diff --git a/scripts/sstate-diff-machines.sh b/scripts/sstate-diff-machines.sh
new file mode 100755
index 0000000..056aa0a
--- /dev/null
+++ b/scripts/sstate-diff-machines.sh
@@ -0,0 +1,172 @@
+#!/bin/bash
+
+# Used to compare sstate checksums between MACHINES.
+# Execute script and compare generated list.M files.
+# Using bash to have PIPESTATUS variable.
+
+# It's also usefull to keep older sstate checksums
+# to be able to find out why something is rebuilding
+# after updating metadata
+
+# $ diff \
+#     sstate-diff/1349348392/fake-cortexa8/list.M \
+#     sstate-diff/1349348392/fake-cortexa9/list.M \
+#     | wc -l
+# 538
+
+# Then to compare sigdata use something like:
+# $ ls sstate-diff/1349348392/*/armv7a-vfp-neon*/linux-libc-headers/*do_configure*sigdata*
+#   sstate-diff/1349348392/fake-cortexa8/armv7a-vfp-neon-oe-linux-gnueabi/linux-libc-headers/3.4.3-r0.do_configure.sigdata.cb73b3630a7b8191e72fc469c5137025
+#   sstate-diff/1349348392/fake-cortexa9/armv7a-vfp-neon-oe-linux-gnueabi/linux-libc-headers/3.4.3-r0.do_configure.sigdata.f37ada177bf99ce8af85914df22b5a0b
+# $ bitbake-diffsigs stamps.1349348392/*/armv7a-vfp-neon*/linux-libc-headers/*do_configure*sigdata*
+#   basehash changed from 8d0bd67bb1da6f68717760fc3ef43171 to e869fa61426e88e9c30726ba88a1216a
+#   Variable TUNE_CCARGS value changed from  -march=armv7-a     -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 to  -march=armv7-a     -mthumb-interwork -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a9
+
+# Global vars
+tmpdir=
+machines=
+targets=
+default_machines="qemuarm qemux86 qemux86-64"
+default_targets="core-image-base"
+analyze="N"
+
+usage () {
+  cat << EOF
+Welcome to utility to compare sstate checksums between different MACHINEs.
+$0 <OPTION>
+
+Options:
+  -h, --help
+        Display this help and exit.
+
+  --tmpdir=<tmpdir>
+        Specify tmpdir, will use the environment variable TMPDIR if it is not specified.
+        Something like /OE/oe-core/tmp-eglibc (no / at the end).
+
+  --machines=<machines>
+        List of MACHINEs separated by space, will use the environment variable MACHINES if it is not specified.
+        Default value is "qemuarm qemux86 qemux86-64".
+
+  --targets=<targets>
+        List of targets separated by space, will use the environment variable TARGETS if it is not specified.
+        Default value is "core-image-base".
+
+  --analyze
+        Show the differences between MACHINEs. It assumes:
+        * First 2 MACHINEs in --machines parameter have the same TUNE_PKGARCH
+        * Third optional MACHINE has different TUNE_PKGARCH - only native and allarch recipes are compared).
+        * Next MACHINEs are ignored
+EOF
+}
+
+# Print error information and exit.
+echo_error () {
+  echo "ERROR: $1" >&2
+  exit 1
+}
+
+while [ -n "$1" ]; do
+  case $1 in
+    --tmpdir=*)
+      tmpdir=`echo $1 | sed -e 's#^--tmpdir=##' | xargs readlink -e`
+      [ -d "$tmpdir" ] || echo_error "Invalid argument to --tmpdir"
+      shift
+        ;;
+    --machines=*)
+      machines=`echo $1 | sed -e 's#^--machines="*\([^"]*\)"*#\1#'`
+      shift
+        ;;
+    --targets=*)
+      targets=`echo $1 | sed -e 's#^--targets="*\([^"]*\)"*#\1#'`
+      shift
+        ;;
+    --analyze)
+      analyze="Y"
+      shift
+        ;;
+    --help|-h)
+      usage
+      exit 0
+        ;;
+    *)
+      echo "Invalid arguments $*"
+      echo_error "Try '$0 -h' for more information."
+        ;;
+  esac
+done
+
+# tmpdir directory, use environment variable TMPDIR
+# if it was not specified, otherwise, error.
+[ -n "$tmpdir" ] || tmpdir=$TMPDIR
+[ -n "$tmpdir" ] || echo_error "No tmpdir found!"
