# This file contains some usefull common functions

 # Copyright 2007 Yann E. MORIN

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

 # Prepare the fault handler

 CT_OnError() {

     ret=$?

     CT_DoLog ERROR "Build failed in step \"${CT_STEP_MESSAGE[${CT_STEP_COUNT}]}\""

     for((step=(CT_STEP_COUNT-1); step>1; step--)); do

         CT_DoLog ERROR "      called in step \"${CT_STEP_MESSAGE[${step}]}\""

     done

     CT_DoLog ERROR "Error happened in \"${BASH_SOURCE[1]}\" in function \"${FUNCNAME[1]}\" (line unknown, sorry)"

     for((depth=2; ${BASH_LINENO[$((${depth}-1))]}>0; depth++)); do

         CT_DoLog ERROR "      called from \"${BASH_SOURCE[${depth}]}\" at line # ${BASH_LINENO[${depth}-1]} in function \"${FUNCNAME[${depth}]}\""

     done

     [ "${CT_LOG_TO_FILE}" = "y" ] && CT_DoLog ERROR "Look at \"${CT_LOG_FILE}\" for more info on this error."

     CT_STEP_COUNT=1

     CT_DoEnd ERROR

     exit $ret

 }

 # Install the fault handler

 trap CT_OnError ERR

 # Inherit the fault handler in subshells and functions

 set -E

 # Make pipes fail on the _first_ failed command

 # Not supported on bash < 3.x, but we need it, so drop the obsoleting bash-2.x

 set -o pipefail

 # Don't hash commands' locations, and search every time it is requested.

 # This is slow, but needed because of the static/shared core gcc which shall

 # always match to shared if it exists, and only fallback to static if the

 # shared is not found

 set +o hashall

 # Log policy:

 #  - first of all, save stdout so we can see the live logs: fd #6

 exec 6>&1

 #  - then point stdout to the log file (temporary for now)

 tmp_log_file="${CT_TOP_DIR}/log.$$"

 exec >>"${tmp_log_file}"

 # The different log levels:

 CT_LOG_LEVEL_ERROR=0

 CT_LOG_LEVEL_WARN=1

 CT_LOG_LEVEL_INFO=2

 CT_LOG_LEVEL_EXTRA=3

 CT_LOG_LEVEL_DEBUG=4

 CT_LOG_LEVEL_ALL=5

 # A function to log what is happening

 # Different log level are available:

 #   - ERROR:   A serious, fatal error occurred

 #   - WARN:    A non fatal, non serious error occurred, take your responsbility with the generated build

 #   - INFO:    Informational messages

 #   - EXTRA:   Extra informational messages

 #   - DEBUG:   Debug messages

 #   - ALL:     Component's build messages

 # Usage: CT_DoLog <level> [message]

 # If message is empty, then stdin will be logged.

 CT_DoLog() {

     local max_level LEVEL level cur_l cur_L

     local l

     eval max_level="\${CT_LOG_LEVEL_${CT_LOG_LEVEL_MAX}}"

     # Set the maximum log level to DEBUG if we have none

     [ -z "${max_level}" ] && max_level=${CT_LOG_LEVEL_DEBUG}

     LEVEL="$1"; shift

     eval level="\${CT_LOG_LEVEL_${LEVEL}}"

     if [ $# -eq 0 ]; then

         cat -

     else

         echo "${1}"

     fi |( IFS="\n" # We want the full lines, even leading spaces

           CT_PROG_BAR_CPT=0

           indent=$((2*CT_STEP_COUNT))

           while read line; do

               case "${CT_LOG_SEE_TOOLS_WARN},${line}" in

                 y,*"warning:"*)         cur_L=WARN; cur_l=${CT_LOG_LEVEL_WARN};;

                 y,*"WARNING:"*)         cur_L=WARN; cur_l=${CT_LOG_LEVEL_WARN};;

                 *"error:"*)             cur_L=ERROR; cur_l=${CT_LOG_LEVEL_ERROR};;

                 *"make["?*"]:"*"Stop.") cur_L=ERROR; cur_l=${CT_LOG_LEVEL_ERROR};;

