#!/bin/bash

# Copyright 2007 Yann E. MORIN

# Licensed under the GPL v2. See COPYING in the root of this package.

# This is the main entry point to crosstool

# This will:

#   - download, extract and patch the toolchain components

#   - build and install each components in turn

#   - and eventually test the resulting toolchain

# What this file does is prepare the environment, based upon the user-choosen

# options. It also checks the existing environment for un-friendly variables,

# and builds the tools.

# Parse the common functions

# Note: some initialisation and sanitizing is done while parsing this file,

# most notably:

#  - set trap handler on errors,

#  - don't hash commands lookups,

#  - initialise logging.

. "${CT_LIB_DIR}/scripts/functions"

CT_STAR_DATE=$(CT_DoDate +%s%N)

CT_STAR_DATE_HUMAN=$(CT_DoDate +%Y%m%d.%H%M%S)

# Are we configured? We'll need that later...

CT_TestOrAbort "Configuration file not found. Please create one." -f "${CT_TOP_DIR}/.config"

# Parse the configuration file

# It has some info about the logging facility, so include it early

. "${CT_TOP_DIR}/.config"

# Yes! We can do full logging from now on!

CT_DoLog INFO "Build started ${CT_STAR_DATE_HUMAN}"

# renice oursleves

renice ${CT_NICE} $$ |CT_DoLog DEBUG

CT_DoStep DEBUG "Dumping crosstool-NG configuration"

cat "${CT_TOP_DIR}/.config" |egrep '^(# |)CT_' |CT_DoLog DEBUG

CT_EndStep

# Some sanity checks in the environment and needed tools

CT_DoLog INFO "Checking environment sanity"

CT_DoLog DEBUG "Unsetting and unexporting MAKEFLAGS"

unset MAKEFLAGS

export MAKEFLAGS

# Other environment sanity checks

CT_TestAndAbort "Don't set LD_LIBRARY_PATH. It screws up the build." -n "${LD_LIBRARY_PATH}"

CT_TestAndAbort "Don't set CFLAGS. It screws up the build." -n "${CFLAGS}"

CT_TestAndAbort "Don't set CXXFLAGS. It screws up the build." -n "${CXXFLAGS}"

CT_Test "GREP_OPTIONS screws up the build. Resetting." -n "${GREP_OPTIONS}"

GREP_OPTIONS=

CT_HasOrAbort awk

CT_HasOrAbort sed

CT_HasOrAbort bison

CT_HasOrAbort flex

CT_HasOrAbort lynx

CT_DoLog INFO "Building environment variables"

# Parse architecture-specific functions

. "${CT_LIB_DIR}/arch/${CT_ARCH}/functions"

# Target tuple: CT_TARGET needs a little love:

CT_DoBuildTargetTuple

# Kludge: If any of the configured options needs CT_TARGET,

# then rescan the options file now:

. "${CT_TOP_DIR}/.config"

# Second kludge: merge user-supplied target CFLAGS with architecture-provided

# target CFLAGS

CT_TARGET_CFLAGS="${CT_ARCH_TARGET_CFLAGS} ${CT_TARGET_CFLAGS}"

# Now, build up the variables from the user-configured options.

CT_KERNEL_FILE="${CT_KERNEL}-${CT_KERNEL_VERSION}"

CT_BINUTILS_FILE="binutils-${CT_BINUTILS_VERSION}"

CT_GMP_FILE="gmp-${CT_GMP_VERSION}"

CT_MPFR_FILE="mpfr-${CT_MPFR_VERSION}"

CT_CC_FILE="${CT_CC}-${CT_CC_VERSION}"

CT_LIBC_FILE="${CT_LIBC}-${CT_LIBC_VERSION}"

# Where will we work?

CT_TARBALLS_DIR="${CT_TOP_DIR}/targets/tarballs"

CT_SRC_DIR="${CT_TOP_DIR}/targets/src"

CT_BUILD_DIR="${CT_TOP_DIR}/targets/${CT_TARGET}/build"

CT_DEBUG_INSTALL_DIR="${CT_INSTALL_DIR}/${CT_TARGET}/debug-root"

