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+#!/bin/sh 
+# Generates multilib.h.
+#   Copyright (C) 1994 Free Software Foundation, Inc.
+
+#This file is part of GNU CC.
+
+#GNU CC is free software; you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation; either version 2, or (at your option)
+#any later version.
+
+#GNU CC is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#GNU General Public License for more details.
+
+#You should have received a copy of the GNU General Public License
+#along with GNU CC; see the file COPYING.  If not, write to
+#the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+# This shell script produces a header file which the gcc driver
+# program uses to pick which library to use based on the machine
+# specific options that it is given.
+
+# The first argument is a list of sets of options.  The elements in
+# the list are separated by spaces.  Within an element, the options
+# are separated by slashes.  No leading dash is used on the options.
+# Each option in a set is mutually incompatible with all other options
+# in the set.
+
+# The optional second argument is a list of subdirectory names.  If
+# the second argument is non-empty, there must be as many elements in
+# the second argument as there are options in the first argument.  The
+# elements in the second list are separated by spaces.  If the second
+# argument is empty, the option names will be used as the directory
+# names.
+
+# The optional third argument is a list of options which are
+# identical.  The elements in the list are separated by spaces.  Each
+# element must be of the form OPTION=OPTION.  The first OPTION should
+# appear in the first argument, and the second should be a synonym for
+# it.
+
+# The output looks like
+#   #define MULTILIB_MATCHES "\
+#   SUBDIRECTORY OPTIONS;\
+#   ...
+#   "
+# The SUBDIRECTORY is the subdirectory to use.  The OPTIONS are
+# multiple options separated by spaces.  Each option may start with an
+# exclamation point.  gcc will consider each line in turn.  If none of
+# the options beginning with an exclamation point are present, and all
+# of the other options are present, that subdirectory will be used.
+# The order of the subdirectories is such that they can be created in
+# order; that is, a subdirectory is preceded by all its parents.
+
+# Here is a example (this is simplified from the actual 680x0 case):
+#   genmultilib "m68000/m68020 msoft-float" "m68000 m68020 msoft-float"
+#		"m68000=mc68000"
+# This produces:
+#   #define MULTILIB_MATCHES "\
+#   m68000/msoft-float m68000 msoft-float;\
+#   m68000/msoft-float mc68000 msoft-float;\
+#   m68020/msoft-float m68020 msoft-float;\
+#   msoft-float !m68000 !mc68000 !m68020 msoft-float;\
+#   m68000 m68000 !msoft-float;\
+#   m68000 mc60000 !msoft-float;\
+#   m68020 m68020 !msoft-float;\
+#   . !m68000 !mc68000 !m68020 !msoft-float;\
+#   "
+# The effect is that `gcc -msoft-float' (for example) will append
+# msoft-float to the directory name when searching for libraries or
+# startup files, and `gcc -m68000 -msoft-float' (for example) will
+# append m68000/msoft-float.
+
+# Copy the positional parameters into variables.
+options=$1
+dirnames=$2
+matches=$3
+
+# What we want to do is select all combinations of the sets in
+# options.  Each combination which includes a set of mutually
+# exclusive options must then be output multiple times, once for each
+# item in the set.  Selecting combinations is a recursive process.
+# Since not all versions of sh support functions, we achieve recursion
+# by creating a temporary shell script which invokes itself.
+rm -f tmpmultilib
+cat >tmpmultilib <<\EOF
+#!/bin/sh
+# This recursive script basically outputs all combinations of its
+# input arguments, handling mutually exclusive sets of options by
+# repetition.  When the script is called, ${initial} is the list of
+# options which should appear before all combinations this will
+# output.  The output looks like a list of subdirectory names with
+# leading and trailing slashes.
+if [ "$#" != "0" ]; then
+  first=$1
+  shift
+  for opt in `echo $first | sed -e 's|/| |'g`; do
+    echo ${initial}${opt}/
+  done
+  ./tmpmultilib $@
+  for opt in `echo $first | sed -e 's|/| |'g`; do
+    initial="${initial}${opt}/" ./tmpmultilib $@
+  done
+fi
+EOF
+chmod +x tmpmultilib
+
+combinations=`initial=/ ./tmpmultilib ${options}`
+
+rm -f tmpmultilib
+
+# Construct a sed pattern which will convert option names to directory
+# names.