                 *)                      cur_L="${LEVEL}"; cur_l="${level}";;

               esac

               l="`printf \"[%-5s]%*s%s%s\" \"${cur_L}\" \"${indent}\" \" \" \"${line}\"`"

               # There will always be a log file, be it /dev/null

               echo -e "${l}"

               if [ ${cur_l} -le ${max_level} ]; then

                   echo -e "\r${l}" >&6

               fi

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

                   [ ${CT_PROG_BAR_CPT} -eq 0  ] && bar="/"

                   [ ${CT_PROG_BAR_CPT} -eq 10 ] && bar="-"

                   [ ${CT_PROG_BAR_CPT} -eq 20 ] && bar="\\"

                   [ ${CT_PROG_BAR_CPT} -eq 30 ] && bar="|"

                   printf "\r[%02d:%02d] %s " $((SECONDS/60)) $((SECONDS%60)) "${bar}" >&6

                   CT_PROG_BAR_CPT=$(((CT_PROG_BAR_CPT+1)%40))

               fi

           done

         )

     return 0

 }

 # Tail message to be logged whatever happens

 # Usage: CT_DoEnd <level>

 CT_DoEnd()

 {

     local level="$1"

     CT_STOP_DATE=`CT_DoDate +%s%N`

     CT_STOP_DATE_HUMAN=`CT_DoDate +%Y%m%d.%H%M%S`

     CT_DoLog "${level:-INFO}" "Build completed at ${CT_STOP_DATE_HUMAN}"

     elapsed=$((CT_STOP_DATE-CT_STAR_DATE))

     elapsed_min=$((elapsed/(60*1000*1000*1000)))

     elapsed_sec=`printf "%02d" $(((elapsed%(60*1000*1000*1000))/(1000*1000*1000)))`

     elapsed_csec=`printf "%02d" $(((elapsed%(1000*1000*1000))/(10*1000*1000)))`

     CT_DoLog ${level:-INFO} "(elapsed: ${elapsed_min}:${elapsed_sec}.${elapsed_csec})"

 }

 # Abort the execution with an error message

 # Usage: CT_Abort <message>

 CT_Abort() {

     CT_DoLog ERROR "$1"

     exit 1

 }

 # Test a condition, and print a message if satisfied

 # Usage: CT_Test <message> <tests>

 CT_Test() {

     local ret

     local m="$1"

     shift

     test "$@" && CT_DoLog WARN "$m"

     return 0

 }

 # Test a condition, and abort with an error message if satisfied

 # Usage: CT_TestAndAbort <message> <tests>

 CT_TestAndAbort() {

     local m="$1"

     shift

     test "$@" && CT_Abort "$m"

     return 0

 }

 # Test a condition, and abort with an error message if not satisfied

 # Usage: CT_TestAndAbort <message> <tests>

 CT_TestOrAbort() {

     local m="$1"

     shift

     test "$@" || CT_Abort "$m"

     return 0

 }

 # Test the presence of a tool, or abort if not found

 # Usage: CT_HasOrAbort <tool>

 CT_HasOrAbort() {

     CT_TestAndAbort "\"${1}\" not found and needed for successfull toolchain build." -z "`CT_Which \"${1}\"`"

     return 0

 }

 # Search a program: wrap "which" for those system where

 # "which" verbosely says there is no match (Mdk are such

 # suckers...)

 # Usage: CT_Which <filename>

 CT_Which() {

   which "$1" 2>/dev/null || true

 }

 # Get current date with nanosecond precision

 # On those system not supporting nanosecond precision, faked with rounding down

 # to the highest entire second

 # Usage: CT_DoDate <fmt>

 CT_DoDate() {

     date "$1" |sed -r -e 's/%N$/000000000/;'

 }

 CT_STEP_COUNT=1

 CT_STEP_MESSAGE[${CT_STEP_COUNT}]="<none>"

 # Memorise a step being done so that any error is caught

 # Usage: CT_DoStep <loglevel> <message>

 CT_DoStep() {

     local start=`CT_DoDate +%s%N`

     CT_DoLog "$1" "================================================================="

     CT_DoLog "$1" "$2"

     CT_STEP_COUNT=$((CT_STEP_COUNT+1))

