#!/bin/sh

 myname="${0##*/}"

 VERSION=$( cat .version )

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

 PREFIX_DEFAULT=/usr/local

 BINDIR_set=

 LIBDIR_set=

 DOCDIR_set=

 MANDIR_set=

 LOCAL_set=

 FORCE=

 do_quit=

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

 do_error() {

     printf "${myname}: ${@}\n"

     exit 1

 }

 # 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

         --*=?*)

             printf "${1#*=}"

             return 0

             ;;

         *)

             printf "${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" )"

 }

 # var_list is a list of variables, each one holding a path to a

 # tool, either detected by ./configure, or specified by the user.

 var_list=""

 # This function adds a variable name to the above list of variable names.

 # $1: the name of the variable to add to the list

 add_to_var_list() {

     var_list="${var_list} ${1}"

 }

 # A function to test for required tools/headers/libraries

 # Return 0 (true) if found, !0 (false) if not found

 #

 # $*: [prog|inc|lib]=<name[ name...]>

 #     the name(s) of tool(s) to test for

 #     mandatory

 #       eg: prog=bash   prog="curl wget"

 # $*: var=<var_name>

 #     the name of the variable to test and set

 #     optional

 #       eg: var=bash    if ${bash} is set and non-null, use that,

 #                       else check for bash and set bash=$(which bash)

 # $*: ver=<regexp>

 #     for each 'prog', test if $(prog --version) matches 'regexp'

 #     optional

 #       eg: ver='^GNU bash, version [34]\.'

 # $*: err=<error_message>

 #     the error message to print if tool is missing

 #     optional, defaults to: '${prog}: none found'

 #       eg: err="'bash' 3.x or above was not found"

 check_for() {

     local prog inc lib

     local var ver err

     local val

     local item

     local where

     local status

     for item in "${@}"; do

         case "${item}" in

             prog=*|inc=*|lib=*|var=*|ver=*|err=*)

                 eval ${item%%=*}="'${item#*=}'"

                 ;;

             *)  do_error "has_or_abort: incorrect parameters: '$@'";;

         esac

     done

     case "${prog}:${inc}:${lib}" in

         ?*::)

             for item in ${prog}; do

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

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

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

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

                         printf "${val} (cached)\n"

                         add_to_var_list "${var}"

                         return 0

                     fi

                 fi

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

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

                     printf "no\n"

                     continue

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

                     str=$( LC_ALL=C "${where}" --version 2>&1   \

                            |grep -E "${ver}"                    \

                            |head -n 1

                          )

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

                         printf "no\n"

                         unset where

                         continue

                     fi

                 fi

                 status="${where}"

                 break

             done

             ;;

         :?*:)

             for item in ${inc}; do

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

                 if printf "#include \"${item}\"" |gcc -x c -c - -o /dev/null >/dev/null 2>&1; then

                     where="${item}"

                     status=yes

                     break;

                 fi

                 printf "no\n"

             done

             ;;

         ::?*)

             for item in ${lib}; do

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

                 where="$( gcc -print-file-name="${item}" )"

                 if [ "${where}" != "${item}" ]; then

                     where="$( readlink -e "${where}" )"

                     status=yes

                     break;

                 fi

                 printf "no\n"

             done

             ;;

     esac

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

         printf "\n${err:-${prog}${inc}${lib}: none found}\n\n"

         printf "Either you are missing entirely the needed tool,\n"

         printf "or the version you have is too old.\n"

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

             printf "You can give the path to this tool using: --with-${var}=PATH\n"

         fi

         printf "\n"

         return 1

     fi

     printf "${status}"

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

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

         add_to_var_list "${var}"

     fi

     printf "\n"

