#!/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... :-/

 TOOLS_TO_CHECK='

 make/^GNU

 gcc

 awk/^GNU

 sed

 bison

 flex

 makeinfo

 automake

 libtool

 patch

 tar

 gzip

 bzip2

 readlink

 '

 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 foobar

 #          -> foobar must exist in PATH

 # Usage: has_or_abort foobar/string

 #          -> foobar must exist in PATH, and $(foobar --version) must contain 'string'

 has_or_abort() {

     tool=$(echo "${1}/" |cut -d / -f 1)

     regexp=$(echo "${1}/" |cut -d / -f 2)

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

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

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

         printf "not found!"

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

         echo

     else

         printf "${where}"

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

             str=$(${tool} --version 2>&1 |egrep "${regexp}" |head -n 1)

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

                 printf " failed: '${tool} --version' does not match regexp '${regexp}'."

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

             fi

         fi

         echo

     fi

     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 bash is present, and at least version 3.0

 printf "Checking '/bin/bash' is at least bash-3.0... "

 [ -x /bin/bash ] || do_error "bash 3.0 or above was not found in '/bin/bash'"

 bash_version=$(/bin/bash -c 'echo ${BASH_VERSION}')

 bash_major=$(/bin/bash -c 'echo ${BASH_VERSINFO[0]}')

 [ ${bash_major} -ge 3 ] || do_error "bash 3.0 or above is needed ('/bin/bash' is '${bash_version}')"

 echo "${bash_version}"

 # Check the existence of absolutely required tools

 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;')

 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__