+todirnames=
+if [ -n "${dirnames}" ]; then
+  set x ${dirnames}
+  shift
+  for set in ${options}; do
+    for opt in `echo ${set} | sed -e 's|/| |'g`; do
+      if [ "$1" != "${opt}" ]; then
+        todirnames="${todirnames} -e s|/${opt}/|/${1}/|g"
+      fi
+      shift
+    done
+  done
+fi
+
+# Construct a sed pattern which will add negations based on the
+# matches.  The semicolons are easier than getting the shell to accept
+# quoted spaces when expanding a variable.
+matchnegations=
+for i in ${matches}; do
+  l=`echo $i | sed -e 's/=.*$//'`
+  r=`echo $i | sed -e 's/^.*=//'`
+  matchnegations="${matchnegations} -e s/;!${l};/;!${l};!${r};/"
+done
+
+# We need another recursive shell script to correctly handle positive
+# matches.  If we are invoked as
+#   genmultilib "opt1 opt2" "" "opt1=nopt1 opt2=nopt2"
+# we must output
+#   opt1/opt2 opt1 opt2
+#   opt1/opt2 nopt1 opt2
+#   opt1/opt2 opt1 nopt2
+#   opt1/opt2 nopt1 nopt2
+# In other words, we must output all combinations of matches.
+rm -f tmpmultilib2
+cat >tmpmultilib2 <<\EOF
+#!/bin/sh
+# The positional parameters are a list of matches to consider.
+# ${dirout} is the directory name and ${optout} is the current list of
+# options.
+if [ "$#" = "0" ]; then
+  echo "${dirout} ${optout};\\"
+else
+  first=$1
+  shift
+  dirout="${dirout}" optout="${optout}" ./tmpmultilib2 $@
+  l=`echo ${first} | sed -e 's/=.*$//'`
+  r=`echo ${first} | sed -e 's/^.*=//'`
+  case " ${optout} " in
+  *" ${l} "*)
+    newopt=`echo " ${optout} " | sed -e "s/ ${l} / ${r} /" -e 's/^ //' -e 's/ $//'`
+    dirout="${dirout}" optout="${newopt}" ./tmpmultilib2 $@
+    ;;
+  esac
+fi
+EOF
+chmod +x tmpmultilib2
+
+# We are ready to start output.
+echo '#define MULTILIB_SELECT "\'
+
+# Start with the current directory, which includes only negations.
+optout=
+for set in ${options}; do
+  for opt in `echo ${set} | sed -e 's|/| |'g`; do
+    optout="${optout} !${opt}"
+  done
+done
+optout=`echo ${optout} | sed -e 's/^ //'`
+if [ -n "${matchnegations}" ]; then
+  optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
+fi
+echo ". ${optout};\\"
+
+# Work over the list of combinations.  We have to translate each one
+# to use the directory names rather than the option names, we have to
+# include the information in matches, and we have to generate the
+# correct list of options and negations.
+for combo in ${combinations}; do
+  # Use the directory names rather than the option names.
+  if [ -n "${todirnames}" ]; then
+    dirout=`echo ${combo} | sed ${todirnames}`
+  else
+    dirout=${combo}
+  fi
+  # Remove the leading and trailing slashes.
+  dirout=`echo ${dirout} | sed -e 's|^/||' -e 's|/$||g'`
+
+  # Look through the options.  We must output each option that is
+  # present, and negate each option that is not present.  If an
+  # element of a set is present, we need not negate the other elements
+  # of the set.
+  optout=
+  for set in ${options}; do
+    setopts=`echo ${set} | sed -e 's|/| |g'`
+    found=
+    for opt in ${setopts}; do
+      case "${combo}" in
+      *"/${opt}/"*)
+	optout="${optout} ${opt}"
+	found=yes
+	;;
+      esac
+    done
+    if [ "${found}" = "" ]; then
+      for opt in ${setopts}; do
+	optout="${optout} !${opt}"
+      done
+    fi
+  done
+  optout=`echo ${optout} | sed -e 's/^ //'`
+
+  # Add any negations of matches.
+  if [ -n "${matchnegations}" ]; then
+    optout=`echo ";${optout};" | sed -e 's/ /;/g' ${matchnegations} -e 's/^;//' -e 's/;$//' -e 's/;/ /g'`
+  fi
+
+  # Output the line with all appropriate matches.
+  dirout="${dirout}" optout="${optout}" ./tmpmultilib2 ${matches}
+done
+
+rm -f tmpmultilib2
+
+# That's it.
+echo '"'
+
+exit 0