Dogcows Code - chaz/yoink/blob - link.sh

   1 #!/bin/sh
   2
   3 #
   4 # Yoink
   5 # Execute this file to link the executable with fewer direct dependencies.
   6 #
   7 # You shouldn't call this directly; instead, use the configure script's
   8 # --enable-link-sh option and run make normally.  This isn't enabled by
   9 # default because there is the potential for runtime linking problems.  If
  10 # you have a newer version of GCC, you should prefer the --as-needed linker
  11 # flag over this method, though they both should accomplish the same thing.
  12 #
  13
  14 # link.sh -- try linking Vim with different sets of libraries, finding the
  15 # minimal set for fastest startup.  The problem is that configure adds a few
  16 # libraries when they exist, but this doesn't mean they are needed for Vim.
  17 #
  18 #      Author: Bram Moolenaar
  19 # Last change: 2006 Sep 26
  20 #     License: Public domain
  21 #
  22 # Warning: This fails miserably if the linker doesn't return an error code!
  23 #
  24 # Otherwise this script is fail-safe, falling back to the original full link
  25 # command if anything fails.
  26
  27 echo "$LINK " >link.cmd
  28 exit_value=0
  29
  30 #
  31 # If .link/link.sed already exists, use it.  We assume a previous run of
  32 # link.sh has found the correct set of libraries.
  33 #
  34 if test -f .link/link.sed; then
  35   echo "link.sh: The file '.link/link.sed' exists, which is going to be used now."
  36   echo "link.sh: If linking fails, try deleting the .link/link.sed file."
  37   echo "link.sh: If this fails too, try creating an empty .link/link.sed file."
  38 else
  39
  40 # If linking works with the full link command, try removing some libraries,
  41 # that are known not to be needed on at least one system.
  42 # Remove .link/pathdef.c if there is a new link command and compile it again.
  43 # There is a loop to remove libraries that appear several times.
  44 #
  45 # Notes:
  46 # - Can't remove Xext; It links fine but will give an error when running gvim
  47 #   with Motif.
  48 # - Don't remove the last -lm: On HP-UX Vim links OK but crashes when the GTK
  49 #   GUI is started, because the "floor" symbol could not be resolved.
  50 #
  51   cat link.cmd
  52   if sh link.cmd; then
  53     mkdir -p .link
  54     touch .link/link.sed
  55     cp link.cmd linkit.sh
  56     for libname in atk-1.0 cairo fontconfig freetype gdk-x11-2.0 gio-2.0 glib-2.0 gmodule-2.0 ogg pango-1.0 pangocairo-1.0 pangoft2-1.0 vorbis; do
  57       cont=yes
  58       while test -n "$cont"; do
  59         if grep "l$libname " linkit.sh >/dev/null; then
  60           if test ! -f link1.sed; then
  61             echo "link.sh: OK, linking works, let's try removing a few libraries."
  62             echo "link.sh: See .link/link.log for details."
  63             rm -f .link/link.log
  64           fi
  65           echo "s/-l$libname  *//" >link1.sed
  66           sed -f .link/link.sed <link.cmd >linkit2.sh
  67           sed -f link1.sed <linkit2.sh >linkit.sh
  68           # keep the last -lm
  69           if test $libname != "m" || grep "lm " linkit.sh >/dev/null; then
  70             echo "link.sh: Trying to remove the $libname library..."
  71             cat linkit.sh >>.link/link.log
  72             # Redirect this link output, it may contain error messages which
  73             # should be ignored.
  74             if sh linkit.sh >>.link/link.log 2>&1; then
  75               echo "link.sh: We don't need the $libname library!"
  76               cat link1.sed >>.link/link.sed
  77             else
  78               echo "link.sh: We DO need the $libname library."
  79               cont=
  80               cp link.cmd linkit.sh
  81             fi
  82           else
  83             cont=
  84             cp link.cmd linkit.sh
  85           fi
  86         else
  87           cont=
  88           cp link.cmd linkit.sh
  89         fi
  90       done
  91     done
  92     if test ! -f link1.sed; then
  93       echo "link.sh: Linked fine, no libraries can be removed"
  94       touch link3.sed
  95     fi
  96   else
  97     exit_value=$?
  98   fi
  99 fi
 100
 101 #
 102 # Now do the real linking.
 103 #
 104 if test -s .link/link.sed; then
 105   echo "link.sh: Using .link/link.sed file to remove a few libraries"
 106   sed -f .link/link.sed <link.cmd >linkit.sh
 107   cat linkit.sh
 108   if sh linkit.sh; then
 109     exit_value=0
 110     echo "link.sh: Linked fine with a few libraries removed"
 111   else
 112     exit_value=$?
 113     echo "link.sh: Linking failed, making .link/link.sed empty and trying again"
 114     mv -f .link/link.sed link2.sed
 115     touch .link/link.sed
 116   fi
 117 fi
 118 if test -f .link/link.sed -a ! -s .link/link.sed -a ! -f link3.sed; then
 119   echo "link.sh: Using unmodified link command"
 120   cat link.cmd
 121   if sh link.cmd; then
 122     exit_value=0
 123     echo "link.sh: Linked OK"
 124   else
 125     exit_value=$?
 126     if test -f link2.sed; then
 127       echo "link.sh: Linking doesn't work at all, removing .link/link.sed"
 128       rm -f .link/link.sed
 129     fi
 130   fi
 131 fi
 132
 133 #
 134 # cleanup
 135 #
 136 rm -f link.cmd linkit.sh link1.sed link2.sed link3.sed linkit2.sh
 137
 138 #
 139 # return an error code if something went wrong
 140 #
 141 exit $exit_value
 142