# Note: we'll always install the core compiler in its own directory, so as to

# not mix the two builds: core and final.

CT_CC_CORE_STATIC_PREFIX_DIR="${CT_BUILD_DIR}/${CT_CC}-core-static"

CT_CC_CORE_SHARED_PREFIX_DIR="${CT_BUILD_DIR}/${CT_CC}-core-shared"

CT_STATE_DIR="${CT_TOP_DIR}/targets/${CT_TARGET}/state"

# We must ensure that we can restart if asked for!

if [ -n "${CT_RESTART}" -a ! -d "${CT_STATE_DIR}"  ]; then

    CT_DoLog ERROR "You asked to restart a non-restartable build"

    CT_DoLog ERROR "This happened because you didn't set CT_DEBUG_CT_SAVE_STEPS"

    CT_DoLog ERROR "in the config options for the previous build, or the state"

    CT_DoLog ERROR "directory for the previous build was deleted."

    CT_Abort "I will stop here to avoid any carnage"

fi

# Make all path absolute, it so much easier!

CT_LOCAL_TARBALLS_DIR=$(CT_MakeAbsolutePath "${CT_LOCAL_TARBALLS_DIR}")

# If the local tarball directory does not exist, say so, and don't try to save there!

if [ ! -d "${CT_LOCAL_TARBALLS_DIR}" ]; then

    CT_DoLog WARN "Directory '${CT_LOCAL_TARBALLS_DIR}' does not exist. Will not save downloaded tarballs to local storage."

    CT_SAVE_TARBALLS=

fi

# Some more sanity checks now that we have all paths set up

case "${CT_LOCAL_TARBALLS_DIR},${CT_TARBALLS_DIR},${CT_SRC_DIR},${CT_BUILD_DIR},${CT_PREFIX_DIR},${CT_INSTALL_DIR}" in

    *" "*) CT_Abort "Don't use spaces in paths, it breaks things.";;

esac

# Check now if we can write to the destination directory:

if [ -d "${CT_INSTALL_DIR}" ]; then

    CT_TestAndAbort "Destination directory '${CT_INSTALL_DIR}' is not removable" ! -w $(dirname "${CT_INSTALL_DIR}")

fi

# Good, now grab a bit of informations on the system we're being run on,

# just in case something goes awok, and it's not our fault:

CT_SYS_USER=$(id -un)

CT_SYS_HOSTNAME=$(hostname -f 2>/dev/null || true)

# Hmmm. Some non-DHCP-enabled machines do not have an FQDN... Fall back to node name.

CT_SYS_HOSTNAME="${CT_SYS_HOSTNAME:-$(uname -n)}"

CT_SYS_KERNEL=$(uname -s)

CT_SYS_REVISION=$(uname -r)

# MacOS X lacks '-o' :

CT_SYS_OS=$(uname -o || echo "Unknown (maybe MacOS-X)")

CT_SYS_MACHINE=$(uname -m)

CT_SYS_PROCESSOR=$(uname -p)

CT_SYS_GCC=$(gcc -dumpversion)

CT_SYS_TARGET=$(CT_DoConfigGuess)

CT_TOOLCHAIN_ID="crosstool-${CT_VERSION} build ${CT_STAR_DATE_HUMAN} by ${CT_SYS_USER}@${CT_SYS_HOSTNAME}"

CT_DoLog EXTRA "Preparing working directories"

# Ah! The build directory shall be eradicated, even if we restart!

if [ -d "${CT_BUILD_DIR}" ]; then

    mv "${CT_BUILD_DIR}" "${CT_BUILD_DIR}.$$"

    chmod -R u+w "${CT_BUILD_DIR}.$$"

    setsid nohup rm -rf "${CT_BUILD_DIR}.$$" >/dev/null 2>&1 &

fi

# Don't eradicate directories if we need to restart

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

    # Get rid of pre-existing installed toolchain and previous build directories.

    # We need to do that _before_ we can safely log, because the log file will

    # most probably be in the toolchain directory.

    if [ "${CT_FORCE_DOWNLOAD}" = "y" -a -d "${CT_TARBALLS_DIR}" ]; then

        mv "${CT_TARBALLS_DIR}" "${CT_TARBALLS_DIR}.$$"