+[ -d "$tmpdir" ] || echo_error "Invalid tmpdir \"$tmpdir\""
+[ -n "$machines" ] || machines=$MACHINES
+[ -n "$machines" ] || machines=$default_machines
+[ -n "$targets" ] || targets=$TARGETS
+[ -n "$targets" ] || targets=$default_targets
+
+OUTPUT=${tmpdir}/sstate-diff/`date "+%s"`
+declare -i RESULT=0
+
+for M in ${machines}; do
+  [ -d ${tmpdir}/stamps/ ] && find ${tmpdir}/stamps/ -name \*sigdata\* | xargs rm -f
+  mkdir -p ${OUTPUT}/${M}
+  export MACHINE=${M}
+  bitbake -S none ${targets} 2>&1 | tee -a ${OUTPUT}/${M}/log;
+  RESULT+=${PIPESTATUS[0]}
+  if ls ${tmpdir}/stamps/* >/dev/null 2>/dev/null ; then
+    cp -ra ${tmpdir}/stamps/* ${OUTPUT}/${M}
+    find ${OUTPUT}/${M} -name \*sigdata\* | sed "s#${OUTPUT}/${M}/##g" | sort > ${OUTPUT}/${M}/list
+    M_UNDERSCORE=`echo ${M} | sed 's/-/_/g'`
+    sed "s/${M_UNDERSCORE}/MACHINE/g; s/${M}/MACHINE/g" ${OUTPUT}/${M}/list | sort > ${OUTPUT}/${M}/list.M
+    find ${tmpdir}/stamps/ -name \*sigdata\* | xargs rm -f
+  else
+    printf "ERROR: no sigdata files were generated for MACHINE $M in ${tmpdir}/stamps\n";
+  fi
+done
+
+function compareSignatures() {
+  MACHINE1=$1
+  MACHINE2=$2
+  PATTERN="$3"
+  PRE_PATTERN=""
+  [ -n "${PATTERN}" ] || PRE_PATTERN="-v"
+  [ -n "${PATTERN}" ] || PATTERN="MACHINE"
+  for TASK in do_configure.sigdata do_populate_sysroot.sigdata do_package_write_ipk.sigdata; do
+    printf "\n\n === Comparing signatures for task ${TASK} between ${MACHINE1} and ${MACHINE2} ===\n" | tee -a ${OUTPUT}/signatures.${MACHINE2}.${TASK}.log
+    diff ${OUTPUT}/${MACHINE1}/list.M ${OUTPUT}/${MACHINE2}/list.M | grep ${PRE_PATTERN} "${PATTERN}" | grep ${TASK} > ${OUTPUT}/signatures.${MACHINE2}.${TASK}
+    for i in `cat ${OUTPUT}/signatures.${MACHINE2}.${TASK} | sed 's#[^/]*/\([^/]*\)/.*#\1#g' | sort -u | xargs`; do
+      [ -e ${OUTPUT}/${MACHINE1}/*/$i/*${TASK}* ] || echo "INFO: ${i} task ${TASK} doesn't exist in ${MACHINE1}" >&2
+      [ -e ${OUTPUT}/${MACHINE1}/*/$i/*${TASK}* ] || continue
+      [ -e ${OUTPUT}/${MACHINE2}/*/$i/*${TASK}* ] || echo "INFO: ${i} task ${TASK} doesn't exist in ${MACHINE2}" >&2
+      [ -e ${OUTPUT}/${MACHINE2}/*/$i/*${TASK}* ] || continue
+      printf "ERROR: $i different signature for task ${TASK} between ${MACHINE1} and ${MACHINE2}\n";
+      bitbake-diffsigs ${OUTPUT}/${MACHINE1}/*/$i/*${TASK}* ${OUTPUT}/${MACHINE2}/*/$i/*${TASK}*;
+      echo "$i" >> ${OUTPUT}/failed-recipes.log
+      echo
+    done | tee -a ${OUTPUT}/signatures.${MACHINE2}.${TASK}.log
+    # don't create empty files
+    ERRORS=`grep "^ERROR.*" ${OUTPUT}/signatures.${MACHINE2}.${TASK}.log | wc -l`
+    if [ "${ERRORS}" != "0" ] ; then
+      echo "ERROR: ${ERRORS} errors found in ${OUTPUT}/signatures.${MACHINE2}.${TASK}.log"
+      RESULT+=${ERRORS}
+    fi
+  done
+}
+
+function compareMachines() {
+  [ "$#" -ge 2 ] && compareSignatures $1 $2
+  [ "$#" -ge 3 ] && compareSignatures $1 $3 "\(^< all\)\|\(^< x86_64-linux\)\|\(^< i586-linux\)"
+}
+
+if [ "${analyze}" = "Y" ] ; then
+  compareMachines ${machines}
+fi
+
+if [ "${RESULT}" != "0" -a -f ${OUTPUT}/failed-recipes.log ] ; then
+  cat ${OUTPUT}/failed-recipes.log | sort -u >${OUTPUT}/failed-recipes.log.u && mv ${OUTPUT}/failed-recipes.log.u ${OUTPUT}/failed-recipes.log
+  echo "ERROR: ${RESULT} issues were found in these recipes: `cat ${OUTPUT}/failed-recipes.log | xargs`"
+fi
+
+echo "INFO: Output written in: ${OUTPUT}"
+exit ${RESULT}