diff --git a/tooling/compare-builds.sh b/tooling/compare-builds.sh
new file mode 100644
index 000000000..dae1eea65
--- /dev/null
+++ b/tooling/compare-builds.sh
@@ -0,0 +1,585 @@
+#!/bin/bash
+# ********************************************************************************
+# Copyright (c) 2024 Contributors to the Eclipse Foundation
+#
+# See the NOTICE file(s) with this work for additional
+# information regarding copyright ownership.
+#
+# This program and the accompanying materials are made
+# available under the terms of the Apache Software License 2.0
+# which is available at https://www.apache.org/licenses/LICENSE-2.0.
+#
+# SPDX-License-Identifier: Apache-2.0
+# ********************************************************************************
+
+#
+# useful variables: DO_BREAK DO_RESULTS
+#                   DO_DEPS RFAT
+#                   JAVA_HOME               
+
+#######################################################################################################################
+# This is top level script for comparing two jdks.  It 
+# This script expects exactly two args - tag:os.arch/dir/archive, two times
+# eg: compare_builds.sh  /usr/lib/jvm/java-21-openjdk /my/home/my_custom_tarball.tar.xz
+# eg: compare_builds.sh  /my/custom/dir/with_jdk jdk-21.0.4+7:windows.x64
+# if the parameter is tag, the temurin jdk of given tag:os.arch is downloaded
+# yo can omit the :os.arch part, then it will be guessed... but you may know better
+# It copies and creates all in CWD!!!!
+# Pass the files/dirs as absolute values, it should not be that hard
+# It is useful to have JAVA_HOME pointing to some other JDK used to compile and run supporting files
+# otherwise one of the provided JDKs will be duplicated, and used
+# for your own safety, do not run it as root
+#
+# The JDK you are comparing is launched to get various info about itself
+# If you need to compare jdks on different platform then they are for, you need to go manually.
+#######################################################################################################################
+
+## resolve folder of this script, following all symlinks,
+## http://stackoverflow.com/questions/59895/can-a-bash-script-tell-what-directory-its-stored-in
+SCRIPT_SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SCRIPT_SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+  SCRIPT_DIR="$( cd -P "$( dirname "$SCRIPT_SOURCE" )" && pwd )"
+  SCRIPT_SOURCE="$(readlink "$SCRIPT_SOURCE")"
+  # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+  [[ $SCRIPT_SOURCE != /* ]] && SCRIPT_SOURCE="$SCRIPT_DIR/$SCRIPT_SOURCE"
+done
+COMPARE_WAPPER_SCRIPT_DIR="$( cd -P "$( dirname "$SCRIPT_SOURCE" )" && pwd )"
+readonly COMPARE_WAPPER_SCRIPT_DIR
+
+set -euxo pipefail
+
+function processArgs() {
+  set +x
+    if [ ! "$#" -eq 2 ] ; then
+      echo "This script expects exactly two args - tag/dir/archive, two times"
+      echo "eg: compare_builds.sh  /usr/lib/jvm/java-21-openjdk /my/home/my_custom_tarball.tar.xz"
+      echo "eg: compare_builds.sh  /my/custom/dir/with_jdk jdk-21.0.4+7"
+      echo "if the parameter is tag, the temurin jdk of given tag:os.arch is downloaded"
+      echo " yo can omit the :os.arch part, then it will be guessed... but you may know better"
+      echo "It copies and creates all in CWD!!!! $(pwd)"
+      echo "Pass the files/dirs as absolute values, it should not be that hard"
+      echo "It is usefull to have JAVA_HOME pointing to some other JDK used to compile and runn supporting files"
+      echo "otherwise one of the provided jdks will be duplicated, and used"
+      echo "# for your own safety, do not run it as root"
+      exit 1
+    fi
+    JDK1_STRING="${1}"
+    JDK2_STRING="${2}"
+    local r=0
+    initialInfo "${JDK1_STRING}" || r=$?
+    if [ $r -eq 1 ] ; then
+      JDK1_STRING="${JDK1_STRING}:${DECTED_OS}.${DECTED_ARCH}"
+      echo "Using autodetected: $JDK1_STRING"
+    fi
+    local r=0
+    initialInfo "${JDK2_STRING}" || r=$?
