cmd; then
 116     exit_value=0
 117     echo "link.sh: Linked OK"
 118   else
 119     exit_value=$?
 120     if test -f link2.sed; then
 121       echo "link.sh: Linking doesn't work at all, removing auto/link.sed"
 122       rm -f auto/link.sed
 123     fi
 124   fi
 125 fi
 126
 127 #
 128 # cleanup
 129 #
 130 rm -f link.cmd linkit.sh link1.sed link2.sed link3.sed linkit2.sh
 131
 132 #
 133 # return an error code if something went wrong
 134 #
 135 exit $exit_value
 136
 137 # vim:set sw=2 et: