#!/bin/sh

 VERSION=$(cat .version)

 DATE=$(date +%Y%m%d)

 # All absolutely required tools, one per line to ease diff.

 # See function 'has_or_abort, below, for syntax

 #  - Hopefully, if gcc is present, then all associated tools will be

 #  - awk must be GNU awk

 #  - makeinfo for building docs, even if discarded later on

 #  - others obvious... :-/

 #

 # Format of a pattern to check for, one per line:

 #   pattern := tool_test  OR  pattern|tool_test

 #   tool_test := tool/regexp

 #   tool := name of the tool  OR  absolute pathname to the tool

 #   regexp := valid grep(1) extended regular expression  OR  empty

 #

 # In case a pattern list is given (eg foo|bar|buz), then tests are performed

 # from left to right, stopping at the first matching test (like the shell

 # would parse 'foo || bar || buz' ).

 #

 # Examples:

 #    /bin/bash/^GNU bash, version 3\.

 #       will ensure that /bin/bash exists, and that $(/bin/bash --version)

 #       matches the regexp '^GNU bash, version 3\.'

 #    autoconf/(GNU Autoconf)|autoconf2.50/

 #       will ensure that:

 #         - 'autoconf' is to be found in the PATH, and that $(autoconf

 #           --version) matches the regexp '(GNU Autoconf)' (which btw is

 #           the signature of autoconf >= 2.50),

 #       OR that:

 #         - 'autoconf2.50' is to be found in the PATH

 #

 TOOLS_TO_CHECK='

 /bin/bash/^GNU bash, version 3\.

 make/^GNU Make

 gcc/

 gawk/^GNU Awk

 sed/

 bison/

 flex/

 makeinfo/

 automake/

 libtool/

 patch/

 tar/

 gzip/

 bzip2/

 '

 PREFIX_DEFAULT=/usr/local

 BINDIR_set=

 LIBDIR_set=

 DOCDIR_set=

 MANDIR_set=

 LOCAL_set=

 FORCE=0

 do_quit=

 CONTRIB_list=

 # Simply print the error message, and exit. Obvious, he?

 do_error() {

     echo "${@}"

     exit 1

 }

 # A small function to test for existence of various tools

 # Usage: has_or_abort test_pattern (see top of file, TOOLS_TO_CHECK, for

 #                                   complete pattern format)

 has_or_abort() {

     { IFS="|"; for item in ${1}; do

           tool="${item%/*}"

           regexp="${item##*/}"

           printf "Checking for '${tool}'... "

           where=$(which "${tool}" 2>/dev/null || true)

           if [ -z "${where}" ]; then

               echo "not found"

               where=

               continue

           else

               if [ -n "${regexp}" ]; then

                   tool_version=$(${tool} --version 2>&1)

                   str=$(echo "${tool_version}" |grep -E "${regexp}" |head -n 1)

                   if [ -z "${str}" ]; then

                       echo "wrong version string: expecting regexp '${regexp}'"

                       where=""

                       continue

                   fi

               fi

               echo "${where}"

               return 0

           fi

       done;

     }

     [ ${FORCE} -eq 0 ] && do_error "Bailing out..."

     return 0

 }

 # Given an option string and the following argument,

 # echoes the value of the option.

 # If --var=val => echoes val and returns 0, meaning second arg was not consumed

 # If --var val => echoes val and returns non null, meaning second arg was used

 get_optval(){

     local ret

     case "$1" in

         --*=?*)

             echo "${1}" |cut -d '=' -f 2-

             ret=0

             ;;

         *)

             echo "${2}"

             ret=1

             ;;

     esac

     return ${ret}

 }

 # The set_xxx functions will set the corresponding configuration variable

 # They return 0 if second arg was not consumed, and non-zero if it was consumed.

 set_prefix() {

     PREFIX=$(get_optval "$1" "$2")

     return $?

 }

 set_bindir() {

     BINDIR_set=1

     BINDIR=$(get_optval "$1" "$2")

     return $?