+    if [ $r -eq 1 ] ; then
+      JDK2_STRING="${JDK2_STRING}:${DECTED_OS}.${DECTED_ARCH}"
+      echo "Using autodetected: $JDK2_STRING"
+    fi
+    if [ -n "${JAVA_HOME:-}" ] ; then
+      echo "JAVA_HOME is set to ${JAVA_HOME} and will be used as independnet jdk"
+    else
+      if [ -d "${1}"  ] ; then
+         export JAVA_HOME="${1}"
+         echo "JAVA_HOME was set to ${JAVA_HOME} and will be used as independnet jdk"
+      elif [ -d "${2}"  ] ; then
+         export JAVA_HOME="${2}"
+         echo "JAVA_HOME was set to ${JAVA_HOME} and will be used as independnet jdk"
+      else
+        if [ -f "${1}"  ] ; then
+          echo "${1} will be unpacked second times and used as JAVA_HOME."
+        else
+          echo "once ${1} is downloaded, will be unpacked second times and used as JAVA_HOME"
+        fi
+         echo "We recommend to to set JAVA_HOME for next time."
+      fi
+    fi
+  set -x
+}
+
+function detectOsAndArch() {
+  DECTED_OS=linux
+  DECTED_ARCH=$(uname -m)
+  if [ "${DECTED_ARCH}" == "x86_64" ]  ; then
+    DECTED_ARCH=x64
+  fi
+  if uname | grep "CYGWIN" ; then
+    DECTED_OS=windows
+  fi
+  echo "${DECTED_OS}.${DECTED_ARCH}"
+}
+
+function initialInfo() {
+  if [ -d "${1}" ] ; then
+    echo "${1} is directory, will be copied"
+  elif [ -f "${1}" ] ; then
+    echo "${1} is file, will be unpacked"
+  else
+    echo "${1} is tag:os.arch, will be downloaded and unpacked"
+    # this works only with pipefail
+    if ! echo "${1}" | grep -F . | grep -F : ; then
+      echo -n "it is not tag:os.arch, missing :os.arch? Autodetecting: "
+      detectOsAndArch
+      return 1
+    fi    
+  fi
+  return 0
+}
+
+
+function getReleases() {
+  local mver="${1}"
+  local eaga="${2}"
+  local arch="${3}"
+  local ooss="${4}"
+  curl -sLkX 'GET' \
+  "https://api.adoptium.net/v3/assets/version/${mver}?architecture=${arch}&heap_size=normal&image_type=jdk&jvm_impl=hotspot&os=${ooss}&page=0&page_size=10&project=jdk&release_type=${eaga}&semver=false&sort_method=DEFAULT&sort_order=DESC&vendor=eclipse" \
+  -H 'accept: application/json' |  grep "$5"
+}
+
+function getSurroundingReleases() {
+  local arch="${1}"
+  local ooss="${2}"
+  local pattern="${3}"
+  local human_tag="${4}"
+  local url_tag="${5}"
+  for x in ea ga; do
+    echo "$x [,$human_tag] (so X<=$human_tag) ${arch} ${ooss}"
+    getReleases "%5B%2C${url_tag}%5D" "${x}" "${arch}" "${ooss}" "${pattern}"
+    echo "$x [$human_tag,] (so X>=$human_tag) ${arch} ${ooss}"
+    getReleases "%5B${url_tag}%2C%5D" "${x}" "${arch}" "${ooss}" "${pattern}"
+  done
+}
+
+function initWindowsTools() {
+  set +u
+    if [ -z "${MSBASE_PATH}" ] ; then
+      MSBASE_PATH="/cygdrive/c/Program Files/Microsoft Visual Studio/"
+    fi
+    test -d "${MSBASE_PATH}"
+    if [ -z "${MSVSC}" ] ; then
+      MSVSC=$(find "$MSBASE_PATH" -type d | grep Hostx64/x64$ | head -n 1 )
+    fi