 }

 # This function checks for a tool, and aborts if not found

 # See check_for(), above, for how to call has_or_abort

 has_or_abort() {

     if ! check_for "$@"; then

         # FORCE can be set in the environment

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

         printf "\n"

         printf "<*                                          *>\n"

         printf "<*            FORCE in action:              *>\n"

         printf "<* Continuing despite missing pre-requisite *>\n"

         printf "<*          Prepare for breakage            *>\n"

         printf "<*                                          *>\n"

         printf "\n"

     fi

 }

 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 continue, even in case

                           some pre-requisites are missing

 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 >= 3.80

   --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;;

         --force)    FORCE=1; shift;;

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

         # Skip, auto-stuff compatibility

         --build=*|--host=*|--infodir=*|--datadir=*|--sysconfdir=*|--localstatedir=*) shift;;

         --build|--host|--infodir|--datadir|--sysconfdir|--localstatedir)             shift 2;;

         *)          printf "Unrecognised option: '${1}'\n"; 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 check_for()

 printf "Checking for 'grep'... "

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

     printf "${grep} (cached)\n"

 else

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

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

         printf "not found\n"

     else

         printf "${grep}\n"

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

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

             printf "yes\n"

         else

             printf "no\n"

             grep=

         fi

     fi

 fi

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

     printf "Either you are missing entirely the needed tool,\n"

     printf "or the version you have is too old.\n"

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

     do_error "Bailing out..."

 fi

 add_to_var_list grep

 printf "Checking for 'sed'... "

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

     printf "${sed} (cached)\n"

 else

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

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

         printf "not found\n"

     else

         printf "${sed}\n"

         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

             printf "yes\n"

         else

             printf "no\n"

             sed=

         fi

         rm -f .ct-ng.sed.test

     fi

 fi

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

     printf "Either you are missing entirely the needed tool,\n"

     printf "or the version you have is too old.\n"

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

     do_error "Bailing out..."

 fi

 add_to_var_list sed

 # The regular list of tools we can now easily check for

 has_or_abort prog=bash                              \

              var=bash                               \

              ver='^GNU bash, version (3\.[1-9]|4)'  \

              err="'bash' 3.1 or above was not found"

 has_or_abort prog=cut

 has_or_abort prog=install var=install

 has_or_abort prog=make                                  \

              var=make                                   \

              ver='^GNU Make (3.[89][[:digit:]]|[4-9])'  \

              err="GNU 'make' 3.80 or above was not found"

 has_or_abort prog=gcc

 has_or_abort prog="awk gawk" ver='^GNU Awk' err="GNU 'awk' was not found"

 has_or_abort prog=bison

 has_or_abort prog=flex

 has_or_abort prog=makeinfo

 has_or_abort prog=automake                                                      \

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

              err="'automake' 1.10 or above was not found"

 has_or_abort prog=libtool                                                                           \

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

              err="'libtool' 1.5.26 or above was not found"

 has_or_abort prog=stat ver='GNU coreutils'

 has_or_abort prog="aria2c curl wget"

 has_or_abort prog=cvs

 has_or_abort prog=patch

 has_or_abort prog=tar

 has_or_abort prog=gzip

 has_or_abort prog=bzip2

 has_or_abort prog=lzma

 has_or_abort prog=readlink

 has_or_abort inc="ncurses/ncurses.h ncurses/curses.h ncurses.h curses.h"    \

              err="'ncurses' headers files were not found"

 ncurses_libs="$( for l in ncursesw ncurses curses; do   \

                      for x in so a dylib; do            \

                          printf "lib$l.$x ";            \

                      done;                              \

                  done                                   \

                )"

 has_or_abort lib="${ncurses_libs}"                  \

              err="'ncurses' library was not found"

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

 # Compute the version string

 # If this version is n hg clone, 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 || true )"

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

         ;;

 esac

 printf "${VERSION}\n"

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

 # 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"

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

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

 # Install support files in our own sub-dir, so as not to mangle (system)

 # files and dirs, but only if not --local

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

     LIBDIR="${LIBDIR}/ct-ng-${VERSION}"

     DOCDIR="${DOCDIR}/ct-ng-${VERSION}"

 fi

 # 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_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