        chmod -R u+w "${CT_TARBALLS_DIR}.$$"

        setsid nohup rm -rf "${CT_TARBALLS_DIR}.$$" >/dev/null 2>&1 &

    fi

    if [ "${CT_FORCE_EXTRACT}" = "y" -a -d "${CT_SRC_DIR}" ]; then

        mv "${CT_SRC_DIR}" "${CT_SRC_DIR}.$$"

        chmod -R u+w "${CT_SRC_DIR}.$$"

        setsid nohup rm -rf "${CT_SRC_DIR}.$$" >/dev/null 2>&1 &

    fi

    if [ -d "${CT_INSTALL_DIR}" ]; then

        mv "${CT_INSTALL_DIR}" "${CT_INSTALL_DIR}.$$"

        chmod -R u+w "${CT_INSTALL_DIR}.$$"

        setsid nohup rm -rf "${CT_INSTALL_DIR}.$$" >/dev/null 2>&1 &

    fi

    if [ -d "${CT_DEBUG_INSTALL_DIR}" ]; then

        mv "${CT_DEBUG_INSTALL_DIR}" "${CT_DEBUG_INSTALL_DIR}.$$"

        chmod -R u+w "${CT_DEBUG_INSTALL_DIR}.$$"

        setsid nohup rm -rf "${CT_DEBUG_INSTALL_DIR}.$$" >/dev/null 2>&1 &

    fi

    # In case we start anew, get rid of the previously saved state directory

    if [ -d "${CT_STATE_DIR}" ]; then

        mv "${CT_STATE_DIR}" "${CT_STATE_DIR}.$$"

        chmod -R u+w "${CT_STATE_DIR}.$$"

        setsid nohup rm -rf "${CT_STATE_DIR}.$$" >/dev/null 2>&1 &

    fi

fi

# Create the directories we'll use, even if restarting: it does no harm to

# create already existent directories, and CT_BUILD_DIR needs to be created

# anyway

mkdir -p "${CT_TARBALLS_DIR}"

mkdir -p "${CT_SRC_DIR}"

mkdir -p "${CT_BUILD_DIR}"

mkdir -p "${CT_INSTALL_DIR}"

mkdir -p "${CT_PREFIX_DIR}"

mkdir -p "${CT_DEBUG_INSTALL_DIR}"

mkdir -p "${CT_CC_CORE_STATIC_PREFIX_DIR}"

mkdir -p "${CT_CC_CORE_SHARED_PREFIX_DIR}"

mkdir -p "${CT_STATE_DIR}"

# Kludge: CT_INSTALL_DIR and CT_PREFIX_DIR might have grown read-only if

# the previous build was successful. To be able to move the logfile there,

# switch them back to read/write

chmod -R u+w "${CT_INSTALL_DIR}" "${CT_PREFIX_DIR}"

# Redirect log to the actual log file now we can

# It's quite understandable that the log file will be installed in the install

# directory, so we must first ensure it exists and is writeable (above) before

# we can log there

exec >/dev/null

case "${CT_LOG_TO_FILE}" in

    y)  CT_LOG_FILE="${CT_PREFIX_DIR}/build.log"

        cat "${tmp_log_file}" >>"${CT_LOG_FILE}"

        rm -f "${tmp_log_file}"

        exec >>"${CT_LOG_FILE}"

        ;;

    *)  rm -f "${tmp_log_file}"

        ;;

esac

# Set environment for proxy access

# This has to be done even if we are restarting, as they don't get

# saved in the step snapshot.

case "${CT_PROXY_TYPE}" in

  none) ;;

  http)

    http_proxy="http://"

    case  "${CT_PROXY_USER}:${CT_PROXY_PASS}" in

      :)      ;;

      :*)     http_proxy="${http_proxy}:${CT_PROXY_PASS}@";;

      *:)     http_proxy="${http_proxy}${CT_PROXY_USER}@";;

      *:*)    http_proxy="${http_proxy}${CT_PROXY_USER}:${CT_PROXY_PASS}@";;

    esac

    export http_proxy="${http_proxy}${CT_PROXY_HOST}:${CT_PROXY_PORT}/"

    export https_proxy="${http_proxy}"

    export ftp_proxy="${http_proxy}"