+    test -d "${MSVSC}"
+    if [ -z "${WINKIT}" ] ; then
+      WINKIT=$(dirname "$(find '/cygdrive/c/Program Files (x86)/Windows Kits' | grep  x64/signtool.exe$ | head -n 1)")
+    fi
+    test -d "${WINKIT}"
+    if [ -z "${MSVSCBUILDTOOLS}" ] ; then
+      MSVSCBUILDTOOLS=$(find "$MSBASE_PATH" -type d | grep Auxiliary/Build$ | head -n 1 )
+    fi
+    test -d "${MSVSCBUILDTOOLS}"
+  set -u
+}
+
+function setMsvscToPath() {
+  # should add cl.exe and dumpbin.exe which are necessary to patch binaries
+  export PATH="$MSVSC:$PATH_BACKUP_MSVC"
+  # should add signtool.exe to path to do the same
+  export PATH="$WINKIT:$PATH"
+  export PATH="$FUTURE_PATH_ADDITIONS:$PATH"
+}
+
+function compileAndSetToFuturePath() {
+  pushd "$MSVSCBUILDTOOLS"
+    rm -f WindowsUpdateVsVersionInfo.obj
+    # withotu call, the vcvars64.bat crates subshell (sub cmd)
+    echo "
+      call vcvars64.bat
+      cl $(cygpath -m "${COMPARE_WAPPER_SCRIPT_DIR}/src/c/WindowsUpdateVsVersionInfo.c") version.lib
+    " > setupEnvAndCompile.bat
+    chmod 755 setupEnvAndCompile.bat
+    ./setupEnvAndCompile.bat
+    # copy it to any dir on path or add this dir to path
+    mv WindowsUpdateVsVersionInfo.exe  "$FUTURE_PATH_ADDITIONS"
+    rm WindowsUpdateVsVersionInfo.obj setupEnvAndCompile.bat
+  popd
+}
+
+# on windows/cygwin it is weird
+# shoudl eb needed only on that "third" jdk if copied/extracted
+function chmod777() {
+  local JDK_DIR="${1}"
+  test -f "${JDK_DIR}/bin/java"
+  chmod -R 777 "${JDK_DIR}"
+}
+
+
+function getKeysForComparablePatch() {
+  local JDK_DIR="${1}"
+  set +e
+    JAVA_VENDOR="$("$JDK_DIR/bin/java" -XshowSettings 2>&1| grep 'java.vendor = ' | sed 's/.* = //' | sed 's/\r.*//' )"
+    JAVA_VENDOR_URL="$("$JDK_DIR/bin/java" -XshowSettings 2>&1| grep 'java.vendor.url = ' | sed 's/.* = //' | sed 's/\r.*//')"
+    JAVA_VENDOR_URL_BUG="$("$JDK_DIR/bin/java" -XshowSettings 2>&1| grep 'java.vendor.url.bug = ' | sed 's/.* = //' | sed 's/\r.*//')"
+    JAVA_VENDOR_VERSION="$("$JDK_DIR/bin/java" -XshowSettings 2>&1| grep 'java.vendor.version = ' | sed 's/.* = //' | sed 's/\r.*//')"
+  set -e
+}
+
+function deps() {
+  if uname | grep "CYGWIN" ; then
+    if uname -m | grep "x86_64" ; then
+      echo "Cygwin x86_64"
+      echo "The detection of MS tools is fragile, consider setting up following variables:"
+      echo "MSBASE_PATH  WINKIT  MSVSCBUILDTOOLS and MSVSC"
+    else
+      echo "warning, Cygwin on NOT x86_64 - $(uname -m) - the MSVSC tools are arch dependent. You unless you improve this script, you should set:"
+      echo "MSBADONOT_DEPSSE_PATH  WINKIT  MSVSCBUILDTOOLS and *especially* the  MSVSC variables"
+    fi
+  else
+    if [ "${DO_DEPS:-}" == "true" ] ; then
+      sudo dnf install --skip-broken curl diffutils || echo "unzip/tar already there or windows?"    
+      sudo dnf install --skip-broken unzip tar || echo "unzip/tar already there or windows?"