 }

 set_libdir() {

     LIBDIR_set=1

     LIBDIR=$(get_optval "$1" "$2")

     return $?

 }

 set_docdir() {

     DOCDIR_set=1

     DOCDIR=$(get_optval "$1" "$2")

     return $?

 }

 set_mandir() {

     MANDIR_set=1

     MANDIR=$(get_optval "$1" "$2")

     return $?

 }

 # The set_contrib function is different in that it will work like the others,

 # except in two cases:

 # If all => replaces all with the list of all available contribs

 # If list => just echoes the list of all available contribs, and instructs

 # caller to quit immediately by setting do_quit to non null.

 # (can't use the return code, see above).

 set_contrib() {

     opt_val=$(get_optval "$1" "$2")

     local ret=$?

     case "${opt_val}" in

         all)

             CONTRIB_list=$(LC_ALL=C ls -1 contrib/*.patch.lzma  \

                            |xargs -I {} basename {} .patch.lzma \

                            |sed -r -e ':a; /$/N; s/\n/,/; ta;'

                           )

             ;;

         list)

             do_quit=1

             echo "Available contributions:"

             LC_ALL=C ls -1 contrib/*.patch.lzma     \

             |xargs -I {} basename {} .patch.lzma    \

             |sed -r -e 's/^/  /;'

             ;;

         *)  CONTRIB_list="${CONTRIB_list},${opt_val}";;

     esac

     return $ret

 }

 do_help() {

     cat <<__EOF__

 \`configure' configures crosstool-NG ${VERSION} to adapt to many kind of systems.

 USAGE: ./configure [OPTION]...

 Defaults for the options are specified in brackets.

 Configuration:

   -h, --help              display this help and exit                                                                                                                  

       --force             force ./configure to complete, even if one or more

                           tools were not found. Use at your own risk, only if

                           you know what you are doing!

 Installation directories:

   --prefix=PREFIX         install files in PREFIX [${PREFIX_DEFAULT}]

   --local                 don't install, and use current directory

 By default, \`make install' will install all the files in

 \`${PREFIX_DEFAULT}/bin', \`${PREFIX_DEFAULT}/lib' etc.  You can specify

 an installation prefix other than \`${PREFIX_DEFAULT}' using \`--prefix',

 for instance \`--prefix=\${HOME}'.

 For better control, use the options below.

 Fine tuning of the installation directories:

   --bindir=DIR            user executables [PREFIX/bin]

   --libdir=DIR            object code libraries [PREFIX/lib]

   --docdir=DIR            info documentation [PREFIX/share/doc]

   --mandir=DIR            man documentation [PREFIX/share/man]

 Optional Features:

   --with-contrib=XXX      Include externally contributed features found in the

                           contrib/ sub-directory. Set to a comma-separated list

                           of features. Use 'all' to use all contributions, and

                           'list' to see which are available.

 __EOF__

 }

 #---------------------------------------------------------------------

 # Set user's options

 while [ $# -ne 0 ]; do

     case "$1" in

         --prefix*)  set_prefix "$1" "$2" && shift || shift 2;;

         --bindir*)  set_bindir "$1" "$2" && shift || shift 2;;

         --libdir*)  set_libdir "$1" "$2" && shift || shift 2;;

         --docdir*)  set_docdir "$1" "$2" && shift || shift 2;;

         --mandir*)  set_mandir "$1" "$2" && shift || shift 2;;

         --local)    LOCAL_set=1; shift;;

         --force)    FORCE=1; shift;;

         --with-contrib*)

                     set_contrib "$1" "$2" && shift || shift 2

                     [ "${do_quit}" = "1" ] && exit 0

                     ;;

         --help|-h)  do_help; exit 0;;

         *)          do_help; exit 1;;

     esac

 done

 # Use defaults

 [ -z "${PREFIX}" ] && set_prefix "" "${PREFIX_DEFAULT}"

