Index: utils/analyzer/SATestUpdateDiffs.py
===================================================================
--- /dev/null
+++ utils/analyzer/SATestUpdateDiffs.py
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+
+"""
+Update reference results for static analyzer.
+"""
+
+import SATestBuild as SAB
+
+from subprocess import check_call, check_output, CalledProcessError
+import csv
+import os
+import sys
+
+Verbose = 1
+def runCmd(Command):
+    if Verbose:
+        print "Executing %s" % Command
+    check_call(Command, shell=True)
+
+def updateReferenceResults(ProjName, ProjBuildMode):
+    ProjDir = SAB.getProjectDir(ProjName)
+
+    RefResultsPath = os.path.join(ProjDir,
+            SAB.getSBOutputDirName(IsReferenceBuild=True))
+    CreatedResultsPath = os.path.join(ProjDir,
+            SAB.getSBOutputDirName(IsReferenceBuild=False))
+
+    if not os.path.exists(CreatedResultsPath):
+        print >> sys.stderr, "New results not found, was SATestBuild.py "\
+                             "previously run?"
+        sys.exit(-1)
+
+    # Remove reference results.
+    runCmd("git rm -r '%s'" % (RefResultsPath,))
+
+    # Replace reference results with a freshly computed once.
+    runCmd("cp -r %s %s" % (CreatedResultsPath, RefResultsPath,))
+
+    # Run cleanup script.
+    with open(SAB.getBuildLogPath(RefResultsPath), "wb+") as PBuildLogFile:
+        SAB.runCleanupScript(ProjDir, PBuildLogFile)
+
+    SAB.normalizeReferenceResults(ProjDir, RefResultsPath, ProjBuildMode)
+
+    # Clean up the generated difference results.
+    SAB.cleanupReferenceResults(RefResultsPath)
+
+    # Remove the created .diffs file before adding.
+    runCmd("rm -f %s/*/%s" % (RefResultsPath, SAB.DiffsSummaryFileName))
+
+    runCmd("git add '%s'" % (RefResultsPath,))
+
+def main(argv):
+    if len(argv) == 2 and argv[1] in ('-h', '--help'):
+        print >> sys.stderr, "Update static analyzer reference results based "\
+                             "\non the previous run of SATestBuild.py.\n"
+                             "\nN.B.: Assumes that SATestBuild.py was just run."
+        sys.exit(-1)
+
+    with SAB.projectFileHandler() as f:
+        for (ProjName, ProjBuildMode) in SAB.iterateOverProjects(f):
+            updateReferenceResults(ProjName, int(ProjBuildMode))
+
+if __name__ == '__main__':
+    main(sys.argv)