+    fi
+  fi
+}
+
+function setMainVariables() {
+  PATH_BACKUP_MSVC="$PATH"
+  FUTURE_PATH_ADDITIONS=$(mktemp -d)
+  WORKDIR="$(pwd)"
+  LOG="${WORKDIR}/log.txt"
+  date > "$LOG"
+}
+
+
+# tag:os.arch
+function getTag() {
+  echo "${1%%:*}"
+}
+
+# tag:os.arch
+function getOsArch() {
+  echo "${1##*:}"
+}
+
+# tag:os.arch
+function getOs() {
+  osArch=$(getOsArch "${1}")
+  local osArch="$osArch"
+  echo "${osArch%%.*}"
+}
+
+# tag:os.arch
+function getArch() {
+  osArch=$(getOsArch "${1}")
+  local osArch="$osArch"
+  echo "${osArch##*.}"
+}
+
+function getDiff() {
+  diff -u3 before  after  | grep -v after | grep "^+" | sed "s/^.//" || echo "always $?"  1>&2
+  rm before after
+}
+
+function downloadAdoptiumReleases() {
+  TAG_NON_URL=$(getTag "${1}")
+  TAG=${TAG_NON_URL/+/%2B}
+  ADOPTIUM_ARCH=$(getArch "${1}")
+  OS=$(getOs "${1}")
+  ADOPTIUM_JSON="adoptium.json"
+  local TAG_NON_URL="${TAG_NON_URL}"
+  local TAG="${TAG}"
+  local ADOPTIUM_ARCH="${ADOPTIUM_ARCH}"
+  local OS="${OS}"
+  local ADOPTIUM_JSON="${ADOPTIUM_JSON}"
+  curl -X 'GET' \
+    "https://api.adoptium.net/v3/assets/release_name/eclipse/${TAG}?architecture=${ADOPTIUM_ARCH}&heap_size=normal&image_type=jdk&project=jdk&os=${OS}" \
+    -H 'accept: application/json' > $ADOPTIUM_JSON
+  if [ ! -s $ADOPTIUM_JSON ]; then
+    set +x
+	  echo "AQA api returned nothing! See avaialble versions below"
+      getSurroundingReleases "${ADOPTIUM_ARCH}" "${OS}" '"release_name"' "${TAG_NON_URL}" "${TAG_NON_URL}"
+	  echo "AQA api returned nothing! See avaialble versions above"
+    set -x
+    exit 1
+  fi
+  cat ${ADOPTIUM_JSON}
+  LAST_ADOPTIUM_JSON=${ADOPTIUM_JSON}
+  ls > before
+  curl -OLJSks "https://api.adoptium.net/v3/binary/version/${TAG}/${OS}/${ADOPTIUM_ARCH}/jdk/hotspot/normal/eclipse?project=jdk"
+  ls > after
+  ORIG_LAST_DOWNLOADED_FILE=$(getDiff)
+  local ORIG_LAST_DOWNLOADED_FILE="${ORIG_LAST_DOWNLOADED_FILE}"
+  LAST_DOWNLOADED_FILE="ojdk$(date +%s)_${ORIG_LAST_DOWNLOADED_FILE}"
+  mv "${ORIG_LAST_DOWNLOADED_FILE}" "${LAST_DOWNLOADED_FILE}"
+  if [ ! -e "${LAST_DOWNLOADED_FILE}" ]; then
+    set +x
+	  echo "AQA api downloaded nothing! See avaialble versions below"
+      getSurroundingReleases "${ADOPTIUM_ARCH}" "${OS}" '"link"' "${TAG_NON_URL}" "${TAG_NON_URL}"
+	  echo "AQA api downloaded nothing! See avaialble versions above"
+    set -x
+    exit 1
+  fi
+}
+
+function copyJdk () {
+  local jdk_source="${1}"
+  local jdk_name="${2}"
+  echo "${jdk_source} is directory, will be copied AS ${jdk_name}"
+  readlink -f "${jdk_source}"
+  rm -rf "${jdk_name}"
+  cp -rL "${jdk_source}" "${jdk_name}"
+}
+
+function unpackJdk() {
+  local jdk_source="${1}"
+  local jdk_name="${2}"
+  echo "${jdk_source} is file, will be unpacked and moved *as* ${jdk_name}"
+  readlink -f "${jdk_source}"
+  ls > before
+  if echo "${jdk_source}" | grep "\.zip" ; then
+    unzip "${jdk_source}"
+  else
+    tar -xf "${jdk_source}"
+  fi
+  ls > after
+  unpacked=$(getDiff)
+  local unpacked=${unpacked}
+  rm -rf "${jdk_name}"
+  mv "${unpacked}" "${jdk_name}"
+}
+
+function prepareAlternateJavaHome() {
+  local tag_os_arch="${1}"
