#!/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

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

#  - others obvious... :-/

#

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

#   pattern := var_name : tool_pattern  OR  tool_pattern

#   tool_pattern := tool_test  OR  tool_pattern || tool_test

#   tool_test := tool=regexp OR tool

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

#   regexp := valid grep(1) extended regular expression, $( tool --version)

#             will be matched against this regexp.

#

# 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:

#    bash:bash=^GNU bash, version 3\.

#     - if ${bash} is set and non-null, does nothing

#     - else ensures that bash exists in the PATH, and that $( bash --version )

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

#       - if so, then sets bash="$( which bash )"

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

#     - does not look at an existing variable

#     - ensures 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='

bash:bash=^GNU bash, version [34]\.

cut

xargs

install:install=GNU coreutils

make:make=^GNU Make

gcc

awk

bison

flex

makeinfo

automake=\(GNU automake\) (1\.[[:digit:]]{2,}\.|[2-9][[:digit:]]*\.)

libtool=\(GNU libtool.*\) (2[[:digit:]]*\.|1\.6[[:digit:]]*\.|1\.5\.[2-9][[:digit:]]+)

curl || wget

patch

tar

gzip

bzip2

'

PREFIX_DEFAULT=/usr/local

BINDIR_set=

LIBDIR_set=

DOCDIR_set=

MANDIR_set=

LOCAL_set=

do_quit=

# 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() {

    local save_IFS

    local var_name

    local var_value

    local tool_pattern

    local field

    var_name="$( echo "${1}" |"${sed}" -r -e 's/^(([^=:]+):.+|[^:=]+=.+|[^:=]+)$/\2/;' )"

    field="${var_name:+2}"

    field="${field:-1}"

    tool_pattern="$( echo "${1}" |cut -d : -f ${field}- |"${sed}" -r -e 's/ *\|\| */\n/g;' )"

    save_IFS="${IFS}"

    # Set IFS to \n only

    IFS='

'

    for item in ${tool_pattern}; do

        case "${item}" in

            *=*)

                tool="${item%%=*}"

                regexp="${item#*=}"

                ;;

            *)  tool="${item}"

                regexp=

                ;;

        esac

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

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

            eval var_value='"${'"${var_name}"'}"'

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

                echo "${var_value} (cached)"

                return 0

            fi

        fi

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

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

            echo "not found"

            where=

            continue

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

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

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

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

                echo "not found"

                where=""

                continue

            fi

        fi

        break

    done

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

        for item in ${tool_pattern}; do

            case "${item}" in

                *=*)

                    tool="${item%%=*}"

                    regexp="${item#*=}"

                    ;;

                *)  tool="${item}"

                    regexp=

                    ;;

            esac

            printf "  could not find '${tool}'"

            [ -n "${regexp}" ] && printf " matching regexp '${regexp}'"

            echo

        done

        echo "Either you are missing entirely the needed tool,"

        echo "or the version you have is too old."

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

            echo "You can give the path to this tool using: --with-${var_name}=PATH"

        fi

        # FORCE can be set in the environment

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

    else

        echo "${where}"

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

            eval ${var_name}='"'"${where}"'"'

        fi

    fi

    IFS="${save_IFS}"

    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(){

    case "$1" in

        --*=?*)

            echo "${1#*=}"

            return 0

            ;;

        *)

            echo "${2}"

            return 1

            ;;

    esac

}

# 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" )"

}

set_bindir() {

    BINDIR_set=1

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

}

set_libdir() {

    LIBDIR_set=1

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

}

set_docdir() {

    DOCDIR_set=1

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

}

set_mandir() {

    MANDIR_set=1

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

}

set_tool() {

    local var_name="${1%%=*}"

    var_name="${var_name#--with-}"

    eval ${var_name}="\$( get_optval "$1" "$2" )"

}

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

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-install=PATH     Specify the full PATH to GNU install

  --with-make=PATH        Specify the full PATH to GNU make

  --with-grep=PATH        Specify the full PATH to GNU grep

  --with-sed=PATH         Specify the full PATH to GNU sed

  --with-bash=PATH        Specify the full PATH to bash >= 3.0

__EOF__

}

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

# Set user's options

while [ $# -ne 0 ]; do

    case "$1" in

        --local)    LOCAL_set="y"; shift;;

        --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;;

        --with-*)   set_tool   "$1" "$2" && shift || shift 2;;

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

        *)          echo "Unrecognised option: '${1}'"; do_help; exit 1;;

    esac

done

# Use defaults

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

# Special case when installing locally

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

    set_prefix "" "$( pwd )"

    set_bindir "" "$( pwd )"

    set_libdir "" "$( pwd )"

    set_docdir "" "$( pwd )/docs"

    set_mandir "" "$( pwd )/docs"

fi

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

# Some sanity checks, now

# We check for grep and sed manually, because they are used in has_or_abort

printf "Checking for 'grep'... "

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

    echo "${grep} (cached)"

else

    grep="$( which grep 2>/dev/null )"

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

        echo "not found"

    else

        echo "${grep}"

        printf "Checking whether '${grep}' supports -E... "

        if echo 'foo' |"${grep}" -E 'foo' >/dev/null 2>&1; then

            echo "yes"

        else

            echo "no"

            grep=

        fi

    fi

fi

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

    echo "Either you are missing entirely the needed tool,"

    echo "or the version you have is too old."

    echo "You can give the path to this tool using: --with-grep=PATH"

    do_error "Bailing out..."

fi

printf "Checking for 'sed'... "

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

    echo "${sed} (cached)"

else

    sed="$( which sed 2>/dev/null )"

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

        echo "not found"

    else

        echo "${sed}"

        printf "Checking whether '${sed}' supports -i and -e... "

        touch .ct-ng.sed.test

        if "${sed}" -r -i -e 's/foo/bar/' .ct-ng.sed.test >/dev/null 2>&1; then

            echo "yes"

        else

            echo "no"

            sed=

        fi

        rm -f .ct-ng.sed.test

    fi

fi

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

    echo "Either you are missing entirely the needed tool,"

    echo "or the version you have is too old."

    echo "You can give the path to this tool using: --with-sed=PATH"

    do_error "Bailing out..."

fi

# Check the existence of absolutely required tools

save_IFS="${IFS}"

IFS='

'

for tool in ${TOOLS_TO_CHECK}; do

    has_or_abort "${tool}"

done

IFS="${save_IFS}"

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

# Compute the version string

# 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

    *+hg|hg)

        REVISION="$( hg id -n 2>/dev/null )"

        case "${REVISION}" in

            "")

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

            *)

                VERSION="${VERSION}_$( hg id -b )@${REVISION%%+}_$( hg id -i )"

                ;;

        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}"

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

# Compute and check install paths

# 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

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

# That's all, folks!

printf "Building up Makefile... "

var_list="grep

          sed

          $( printf "${TOOLS_TO_CHECK}"                                 \

             |"${sed}" -r -e 's/^(([^=:]+):.+|[^:=]+=.+|[^:=]+)$/\2/;'

           )"

var_sed="$( for var_name in ${var_list}; do

                eval echo 's,@@${var_name}@@,${'"${var_name}"'},g'

            done 

          )"

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

                s,@@LIBDIR@@,${LIBDIR},g

                s,@@DOCDIR@@,${DOCDIR},g

                s,@@MANDIR@@,${MANDIR},g

                s,@@VERSION@@,${VERSION},g

                s,@@DATE@@,${DATE},g

                ${var_sed}

                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}'

Now run:

  make

__EOF__

if [ "${LOCAL_set}" != "y" ]; then

    printf "  make install\n"

fi