     CT_STEP_LEVEL[${CT_STEP_COUNT}]="$1"; shift

     CT_STEP_START[${CT_STEP_COUNT}]="${start}"

     CT_STEP_MESSAGE[${CT_STEP_COUNT}]="$1"

     return 0

 }

 # End the step just being done

 # Usage: CT_EndStep

 CT_EndStep() {

     local stop=`CT_DoDate +%s%N`

     local duration=`printf "%032d" $((stop-${CT_STEP_START[${CT_STEP_COUNT}]})) |sed -r -e 's/([[:digit:]]{2})[[:digit:]]{7}$/\.\1/; s/^0+//; s/^\./0\./;'`

     local level="${CT_STEP_LEVEL[${CT_STEP_COUNT}]}"

     local message="${CT_STEP_MESSAGE[${CT_STEP_COUNT}]}"

     CT_STEP_COUNT=$((CT_STEP_COUNT-1))

     CT_DoLog "${level}" "${message}: done in ${duration}s"

     return 0

 }

 # Pushes into a directory, and pops back

 CT_Pushd() {

     pushd "$1" >/dev/null 2>&1

 }

 CT_Popd() {

     popd >/dev/null 2>&1

 }

 # Makes a path absolute

 # Usage: CT_MakeAbsolutePath path

 CT_MakeAbsolutePath() {

     # Try to cd in that directory

     if [ -d "$1" ]; then

         CT_Pushd "$1"

         pwd

         CT_Popd

     else

         # No such directory, fail back to guessing

         case "$1" in

             /*)  echo "$1";;

             *)   echo "`pwd`/$1";;

         esac

     fi

     return 0

 }

 # Creates a temporary directory

 # $1: variable to assign to

 # Usage: CT_MktempDir foo

 CT_MktempDir() {

     # Some mktemp do not allow more than 6 Xs

     eval "$1"="`mktemp -q -d \"${CT_BUILD_DIR}/.XXXXXX\"`"

     CT_TestOrAbort "Could not make temporary directory" -n "${!1}" -a -d "${!1}"

 }

 # Echoes the specified string on stdout until the pipe breaks.

 # Doesn't fail

 # $1: string to echo

 # Usage: CT_DoYes "" |make oldconfig

 CT_DoYes() {

     yes "$1" || true

 }

 # Get the file name extension of a component

 # Usage: CT_GetFileExtension <component_name-component_version>

 # If found, echoes the extension to stdout

 # If not found, echoes nothing on stdout.

 CT_GetFileExtension() {

     local ext

     local file="$1"

     CT_Pushd "${CT_TARBALLS_DIR}"

     # we need to also check for an empty extension for those very

     # peculiar components that don't have one (such as sstrip from

     # buildroot).

     for ext in .tar.gz .tar.bz2 .tgz .tar ''; do

         if [ -f "${file}${ext}" ]; then

             echo "${ext}"

             break

         fi

     done

     CT_Popd

     return 0

 }

 # Download an URL using wget

 # Usage: CT_DoGetFileWget <URL>

 CT_DoGetFileWget() {

     # Need to return true because it is legitimate to not find the tarball at

     # some of the provided URLs (think about snapshots, different layouts for

     # different gcc versions, etc...)

     # Some (very old!) FTP server might not support the passive mode, thus

     # retry without

     # With automated download as we are doing, it can be very dangerous to use

     # -c to continue the downloads. It's far better to simply overwrite the

     # destination file

     wget -nc --progress=dot:binary --tries=3 --passive-ftp "$1" || wget -nc --progress=dot:binary --tries=3 "$1" || true

 }

 # Download an URL using curl

 # Usage: CT_DoGetFileCurl <URL>

 CT_DoGetFileCurl() {

 	# Note: comments about wget method are also valid here

 	# Plus: no good progreess indicator is available with curl,

 	#       so output is consigned to oblivion

 	curl --ftp-pasv -O --retry 3 "$1" >/dev/null || curl -O --retry 3 "$1" >/dev/null || true