+  local existing_archive="${2}"
+  futur_java_home="future_boot_jdk"
+  if [ -e "${futur_java_home}" ] ; then
+    rm -rf "${futur_java_home}"
+  fi
+  if [ -f "${existing_archive}" ] ; then
+    echo "${tag_os_arch} is there as ${existing_archive}, will be reused"
+    unpackJdk "${existing_archive}" "${futur_java_home}"
+  else
+    echo "${tag_os_arch} is tag:os.arch, will be downloaded and unpacked"
+    downloadAdoptiumReleases "${tag_os_arch}"
+    unpackJdk "${LAST_DOWNLOADED_FILE}" "${futur_java_home}"
+  fi
+  if uname | grep CYGWIN ; then
+    chmod777 "${futur_java_home}"
+  fi
+  JAVA_HOME=$(readlink -f "${futur_java_home}");
+  export JAVA_HOME="${JAVA_HOME}"
+}
+
+function tapsAndJunits() {
+  local diffFileParam="${1}"
+  local differencesFile="${2}"
+  local totalFile="${3}"
+  if [ ! "${DO_RESULTS:-}" == "false" ] ; then
+    if [ -z "${RFAT:-}" ] ; then
+      if [ ! -e run-folder-as-tests ] ; then
+        git clone "https://github.com/rh-openjdk/run-folder-as-tests.git"
+      fi
+      RFAT="$(pwd)/run-folder-as-tests"
+    fi
+    # shellcheck disable=SC1091
+    source "${RFAT}/jtreg-shell-xml.sh"
+    # shellcheck disable=SC1091
+    source "${RFAT}/tap-shell-tap.sh"
+    resultsTapFile="${WORKDIR}/compare-comparable-builds.tap"
+    unitFile="compare-comparable-builds.jtr.xml"
+    unitFileArchive="$unitFile.tar.xz"
+    set +x
+    echo "writing $unitFileArchive"
+    local total=4
+    local passed=0
+    local failed=0
+    if [ $GLOABL_RESULT -eq 0 ] ; then
+      passed=$(("${passed}"+1))
+    else
+       failed=$(("${failed}"+1))
+    fi
+    local totalDiffs
+    # warning, this do not work without pipefail
+    totalDiffs=$(grep "Number of" "${differencesFile}" | sed "s/[^0-9]\+//" || echo "999999999") # if there is no record we need to fail
+    local totalFiles
+    totalFiles=$(grep "Number of" "${totalFile}" | sed "s/[^0-9]\+//" || echo "0") # if there is no record we need to fail
+    local totalOnlyIn
+    totalOnlyIn=$(grep "Only in:" "${differencesFile}"| sed "s/[^0-9]\+//" || echo "0") #if there is non, we eant to pass
+    if [ "${totalDiffs}" -eq 0 ] ; then
+      passed=$(("${passed}"+1))
+    else
+      failed=$(("${failed}"+1))
+    fi
+    if [ "${totalFiles}" -ne 0 ] ; then
+      passed=$(("${passed}"+1))
+    else
+      failed=$(("${failed}"+1))
+    fi
+    if [ "${totalOnlyIn}" -eq 0 ] ; then
+      passed=$(("${passed}"+1))
+    else
+      failed=$(("${failed}"+1))
+    fi
+    total=$(("${passed}"+"${failed}"))
+    printXmlHeader "${passed}" "${failed}" "${total}" 0 "compare-comparable-builds" > "${unitFile}"
+    tapHeader "${total}"  "$(date)" > "${resultsTapFile}"
+    if [ "${totalDiffs}" -eq 0 ] ; then
+      printXmlTest "compare" "differences-count" "1" "" "../artifact/$(basename "${differencesFile}")" >> "${unitFile}"
+      tapTestStart "ok" "1" "differences-count" >> "${resultsTapFile}"
+      echo "-- no differences --"
+    else
+      printXmlTest "compare" "differences-count" "1" "${differencesFile}" "../artifact/$(basename "${differencesFile}")" >> "${unitFile}"