    CT_DoLog DEBUG "http_proxy='${http_proxy}'"

    ;;

  sockssys)

    CT_HasOrAbort tsocks

    # Force not using HTTP proxy

    unset http_proxy ftp_proxy https_proxy

    . tsocks -on

    ;;

  socks*)

    CT_HasOrAbort tsocks

    # Force not using HTTP proxy

    unset http_proxy ftp_proxy https_proxy

    # Remove any lingering config file from any previous run

    rm -f "${CT_BUILD_DIR}/tsocks.conf"

    # Find all interfaces and build locally accessible networks

    server_ip=$(ping -c 1 -W 2 "${CT_PROXY_HOST}" |head -n 1 |sed -r -e 's/^[^\(]+\(([^\)]+)\).*$/\1/;' || true)

    CT_TestOrAbort "SOCKS proxy '${CT_PROXY_HOST}' has no IP." -n "${server_ip}"

    /sbin/ifconfig |gawk -v server_ip="${server_ip}" '

      BEGIN {

        split( server_ip, tmp, "\\." );

        server_ip_num = tmp[1] * 2^24 + tmp[2] * 2^16 + tmp[3] * 2^8 + tmp[4] * 2^0;

        pairs = 0;

      }

      $0 ~ /^[[:space:]]*inet addr:/ {

        split( $2, tmp, ":|\\." );

        if( ( tmp[2] == 127 ) && ( tmp[3] == 0 ) && ( tmp[4] == 0 ) && ( tmp[5] == 1 ) ) {

          /* Skip 127.0.0.1, it'\''s taken care of by tsocks itself */

          next;

        }

        ip_num = tmp[2] * 2^24 + tmp[3] * 2^16 + tmp[4] * 2 ^8 + tmp[5] * 2^0;

        i = 32;

        do {

          i--;

          mask = 2^32 - 2^i;

        } while( (i!=0) && ( and( server_ip_num, mask ) == and( ip_num, mask ) ) );

        mask = and( 0xFFFFFFFF, lshift( mask, 1 ) );

        if( (i!=0) && (mask!=0) ) {

          masked_ip = and( ip_num, mask );

          for( i=0; i<pairs; i++ ) {

            if( ( masked_ip == ips[i] ) && ( mask == masks[i] ) ) {

              next;

            }

          }

          ips[pairs] = masked_ip;

          masks[pairs] = mask;

          pairs++;

          printf( "local = %d.%d.%d.%d/%d.%d.%d.%d\n",

                  and( 0xFF, masked_ip / 2^24 ),

                  and( 0xFF, masked_ip / 2^16 ),

                  and( 0xFF, masked_ip / 2^8 ),

                  and( 0xFF, masked_ip / 2^0 ),

                  and( 0xFF, mask / 2^24 ),

                  and( 0xFF, mask / 2^16 ),

                  and( 0xFF, mask / 2^8 ),

                  and( 0xFF, mask / 2^0 ) );

        }

      }

    ' >"${CT_BUILD_DIR}/tsocks.conf"

    ( echo "server = ${server_ip}";

      echo "server_port = ${CT_PROXY_PORT}";

      [ -n "${CT_PROXY_USER}"   ] && echo "default_user=${CT_PROXY_USER}";

      [ -n "${CT_PROXY_PASS}" ] && echo "default_pass=${CT_PROXY_PASS}";

    ) >>"${CT_BUILD_DIR}/tsocks.conf"

    case "${CT_PROXY_TYPE/socks}" in

      4|5) proxy_type="${CT_PROXY_TYPE/socks}";;

      auto)

        reply=$(inspectsocks "${server_ip}" "${CT_PROXY_PORT}" 2>&1 || true)

        case "${reply}" in

          *"server is a version 4 socks server") proxy_type=4;;

          *"server is a version 5 socks server") proxy_type=5;;

