#!/bin/sh

#
# Yoink
# Execute this file to link the executable with fewer direct dependencies.
#
# You shouldn't call this directly; instead, use the configure script's
# --enable-link-sh option and run make normally.  This isn't enabled by
# default because there is the potential for runtime linking problems.  If
# you have a newer version of GCC, you should prefer the --as-needed linker
# flag over this method, though they both should accomplish the same thing.
#

# link.sh -- try linking Vim with different sets of libraries, finding the
# minimal set for fastest startup.  The problem is that configure adds a few
# libraries when they exist, but this doesn't mean they are needed for Vim.
#
#      Author: Bram Moolenaar
# Last change: 2006 Sep 26
#     License: Public domain
#
# Warning: This fails miserably if the linker doesn't return an error code!
#
# Otherwise this script is fail-safe, falling back to the original full link
# command if anything fails.

echo "$LINK " >link.cmd
exit_value=0

#
# If .link/link.sed already exists, use it.  We assume a previous run of
# link.sh has found the correct set of libraries.
#
if test -f .link/link.sed; then
  echo "link.sh: The file '.link/link.sed' exists, which is going to be used now."
  echo "link.sh: If linking fails, try deleting the .link/link.sed file."
  echo "link.sh: If this fails too, try creating an empty .link/link.sed file."
else

# If linking works with the full link command, try removing some libraries,
# that are known not to be needed on at least one system.
# Remove .link/pathdef.c if there is a new link command and compile it again.
# There is a loop to remove libraries that appear several times.
#
# Notes:
# - Can't remove Xext; It links fine but will give an error when running gvim
#   with Motif.
# - Don't remove the last -lm: On HP-UX Vim links OK but crashes when the GTK
#   GUI is started, because the "floor" symbol could not be resolved.
#
  cat link.cmd
  if sh link.cmd; then
    mkdir -p .link
    touch .link/link.sed
    cp link.cmd linkit.sh
    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
      cont=yes
      while test -n "$cont"; do
        if grep "l$libname " linkit.sh >/dev/null; then
          if test ! -f link1.sed; then
            echo "link.sh: OK, linking works, let's try removing a few libraries."
            echo "link.sh: See .link/link.log for details."
            rm -f .link/link.log
          fi
          echo "s/-l$libname  *//" >link1.sed
          sed -f .link/link.sed <link.cmd >linkit2.sh
          sed -f link1.sed <linkit2.sh >linkit.sh
          # keep the last -lm
          if test $libname != "m" || grep "lm " linkit.sh >/dev/null; then
            echo "link.sh: Trying to remove the $libname library..."
            cat linkit.sh >>.link/link.log
            # Redirect this link output, it may contain error messages which
            # should be ignored.
            if sh linkit.sh >>.link/link.log 2>&1; then
              echo "link.sh: We don't need the $libname library!"
              cat link1.sed >>.link/link.sed
            else
              echo "link.sh: We DO need the $libname library."
              cont=
              cp link.cmd linkit.sh
            fi
          else
            cont=
            cp link.cmd linkit.sh
          fi
        else
          cont=
          cp link.cmd linkit.sh
        fi
      done
    done
    if test ! -f link1.sed; then
      echo "link.sh: Linked fine, no libraries can be removed"
      touch link3.sed
    fi
  else
    exit_value=$?
  fi
fi

#
# Now do the real linking.
#
if test -s .link/link.sed; then
  echo "link.sh: Using .link/link.sed file to remove a few libraries"
  sed -f .link/link.sed <link.cmd >linkit.sh
  cat linkit.sh
  if sh linkit.sh; then
    exit_value=0
    echo "link.sh: Linked fine with a few libraries removed"
  else
    exit_value=$?
    echo "link.sh: Linking failed, making .link/link.sed empty and trying again"
    mv -f .link/link.sed link2.sed
    touch .link/link.sed
  fi
fi
if test -f .link/link.sed -a ! -s .link/link.sed -a ! -f link3.sed; then
  echo "link.sh: Using unmodified link command"
  cat link.cmd
  if sh link.cmd; then
    exit_value=0
    echo "link.sh: Linked OK"
  else
    exit_value=$?
    if test -f link2.sed; then
      echo "link.sh: Linking doesn't work at all, removing .link/link.sed"
      rm -f .link/link.sed
    fi
  fi
fi

#
# cleanup
#
rm -f link.cmd linkit.sh link1.sed link2.sed link3.sed linkit2.sh

#
# return an error code if something went wrong
#
exit $exit_value