 }

 _wget=`CT_Which wget`

 _curl=`CT_Which curl`

 # Wrapper function to call one of curl or wget

 # Usage: CT_DoGetFile <URL>

 CT_DoGetFile() {

     case "${_wget},${_curl}" in

         ,)  CT_DoError "Could find neither wget nor curl";;

         ,*) CT_DoGetFileCurl "$1" 2>&1 |CT_DoLog ALL;;

         *)  CT_DoGetFileWget "$1" 2>&1 |CT_DoLog ALL;;

     esac

 }

 # Download the file from one of the URLs passed as argument

 # Usage: CT_GetFile <filename> [extension] <url> [url ...]

 CT_GetFile() {

     local ext

     local url

     local file="$1"

     local first_ext=""

     shift

     case "$1" in

         .tar.bz2|.tar.gz|.tgz|.tar)

             first_ext="$1"

             shift

             ;;

     esac

     # Do we already have it?

     ext=`CT_GetFileExtension "${file}"`

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

         CT_DoLog DEBUG "Already have \"${file}\""

         return 0

     fi

     CT_Pushd "${CT_TARBALLS_DIR}"

     # We'd rather have a bzip2'ed tarball, then gzipped tarball, plain tarball,

     # or, as a failover, a file without extension.

     # Try local copy first, if it exists

     for ext in ${first_ext} .tar.bz2 .tar.gz .tgz .tar ''; do

         CT_DoLog DEBUG "Trying \"${CT_LOCAL_TARBALLS_DIR}/${file}${ext}\""

         if [ -r "${CT_LOCAL_TARBALLS_DIR}/${file}${ext}" -a \

              "${CT_FORCE_DOWNLOAD}" != "y" ]; then

             CT_DoLog EXTRA "Retrieving \"${file}\" from local storage"

             cp -v "${CT_LOCAL_TARBALLS_DIR}/${file}${ext}" "${file}${ext}" |CT_DoLog ALL

             return 0

         fi

     done

     # Try to download it

     CT_DoLog EXTRA "Retrieving \"${file}\" from network"

     for ext in ${first_ext} .tar.bz2 .tar.gz .tgz .tar ''; do

         # Try all urls in turn

         for url in "$@"; do

             CT_DoLog DEBUG "Trying \"${url}/${file}${ext}\""

             CT_DoGetFile "${url}/${file}${ext}"

             if [ -f "${file}${ext}" ]; then

                 # No need to test if the file already exists because

                 # it does NOT. If it did exist, we'd have been stopped

                 # above, when looking for local copies.

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

                     CT_DoLog EXTRA "Saving \"${file}\" to local storage"

                     cp -v "${file}${ext}" "${CT_LOCAL_TARBALLS_DIR}" |CT_DoLog ALL

                 fi

                 return 0

             fi

         done

     done

     CT_Popd

     CT_Abort "Could not download \"${file}\", and not present in \"${CT_LOCAL_TARBALLS_DIR}\""

 }

 # Extract a tarball and patch the resulting sources if necessary.

 # Some tarballs need to be extracted in specific places. Eg.: glibc addons

 # must be extracted in the glibc directory; uCLibc locales must be extracted

 # in the extra/locale sub-directory of uClibc.

 CT_ExtractAndPatch() {

     local file="$1"

     local base_file=`echo "${file}" |cut -d - -f 1`

     local ver_file=`echo "${file}" |cut -d - -f 2-`

     local official_patch_dir

     local custom_patch_dir

     local libc_addon

     local ext=`CT_GetFileExtension "${file}"`

     CT_TestAndAbort "\"${file}\" not found in \"${CT_TARBALLS_DIR}\"" -z "${ext}"

     local full_file="${CT_TARBALLS_DIR}/${file}${ext}"

     CT_Pushd "${CT_SRC_DIR}"

     # Add-ons need a little love, really.

     case "${file}" in

         glibc-[a-z]*-*)

             CT_TestAndAbort "Trying to extract the C-library addon/locales \"${file}\" when C-library not yet extracted" ! -d "${CT_LIBC_FILE}"

             cd "${CT_LIBC_FILE}"

             libc_addon=y

             [ -f ".${file}.extracted" ] && return 0

             touch ".${file}.extracted"

             ;;

         uClibc-locale-*)

