#!/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

'

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__