          *) CT_Abort "Unable to determine SOCKS proxy type for '${CT_PROXY_HOST}:${CT_PROXY_PORT}'"

        esac

      ;;

    esac

    echo "server_type = ${proxy_type}" >> "${CT_BUILD_DIR}/tsocks.conf"

    validateconf -f "${CT_BUILD_DIR}/tsocks.conf" 2>&1 |CT_DoLog DEBUG

    export TSOCKS_CONF_FILE="${CT_BUILD_DIR}/tsocks.conf"

    . tsocks -on

    ;;

esac

# Setting up the rest of the environment only if not restarting

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

    # Determine build system if not set by the user

    CT_Test "You did not specify the build system. That's OK, I can guess..." -z "${CT_BUILD}"

    CT_BUILD="${CT_BUILD:-$(CT_DoConfigGuess)}"

    CT_BUILD=$(CT_DoConfigSub "${CT_BUILD}")

    # Arrange paths depending on wether we use sys-root or not.

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

        CT_SYSROOT_DIR="${CT_PREFIX_DIR}/${CT_TARGET}/sys-root"

        CT_HEADERS_DIR="${CT_SYSROOT_DIR}/usr/include"

        BINUTILS_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"

        CC_CORE_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"

        CC_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"

        LIBC_SYSROOT_ARG=""

        # glibc's prefix must be exactly /usr, else --with-sysroot'd gcc will get

        # confused when $sysroot/usr/include is not present.

        # Note: --prefix=/usr is magic!

        # See http://www.gnu.org/software/libc/FAQ.html#s-2.2

    else

        # plain old way. All libraries in prefix/target/lib

        CT_SYSROOT_DIR="${CT_PREFIX_DIR}/${CT_TARGET}"

        CT_HEADERS_DIR="${CT_SYSROOT_DIR}/include"

        # hack!  Always use --with-sysroot for binutils.

        # binutils 2.14 and later obey it, older binutils ignore it.

        # Lets you build a working 32->64 bit cross gcc

        BINUTILS_SYSROOT_ARG="--with-sysroot=${CT_SYSROOT_DIR}"

        # Use --with-headers, else final gcc will define disable_glibc while

        # building libgcc, and you'll have no profiling

        CC_CORE_SYSROOT_ARG="--without-headers"

        CC_SYSROOT_ARG="--with-headers=${CT_HEADERS_DIR}"

        LIBC_SYSROOT_ARG="prefix="

    fi

    # Prepare the 'lib' directories in sysroot, else the ../lib64 hack used by

    # 32 -> 64 bit crosscompilers won't work, and build of final gcc will fail with

    #  "ld: cannot open crti.o: No such file or directory"

    mkdir -p "${CT_SYSROOT_DIR}/lib"

    mkdir -p "${CT_SYSROOT_DIR}/usr/lib"

    # Canadian-cross are really picky on the way they are built. Tweak the values.

    CT_UNIQ_BUILD=$(echo "${CT_BUILD}" |sed -r -e 's/-/-build_/')

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

        # Arrange so that gcc never, ever think that build system == host system

        CT_CANADIAN_OPT="--build=${CT_UNIQ_BUILD}"

        # We shall have a compiler for this target!

        # Do test here...

    else

        CT_HOST="${CT_BUILD}"

        CT_CANADIAN_OPT="--build=${CT_BUILD}"

        # Add the target toolchain in the path so that we can build the C library

        # Carefully add paths in the order we want them:

        #  - first try in ${CT_PREFIX_DIR}/bin

        #  - then try in ${CT_CC_CORE_SHARED_PREFIX_DIR}/bin

        #  - then try in ${CT_CC_CORE_STATIC_PREFIX_DIR}/bin

        #  - fall back to searching user's PATH

        export PATH="${CT_PREFIX_DIR}/bin:${CT_CC_CORE_SHARED_PREFIX_DIR}/bin:${CT_CC_CORE_STATIC_PREFIX_DIR}/bin:${PATH}"

    fi

    # Modify GCC_HOST to never be equal to $BUILD or $TARGET

    # This strange operation causes gcc to always generate a cross-compiler

    # even if the build machine is the same kind as the host.

    # This is why CC has to be set when doing a canadian cross; you can't find a

    # host compiler by appending -gcc to our whacky $GCC_HOST

    # Kludge: it is reported that the above causes canadian crosses with cygwin

    # hosts to fail, so avoid it just in that one case.  It would be cleaner to

    # just move this into the non-canadian case above, but I'm afraid that might

    # cause some configure script somewhere to decide that since build==host, they

    # could run host binaries.

    # (Copied almost as-is from original crosstool):

    case "${CT_KERNEL},${CT_CANADIAN}" in

        cygwin,y) ;;