+      tapTestStart "not ok" "1" "differences-count" >> "${resultsTapFile}"
+      echo "-- differences count: $totalDiffs --"
+    fi
+    set +e
+      tapFromWholeFile "${differencesFile}" "${differencesFile}" >> "${resultsTapFile}"
+      tapTestEnd >> "${resultsTapFile}"
+    set -e
+    if [ "${totalFiles}" -ne 0 ] ; then
+      printXmlTest "compare" "compared-files-count" "2" "" "../artifact/$(basename "${totalFile}")" >> "${unitFile}"
+      tapTestStart "ok" "2" "compared-files-count" >> "${resultsTapFile}"
+      echo "-- files compared: $totalFiles --"
+    else
+      printXmlTest "compare" "compared-files-count" "2" "${totalFile}" "../artifact/$(basename "${totalFile}")" >> "${unitFile}"
+      tapTestStart "not ok" "2" "compared-files-count" >> "${resultsTapFile}"
+      echo "-- no files compared --"
+    fi
+    set +e
+      tapFromWholeFile "${totalFile}" "${totalFile}" >> "${resultsTapFile}"
+      tapTestEnd >> "${resultsTapFile}"
+    set -e
+    if [ "${totalOnlyIn}" -eq 0 ] ; then
+      printXmlTest "compare" "onlyin-count" "3" "" "../artifact/$(basename "${differencesFile}")" >> "${unitFile}"
+      tapTestStart "ok" "3" "onlyin-count" >> "${resultsTapFile}"
+      echo "-- no onlyin files --"
+    else
+      printXmlTest "compare" "onlyin-count" "3" "${differencesFile}" "../artifact/$(basename "${differencesFile}")" >> "${unitFile}"
+      tapTestStart "not ok" "3" "onlyin-count" >> "${resultsTapFile}"
+      echo "-- onlyin files count: $totalOnlyIn --"
+    fi
+    set +e
+      tapFromWholeFile "${differencesFile}" "${differencesFile}" >> "${resultsTapFile}"
+      tapTestEnd >> "${resultsTapFile}"
+    set -e
+    if [ $GLOABL_RESULT -eq 0 ] ; then
+      printXmlTest "compare" "comparable-builds" "4" "" "../artifact/$(basename "${diffFileParam}")" >> "${unitFile}"
+      tapTestStart "ok" "4" "comparable-builds" >> "${resultsTapFile}"
+      echo "-- COMPARABLE --"
+    else
+      printXmlTest "compare" "comparable-builds" "4" "${diffFileParam}" "../artifact/$(basename "${diffFileParam}")" >> "${unitFile}"
+      tapTestStart "not ok" "4" "comparable-builds" >> "${resultsTapFile}"
+      echo "-- MISMATCH --"
+    fi
+    set +e
+      # shellcheck disable=SC2002
+      cat "${diffFileParam}" | sed "s|${WORKDIR}||g" > diffFileCopy || true
+      tapFromWholeFile "diffFileCopy" "reprotest.diff" >> "${resultsTapFile}"
+      tapTestEnd >> "${resultsTapFile}"
+    set -e
+    printXmlFooter >> "${unitFile}"
+    set -x
+    tar -cJf "${WORKDIR}/${unitFileArchive}"  "${unitFile}"
+  else
+    ls "${diffFileParam}"
+    cat "${diffFileParam}"
+  fi
+}
+
+###################### run ######################
+
+processArgs "$@"
+setMainVariables
+deps
+
+declare -A JDK_INFO
+  JDK_INFO["first_source"]="${JDK1_STRING}"
+  JDK_INFO["second_source"]="${JDK2_STRING}"
+  JDK_INFO["first_id"]=$(basename "$(readlink -f "${JDK1_STRING}")")
+  JDK_INFO["second_id"]=$(basename "$(readlink -f "${JDK2_STRING}")")
+  JDK_INFO["first_tagonly"]="$(getTag "${JDK_INFO["first_id"]}")"
+  JDK_INFO["second_tagonly"]="$(getTag "${JDK_INFO["second_id"]}")"
+  # java do not work if there is colon in its dir!