             CT_TestAndAbort "Trying to extract the C-library addon/locales \"${file}\" when C-library not yet extracted" ! -d "${CT_LIBC_FILE}"

             cd "${CT_LIBC_FILE}/extra/locale"

             libc_addon=y

             [ -f ".${file}.extracted" ] && return 0

             touch ".${file}.extracted"

             ;;

     esac

     # If the directory exists, then consider extraction and patching done

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

         CT_DoLog DEBUG "Already extracted \"${file}\""

         return 0

     fi

     CT_DoLog EXTRA "Extracting \"${file}\""

     case "${ext}" in

         .tar.bz2)     tar xvjf "${full_file}" |CT_DoLog ALL;;

         .tar.gz|.tgz) tar xvzf "${full_file}" |CT_DoLog ALL;;

         .tar)         tar xvf  "${full_file}" |CT_DoLog ALL;;

         *)            CT_Abort "Don't know how to handle \"${file}\": unknown extension" ;;

     esac

     # Snapshots might not have the version number in the extracted directory

     # name. This is also the case for some (odd) packages, such as D.U.M.A.

     # Overcome this issue by symlink'ing the directory.

     if [ ! -d "${file}" -a "${libc_addon}" != "y" ]; then

         case "${ext}" in

             .tar.bz2)     base=`tar tjf "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

             .tar.gz|.tgz) base=`tar tzf "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

             .tar)         base=`tar tf  "${full_file}" |head -n 1 |cut -d / -f 1 || true`;;

         esac

         CT_TestOrAbort "There was a problem when extracting \"${file}\"" -d "${base}" -o "${base}" != "${file}"

         ln -s "${base}" "${file}"

     fi

     # Kludge: outside this function, we wouldn't know if we had just extracted

     # a libc addon, or a plain package. Apply patches now.

     CT_DoLog EXTRA "Patching \"${file}\""

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

         # Some addons tarball directly contian the correct addon directory,

         # while others have the addon directory named ofter the tarball.

         # Fix that bu always using the short name (eg: linuxthreads, ports, etc...)

         addon_short_name=`echo "${file}" |sed -r -e 's/^[^-]+-//; s/-[^-]+$//;'`

         [ -d "${addon_short_name}" ] || ln -s "${file}" "${addon_short_name}"

         # If libc addon, we're already in the correct place

     else

         cd "${file}"

     fi

     official_patch_dir=

     custom_patch_dir=

     [ "${CUSTOM_PATCH_ONLY}" = "y" ] || official_patch_dir="${CT_LIB_DIR}/patches/${base_file}/${ver_file}"

     [ "${CT_CUSTOM_PATCH}" = "y" ] && custom_patch_dir="${CT_CUSTOM_PATCH_DIR}/${base_file}/${ver_file}"

     for patch_dir in "${official_patch_dir}" "${custom_patch_dir}"; do

         if [ -n "${patch_dir}" -a -d "${patch_dir}" ]; then

             for p in "${patch_dir}"/*.patch; do

                 if [ -f "${p}" ]; then

                     CT_DoLog DEBUG "Applying patch \"${p}\""

                     patch -g0 -F1 -p1 -f <"${p}" |CT_DoLog ALL

                     CT_TestAndAbort "Failed while applying patch file \"${p}\"" ${PIPESTATUS[0]} -ne 0

                 fi

             done

         fi

     done

     CT_Popd

 }

 # Two wrappers to call config.(guess|sub) either from CT_TOP_DIR or CT_LIB_DIR.

 # Those from CT_TOP_DIR, if they exist, will be be more recent than those from CT_LIB_DIR.

 CT_DoConfigGuess() {

     if [ -x "${CT_TOP_DIR}/tools/config.guess" ]; then

         "${CT_TOP_DIR}/tools/config.guess"

     else

         "${CT_LIB_DIR}/tools/config.guess"

     fi

 }

 CT_DoConfigSub() {

     if [ -x "${CT_TOP_DIR}/tools/config.sub" ]; then

         "${CT_TOP_DIR}/tools/config.sub" "$@"

     else

         "${CT_LIB_DIR}/tools/config.sub" "$@"

     fi

 }

 # Compute the target tuple from what is provided by the user

 # Usage: CT_DoBuildTargetTuple

 # In fact this function takes the environment variables to build the target

 # tuple. It is needed both by the normal build sequence, as well as the

 # sample saving sequence.

 CT_DoBuildTargetTuple() {

     case "${CT_ARCH_BE},${CT_ARCH_LE}" in

         y,) target_endian_eb=eb; target_endian_el=;;