        *,y)      CT_HOST=$(echo "${CT_HOST}" |sed -r -e 's/-/-host_/;');;

    esac

    # Ah! Recent versions of binutils need some of the build and/or host system

    # (read CT_BUILD and CT_HOST) tools to be accessible (ar is but an example).

    # Do that:

    CT_DoLog DEBUG "Making build system tools available"

    mkdir -p "${CT_PREFIX_DIR}/bin"

    for tool in ar as dlltool ${CT_CC_NATIVE:=gcc} gnatbind gnatmake ld nm ranlib strip windres objcopy objdump; do

        tmp=$(CT_Which ${tool})

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

            ln -sfv "${tmp}" "${CT_PREFIX_DIR}/bin/${CT_BUILD}-${tool}"

            ln -sfv "${tmp}" "${CT_PREFIX_DIR}/bin/${CT_UNIQ_BUILD}-${tool}"

            ln -sfv "${tmp}" "${CT_PREFIX_DIR}/bin/${CT_HOST}-${tool}"

        fi |CT_DoLog DEBUG

    done

    # Help gcc

    CT_CFLAGS_FOR_HOST=

    [ "${CT_USE_PIPES}" = "y" ] && CT_CFLAGS_FOR_HOST="${CT_CFLAGS_FOR_HOST} -pipe"

    # Override the configured jobs with what's been given on the command line

    [ -n "${CT_JOBS}" ] && CT_PARALLEL_JOBS="${CT_JOBS}"

    # And help make go faster

    PARALLELMFLAGS=

    [ ${CT_PARALLEL_JOBS} -ne 0 ] && PARALLELMFLAGS="${PARALLELMFLAGS} -j${CT_PARALLEL_JOBS}"

    [ ${CT_LOAD} -ne 0 ] && PARALLELMFLAGS="${PARALLELMFLAGS} -l${CT_LOAD}"

    CT_DoStep EXTRA "Dumping internal crosstool-NG configuration"

    CT_DoLog EXTRA "Building a toolchain for:"

    CT_DoLog EXTRA "  build  = ${CT_BUILD}"

    CT_DoLog EXTRA "  host   = ${CT_HOST}"

    CT_DoLog EXTRA "  target = ${CT_TARGET}"

    set |egrep '^CT_.+=' |sort |CT_DoLog DEBUG

    CT_EndStep

fi

# Include sub-scripts instead of calling them: that way, we do not have to

# export any variable, nor re-parse the configuration and functions files.

. "${CT_LIB_DIR}/scripts/build/kernel_${CT_KERNEL}.sh"

. "${CT_LIB_DIR}/scripts/build/gmp.sh"

. "${CT_LIB_DIR}/scripts/build/mpfr.sh"

. "${CT_LIB_DIR}/scripts/build/binutils.sh"

. "${CT_LIB_DIR}/scripts/build/libc_${CT_LIBC}.sh"

. "${CT_LIB_DIR}/scripts/build/cc_${CT_CC}.sh"

. "${CT_LIB_DIR}/scripts/build/debug.sh"

. "${CT_LIB_DIR}/scripts/build/tools.sh"

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

    CT_DoStep INFO "Retrieving needed toolchain components' tarballs"

    do_kernel_get

    do_gmp_get

    do_mpfr_get

    do_binutils_get

    do_cc_get

    do_libc_get

    do_tools_get

    do_debug_get

    CT_EndStep

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

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

            mv "${CT_SRC_DIR}" "${CT_SRC_DIR}.force.$$"

            setsid nohup rm -rf "${CT_SRC_DIR}.force.$$" >/dev/null 2>&1

            mkdir -p "${CT_SRC_DIR}"

        fi

        CT_DoStep INFO "Extracting and patching toolchain components"

