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diff --git a/tools/qscxmlc/moc_patches/update_moc.sh b/tools/qscxmlc/moc_patches/update_moc.sh
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+#!/bin/bash
+#
+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: https://www.qt.io/licensing/
+##
+## This file is part of the QtScxml module of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:GPL-EXCEPT$
+## Commercial License Usage
+## Licensees holding valid commercial Qt licenses may use this file in
+## accordance with the commercial license agreement provided with the
+## Software or, alternatively, in accordance with the terms contained in
+## a written agreement between you and The Qt Company. For licensing terms
+## and conditions see https://www.qt.io/terms-conditions. For further
+## information use the contact form at https://www.qt.io/contact-us.
+##
+## GNU General Public License Usage
+## Alternatively, this file may be used under the terms of the GNU
+## General Public License version 3 as published by the Free Software
+## Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+## included in the packaging of this file. Please review the following
+## information to ensure the GNU General Public License requirements will
+## be met: https://www.gnu.org/licenses/gpl-3.0.html.
+##
+## $QT_END_LICENSE$
+##
+############################################################################/
+
+usage() {
+    cat <<EOF >&2
+
+Usage: update_moc [gu] [moc directory]
+
+The moc directory should be qtbase's moc source directory
+(absolute or relative). The script must be run from the directory
+containing the moc files (moc.h et. al).
+
+The script has two modes:
+
+'g' Generates updated patches of the current qtscxml-specific moc
+    changes. Use this when the qtscxml-specific parts in moc files
+    have changed and the patches should be updated accordingly.
+
+'u' Updates the moc from the upstream qtbase moc.
+    This mode gets the applicable qtbase moc files from the provided
+    directory, and updates their qtscxml copies by applying patches to them.
+    If you have not modified qtscxml moc code and just want to update the moc
+    code from upstream, this is the one you should use.
+
+Examples:
+moc_patches/update_moc g ../../../qtbase/src/tools/moc
+moc_patches/update_moc u ../../../qtbase/src/tools/moc
+
+EOF
+    die "$@"
+}
+
+checkFile () {
+    for f
+    do [[ -f "$f" ]] || die "Error: file \"$f\" does not exist."
+    done
+}
+
+warn () { echo "$@" >&2; }
+die () {
+    [[ -h .upstream ]] && rm .upstream
+    warn "$@"
+    exit 1
+}
+
+generate_patch() {
+    echo Generating patches recording how qscxmlc moc differs from upstream.
+
+    # Link the upstream moc files to create a patch file with filepaths
+    # that are independent of the actual used upstream moc location.
+    ln -s "$MOC_DIR" .upstream
+
+    for file in "${FILES[@]}"
+    do
+        checkFile "$file" ".upstream/$file"
+        diff -u ".upstream/$file" "$file" > "moc_patches/$file.patch"
+        echo Generated "moc_patches/$file.patch"
+    done
+    # tidy up
+    rm .upstream
+}
+
+update_moc() {
+    echo Updating qscxmlc moc from upstream by applying saved patches.
+
+    for file in "${FILES[@]}"
+    do
+        checkFile "moc_patches/$file.patch" "$MOC_DIR/$file"
+        echo Patching file: "$file" with "moc_patches/$file.patch"
+        # overwrite the current file from upstream
+        cp "$MOC_DIR/$file" "$file"
+        if patch "$file" "moc_patches/$file.patch"
+        then echo Patched "$file"
+        else warn "Please hand-patch $file; see $file.orig and $file.rej and tidy them away when you are done."
+        fi
+    done
+}
+
+MODE="$1"
+MOC_DIR="$2"
+FILES=( "outputrevision.h" "moc.h" "generator.h" "generator.cpp" )
+
+[[ -f moc_patches/update_moc.sh ]] || usage "Error: script must be run from the tools/qscxmlc/ directory."
+[[ -n "$MOC_DIR" ]] || usage "Error: You did not specify a moc directory."
+[[ -d "$MOC_DIR" ]] || usage "Error: moc directory \"$MOC_DIR\" does not exist."
+
+case "$MODE" in
+    g) generate_patch ;;
+    u) update_moc ;;
+    *) usage "Error: mode \"$MODE\" is not recognized." ;;
+esac
+
+echo Done