         ,y) target_endian_eb=; target_endian_el=el;;

     esac

     case "${CT_ARCH}" in

         arm)  CT_TARGET="${CT_ARCH}${target_endian_eb}";;

         mips) CT_TARGET="${CT_ARCH}${target_endian_el}";;

         x86*) # Much love for this one :-(

               arch="${CT_ARCH_ARCH}"

               [ -z "${arch}" ] && arch="${CT_ARCH_TUNE}"

               case "${CT_ARCH}" in

                   x86_64)  CT_TARGET=x86_64;;

               	  *)  case "${arch}" in

                           "")                                       CT_TARGET=i386;;

                           i386|i486|i586|i686)                      CT_TARGET="${arch}";;

                           winchip*)                                 CT_TARGET=i486;;

                           pentium|pentium-mmx|c3*)                  CT_TARGET=i586;;

                           nocona|athlon*64|k8|athlon-fx|opteron)    CT_TARGET=x86_64;;

                           pentiumpro|pentium*|athlon*)              CT_TARGET=i686;;

                           *)                                        CT_TARGET=i586;;

                       esac;;

               esac;;

     esac

     case "${CT_TARGET_VENDOR}" in

         "") CT_TARGET="${CT_TARGET}-unknown";;

         *)  CT_TARGET="${CT_TARGET}-${CT_TARGET_VENDOR}";;

     esac

     case "${CT_KERNEL}" in

         linux*)  CT_TARGET="${CT_TARGET}-linux";;

     esac

     case "${CT_LIBC}" in

         glibc)  CT_TARGET="${CT_TARGET}-gnu";;

         uClibc) CT_TARGET="${CT_TARGET}-uclibc";;

     esac

     CT_TARGET=`CT_DoConfigSub "${CT_TARGET}"`

 }

 # This function does pause the build until the user strikes "Return"

 # Usage: CT_DoPause [optional_message]

 CT_DoPause() {

     local foo

     local message="${1:-Pausing for your pleasure}"

     CT_DoLog INFO "${message}"

     read -p "Press \"Enter\" to continue, or Ctrl-C to stop..." foo >&6

     return 0

 }

 # This function saves the state of the toolchain to be able to restart

 # at any one point

 # Usage: CT_DoSaveState <next_step_name>

 CT_DoSaveState() {

 	[ "${CT_DEBUG_CT_SAVE_STEPS}" = "y" ] || return 0

     local state_name="$1"

     local state_dir="${CT_STATE_DIR}/${state_name}"

     CT_DoLog DEBUG "Saving state to restart at step \"${state_name}\"..."

     rm -rf "${state_dir}"

     mkdir -p "${state_dir}"

     case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

         y)  tar_opt=z; tar_ext=.gz;;

         *)  tar_opt=;  tar_ext=;;

     esac

     CT_DoLog DEBUG "  Saving environment and aliases"

     # We must omit shell functions

     set |awk '

          BEGIN { _p = 1; }

          $0~/^[^ ]+ \(\)/ { _p = 0; }

          _p == 1

          $0 == "}" { _p = 1; }

          ' >"${state_dir}/env.sh"

     CT_DoLog DEBUG "  Saving CT_CC_CORE_STATIC_PREFIX_DIR=\"${CT_CC_CORE_STATIC_PREFIX_DIR}\""

     CT_Pushd "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     tar cv${tar_opt}f "${state_dir}/cc_core_static_prefix_dir.tar${tar_ext}" . |CT_DoLog DEBUG

     CT_Popd

     CT_DoLog DEBUG "  Saving CT_CC_CORE_SHARED_PREFIX_DIR=\"${CT_CC_CORE_SHARED_PREFIX_DIR}\""