        do_kernel_extract

        do_gmp_extract

        do_mpfr_extract

        do_binutils_extract

        do_cc_extract

        do_libc_extract

        do_tools_extract

        do_debug_extract

        CT_EndStep

    fi

fi

# Now for the job by itself. Go have a coffee!

if [ "${CT_ONLY_DOWNLOAD}" != "y" -a "${CT_ONLY_EXTRACT}" != "y" ]; then

    # Because of CT_RESTART, this becomes quite complex

    do_stop=0

    prev_step=

    [ -n "${CT_RESTART}" ] && do_it=0 || do_it=1

    # Aha! CT_STEPS comes from steps.mk!

    for step in ${CT_STEPS}; do

        if [ ${do_it} -eq 0 ]; then

            if [ "${CT_RESTART}" = "${step}" ]; then

                CT_DoLoadState "${step}"

                do_it=1

                do_stop=0

            fi

        else

            CT_DoSaveState ${step}

            if [ ${do_stop} -eq 1 ]; then

                CT_DoLog ERROR "Stopping just after step '${prev_step}', as requested."

                exit 0

            fi

        fi

        if [ ${do_it} -eq 1 ]; then

            do_${step}

            if [ "${CT_STOP}" = "${step}" ]; then

                do_stop=1

            fi

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

                CT_DoPause "Step '${step}' finished"

            fi

        fi

        prev_step="${step}"

    done

    CT_DoLog DEBUG "Removing access to the build system tools"

    find "${CT_PREFIX_DIR}/bin" -name "${CT_BUILD}-"'*' -exec rm -fv {} \; |CT_DoLog DEBUG

    find "${CT_PREFIX_DIR}/bin" -name "${CT_UNIQ_BUILD}-"'*' -exec rm -fv {} \; |CT_DoLog DEBUG

    find "${CT_PREFIX_DIR}/bin" -name "${CT_HOST}-"'*' -exec rm -fv {} \; |CT_DoLog DEBUG

    # Install the /populator/

    CT_DoLog EXTRA "Installing the populate helper"

    sed -r -e 's,@@CT_READELF@@,'"${CT_PREFIX_DIR}/bin/${CT_TARGET}-readelf"',g;'   \

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

           "${CT_LIB_DIR}/tools/populate.in" >"${CT_PREFIX_DIR}/bin/${CT_TARGET}-populate"

    chmod 755 "${CT_PREFIX_DIR}/bin/${CT_TARGET}-populate"

    # Create the aliases to the target tools

    CT_DoStep EXTRA "Creating toolchain aliases"

    CT_Pushd "${CT_PREFIX_DIR}/bin"

    for t in "${CT_TARGET}-"*; do

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

            _t=$(echo "$t" |sed -r -e 's/^'"${CT_TARGET}"'-/'"${CT_TARGET_ALIAS}"'-/;')

            CT_DoLog DEBUG "Linking '${_t}' -> '${t}'"

            ln -sv "${t}" "${_t}" 2>&1 |CT_DoLog ALL

        fi

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

            _t=$(echo "$t" |sed -r -e "${CT_TARGET_ALIAS_SED_EXPR}")

            CT_DoLog DEBUG "Linking '${_t}' -> '${t}'"

            ln -sv "${t}" "${_t}" 2>&1 |CT_DoLog ALL

        fi

    done

    CT_Popd

    CT_EndStep

    # Remove the generated documentation files

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

    	CT_DoLog INFO "Removing installed documentation"

        rm -rf "${CT_PREFIX_DIR}/"{,usr/}{man,info}

        rm -rf "${CT_SYSROOT_DIR}/"{,usr/}{man,info}

        rm -rf "${CT_DEBUG_INSTALL_DIR}/"{,usr/}{man,info}

    fi

fi

CT_DoEnd INFO

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

    CT_DoLog EXTRA "Compressing log file"

    exec >/dev/null

    bzip2 -9 "${CT_LOG_FILE}"

fi

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

    # OK, now we're done, set the toolchain read-only

    # Don't log, the log file may become read-only any moment...

    chmod -R a-w "${CT_INSTALL_DIR}" >/dev/null 2>&1

fi

trap - EXIT