 # Special case when installing locally

 if [ "${LOCAL_set}" = "1" ]; then

     set_prefix "" $(pwd)

     set_bindir "" $(pwd)

     set_libdir "" $(pwd)

     set_docdir "" $(pwd)/docs

     set_mandir "" $(pwd)/docs

 fi

 #---------------------------------------------------------------------

 # Some sanity checks, now

 # If this version is a svn snapshot, try to get the revision number

 # If we can't get the revision number, use date

 printf "Computing version string... "

 case "${VERSION}" in

   *+svn)

     REVISION=$(LC_ALL=C svnversion)

     case "${REVISION}" in

       exported)

         VERSION="${VERSION}unknown@$(date +%Y%m%d.%H%M%S)";;

       *)

         URL=$(LC_ALL=C svn info 2>/dev/null |egrep 'URL: ' |cut -d ' ' -f 2-)

         ROOT=$(LC_ALL=C svn info 2>/dev/null |egrep 'Repository Root: ' |cut -d ' ' -f 3-)

         VERSION="${VERSION}${URL#${ROOT}}@${REVISION}"

         ;;

     esac

     # Arrange to have no / in the directory name, no need to create an

     # arbitrarily deep directory structure

     VERSION=$(echo "${VERSION}" |sed -r -e 's|/+|_|g;')

     ;;

 esac

 echo "${VERSION}"

 # Now we have the version string, we can build up the paths

 [ -z "${BINDIR_set}" ] && BINDIR="${PREFIX}/bin"

 [ -z "${LIBDIR_set}" ] && LIBDIR="${PREFIX}/lib/ct-ng-${VERSION}"

 [ -z "${DOCDIR_set}" ] && DOCDIR="${PREFIX}/share/doc/ct-ng-${VERSION}"

 [ -z "${MANDIR_set}" ] && MANDIR="${PREFIX}/share/man/man1"

 # Check that install PATHs are absolute

 for p in BIN LIB DOC MAN; do

   var="${p}DIR"

   eval v="\${${var}}"

   case "${v}" in

     /*) ;;

     *)  do_error "'${var}' is not an absolute path: '${v}'"

   esac

 done

 # Check the existence of absolutely required tools

 { IFS='

 ';

   for tool in ${TOOLS_TO_CHECK}; do

       has_or_abort "${tool}"

   done;

 }

 # It's safer to change all ',' to spaces rather than setting IFS

 CONTRIB_list=$(echo "${CONTRIB_list}" |sed -r -e 's/,+/ /g; s/ +/ /g; s/^ //g; s/ $//g;')

 if [ -n "${CONTRIB_list}" ]; then

     has_or_abort 'lzcat/'

     printf "Applying contributed code: "

     for c in ${CONTRIB_list}; do

         printf "${c}, "

         if [ ! -f "contrib/${c}.patch.lzma" ]; then

             do_error "Contribution '${c}' does not exist"

         fi

         lzcat "contrib/${c}.patch.lzma" |patch -p1 >/dev/null 2>&1

     done

     echo "done"

 fi

 printf "Building up Makefile... "

 sed -r -e "s,@@BINDIR@@,${BINDIR},g;"   \

        -e "s,@@LIBDIR@@,${LIBDIR},g;"   \

        -e "s,@@DOCDIR@@,${DOCDIR},g;"   \

        -e "s,@@MANDIR@@,${MANDIR},g;"   \

        -e "s,@@VERSION@@,${VERSION},g;" \

        -e "s,@@DATE@@,${DATE},g;"       \

        -e "s,@@LOCAL@@,${LOCAL_set},g;" \

        Makefile.in >Makefile

 echo "done"

 cat <<__EOF__

 crosstool-NG configured as follows:

   PREFIX='${PREFIX}'

   BINDIR='${BINDIR}'

   LIBDIR='${LIBDIR}'

   DOCDIR='${DOCDIR}'

   MANDIR='${MANDIR}'

   CONTRIB='${CONTRIB_list}'

 __EOF__