+  JDK_INFO["first_name"]=$(echo "${JDK_INFO["first_id"]}-ours" | sed "s/:/_/")
+  JDK_INFO["second_name"]=$(echo "${JDK_INFO["second_id"]}-theirs" | sed "s/:/_/")
+  JDK_INFO["first_json"]="adoptium1.json"
+  JDK_INFO["second_json"]="adoptium2.json"
+
+for id in "first" "second" ; do
+  JDK_ID="${JDK_INFO["${id}_id"]}"  
+  JDK_SOURCE="${JDK_INFO["${id}_source"]}"
+  JDK_NAME="${JDK_INFO["${id}_name"]}"
+  JDK_JSON="${JDK_INFO["${id}_json"]}"
+
+  echo "Processing $id: ${JDK_SOURCE} (${JDK_ID})"
+  if [ -d "${JDK_SOURCE}" ] ; then
+    copyJdk "${JDK_SOURCE}" "${JDK_NAME}"
+  elif [ -f "${JDK_SOURCE}" ] ; then
+    unpackJdk "${JDK_SOURCE}" "${JDK_NAME}"
+  else
+    echo "${JDK_SOURCE} is tag:os.arch, will be downloaded and unpacked"
+    downloadAdoptiumReleases "${JDK_ID}"
+    mv "${LAST_ADOPTIUM_JSON}" "${JDK_JSON}"
+    unpackJdk "${LAST_DOWNLOADED_FILE}" "${JDK_NAME}"
+  fi
+  ls -l "$(pwd)"
+
+  if [ -z "${JAVA_HOME:-}" ] && [ "${id}" = "first" ] ; then
+    prepareAlternateJavaHome "${JDK_ID}" "${LAST_DOWNLOADED_FILE}"
+  fi
+done
+
+if uname | grep CYGWIN ; then
+  initWindowsTools
+  setMsvscToPath
+  compileAndSetToFuturePath
+fi
+
+# comapre build can not run if not run from its pwd
+pushd "${COMPARE_WAPPER_SCRIPT_DIR}/reproducible/"
+  for jdkName in ${JDK_INFO["first_name"]} ${JDK_INFO["second_name"]} ; do
+    # better to try them asap
+    "${WORKDIR}/${jdkName}/bin/java" --version 
+    "${WORKDIR}/${jdkName}/bin/javac" --version
+    ftureDir="$(mktemp -d)/classes"
+    if uname | grep CYGWIN ; then
+      ftureDir=$(cygpath -m "${ftureDir}")
+    fi
+    # the java in java_home will be used later, try it
+    "$JAVA_HOME/bin/java" --version
+    "$JAVA_HOME/bin/javac" -d "${ftureDir}" "../../tooling/src/java/temurin/tools/BinRepl.java"
+    CLASSPATH="${ftureDir}"
+    export CLASSPATH
+    if uname | grep CYGWIN ; then
+      CLASSPATH=$(cygpath -m "${CLASSPATH}")
+      export CLASSPATH="${CLASSPATH}"
+    fi
+    getKeysForComparablePatch "${WORKDIR}/${jdkName}"
+    # we cannot use the JDK we are currently processing. It is broken by the patching
+    PATH="${JAVA_HOME}/bin:${PATH}" bash ./comparable_patch.sh --jdk-dir "${WORKDIR}/${jdkName}" --version-string "$JAVA_VENDOR_VERSION" --vendor-name "$JAVA_VENDOR" --vendor_url "$JAVA_VENDOR_URL" --vendor-bug-url "$JAVA_VENDOR_URL_BUG" --vendor-vm-bug-url "$JAVA_VENDOR_URL_BUG"  2>&1 | tee -a "$LOG"
+  done
+  if [ "${DO_BREAK:-}" == "true" ] ; then
+    echo "dead" > "${WORKDIR}/${JDK_INFO["first_name"]}/bin/java"
+    echo "dead" > "${WORKDIR}/${JDK_INFO["first_name"]}/lib/server/libjvm.so"
+  fi
+  GLOABL_RESULT=0
+  bash ./repro_compare.sh openjdk "${WORKDIR}/${JDK_INFO["first_name"]}" openjdk "${WORKDIR}/${JDK_INFO["second_name"]}" 2>&1 | tee -a "${LOG}" || GLOABL_RESULT=$?
+  diflog="${WORKDIR}/differences.log"
+  totlog="${WORKDIR}/totalfiles.log"
+  set +e
+    {
+      grep "Number of differences" -A 1 "${LOG}"
+      echo "Warning, the files which are only in one of the JDKs may be missing in this summary:"
+      grep "Only in" "${LOG}" | sed "s|${WORKDIR}||g"
+      echo -n "Only in: "
+      ## shellcheck disable=SC2126
+      grep -c "Only in " "${LOG}"
+    } > "${diflog}"
+    grep "Number of files" "${LOG}" > "${totlog}"
+  set -e
+popd
+
+diffFile="${COMPARE_WAPPER_SCRIPT_DIR}/reproducible/reprotest.diff"
+tapsAndJunits "${diffFile}" "${diflog}" "${totlog}"
+cp "${diffFile}" "${WORKDIR}"
+pwd
+ls -l "$(pwd)"
+
+if [ ! "${DO_RESULTS:-}" == "false" ] ; then
+  # the result will be changed via tap plugin or jtreg plugin
+  exit 0
+else
+  exit ${GLOABL_RESULT}
+fi