     CT_Pushd "${CT_CC_CORE_SHARED_PREFIX_DIR}"

     tar cv${tar_opt}f "${state_dir}/cc_core_shared_prefix_dir.tar${tar_ext}" . |CT_DoLog DEBUG

     CT_Popd

     CT_DoLog DEBUG "  Saving CT_PREFIX_DIR=\"${CT_PREFIX_DIR}\""

     CT_Pushd "${CT_PREFIX_DIR}"

     tar cv${tar_opt}f "${state_dir}/prefix_dir.tar${tar_ext}" --exclude '*.log' . |CT_DoLog DEBUG

     CT_Popd

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

         CT_DoLog DEBUG "  Saving log file"

         exec >/dev/null

         case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

             y)  gzip -3 -c "${CT_LOG_FILE}"  >"${state_dir}/log.gz";;

             *)  cat "${CT_LOG_FILE}" >"${state_dir}/log";;

         esac

         exec >>"${CT_LOG_FILE}"

     fi

 }

 # This function restores a previously saved state

 # Usage: CT_DoLoadState <state_name>

 CT_DoLoadState(){

     local state_name="$1"

     local state_dir="${CT_STATE_DIR}/${state_name}"

     local old_RESTART="${CT_RESTART}"

     local old_STOP="${CT_STOP}"

     CT_TestOrAbort "The previous build did not reach the point where it could be restarted at \"${CT_RESTART}\"" -d "${state_dir}"

     # We need to do something special with the log file!

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

         exec >"${state_dir}/tail.log"

     fi

     CT_DoLog INFO "Restoring state at step \"${state_name}\", as requested."

     case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

         y)  tar_opt=z; tar_ext=.gz;;

         *)  tar_opt=;  tar_ext=;;

     esac

     CT_DoLog DEBUG "  Removing previous build directories"

     chmod -R u+rwX "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     rm -rf         "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     mkdir -p       "${CT_PREFIX_DIR}" "${CT_CC_CORE_SHARED_PREFIX_DIR}" "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     CT_DoLog DEBUG "  Restoring CT_PREFIX_DIR=\"${CT_PREFIX_DIR}\""

     CT_Pushd "${CT_PREFIX_DIR}"

     tar xv${tar_opt}f "${state_dir}/prefix_dir.tar${tar_ext}" |CT_DoLog DEBUG

     CT_Popd

     CT_DoLog DEBUG "  Restoring CT_CC_CORE_SHARED_PREFIX_DIR=\"${CT_CC_CORE_SHARED_PREFIX_DIR}\""

     CT_Pushd "${CT_CC_CORE_SHARED_PREFIX_DIR}"

     tar xv${tar_opt}f "${state_dir}/cc_core_shared_prefix_dir.tar${tar_ext}" |CT_DoLog DEBUG

     CT_Popd

     CT_DoLog DEBUG "  Restoring CT_CC_CORE_STATIC_PREFIX_DIR=\"${CT_CC_CORE_STATIC_PREFIX_DIR}\""

     CT_Pushd "${CT_CC_CORE_STATIC_PREFIX_DIR}"

     tar xv${tar_opt}f "${state_dir}/cc_core_static_prefix_dir.tar${tar_ext}" |CT_DoLog DEBUG

     CT_Popd

     # Restore the environment, discarding any error message

     # (for example, read-only bash internals)

     CT_DoLog DEBUG "  Restoring environment"

     . "${state_dir}/env.sh" >/dev/null 2>&1 || true

     # Restore the new RESTART and STOP steps

     CT_RESTART="${old_RESTART}"

     CT_STOP="${old_STOP}"

     unset old_stop old_restart

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

         CT_DoLog DEBUG "  Restoring log file"

         exec >/dev/null

         case "${CT_DEBUG_CT_SAVE_STEPS_GZIP}" in

             y)  zcat "${state_dir}/log.gz" >"${CT_LOG_FILE}";;

             *)  cat "${state_dir}/log" >"${CT_LOG_FILE}";;

         esac

         cat "${state_dir}/tail.log" >>"${CT_LOG_FILE}"

         exec >>"${CT_LOG_FILE}"

         rm -f "${state_dir}/tail.log"

     fi

 }