Index: autotests/CMakeLists.txt
===================================================================
--- autotests/CMakeLists.txt
+++ autotests/CMakeLists.txt
@@ -17,3 +17,13 @@
   kiconloader_benchmark
   kicontheme_unittest
 )
+
+### Test for RCC loading
+
+get_target_property(QT_RCC_EXECUTABLE Qt5::rcc LOCATION)
+add_custom_command(OUTPUT icontheme.rcc
+   COMMAND ${QT_RCC_EXECUTABLE} --binary -o icontheme.rcc ${CMAKE_CURRENT_SOURCE_DIR}/icontheme.qrc
+       DEPENDS icontheme.qrc
+)
+ecm_add_test(kiconloader_rcctest.cpp LINK_LIBRARIES Qt5::Test KF5::IconThemes KF5::WidgetsAddons KF5::ConfigCore)
+add_custom_target(rcctest-rcc ALL DEPENDS icontheme.rcc) # a custom target that is always built
Index: autotests/icontheme.qrc
===================================================================
--- /dev/null
+++ autotests/icontheme.qrc
@@ -0,0 +1,6 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="/index.theme">tiny.theme</file>
+    <file alias="/22x22/appsNoContext/someiconintheme.png">test-22x22.png</file>
+</qresource>
+</RCC>
Index: autotests/kiconloader_rcctest.cpp
===================================================================
--- /dev/null
+++ autotests/kiconloader_rcctest.cpp
@@ -0,0 +1,86 @@
+/* This file is part of the KDE libraries
+    Copyright 2015 Christoph Cullmann <cullmann@kde.org>
+    Copyright 2016 David Faure <faure@kde.org>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Library General Public
+    License as published by the Free Software Foundation; either
+    version 2 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Library General Public License for more details.
+
+    You should have received a copy of the GNU Library General Public License
+    along with this library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+    Boston, MA 02110-1301, USA.
+*/
+
+#include <kiconloader.h>
+#include <kicontheme.h>
+
+#include <QStandardPaths>
+#include <QPixmap>
+#include <QTest>
+
+#include <KSharedConfig>
+#include <KConfigGroup>
+
+// Install icontheme.rcc where KIconThemes will find it.
+// This must be done before QCoreApplication is even created, given the Q_COREAPP_STARTUP_FUNCTION in kiconthemes
+void earlyInit()
+{
+    QStandardPaths::enableTestMode(true);
+    qputenv("XDG_DATA_DIRS", "/doesnotexist"); // ensure hicolor/oxygen/breeze are not found
+    QFile rcc("icontheme.rcc");
+    Q_ASSERT(rcc.exists());
+    QCoreApplication::setApplicationName("myappname"); // for a fixed location on Unix (appname is empty here otherwise)
+    const QString destDir = QStandardPaths::writableLocation(QStandardPaths::AppDataLocation);
+    QDir().mkpath(destDir);
+    const QString dest = destDir + "/icontheme.rcc";
+    QFile::remove(dest);
+    if (!rcc.copy(dest)) {
+        qWarning() << "Error copying to" << dest;
+    }
+}
+Q_CONSTRUCTOR_FUNCTION(earlyInit)
+
+class KIconLoader_RCCThemeTest : public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void testThemeName()
+    {
+        QCOMPARE(QIcon::themeName(), m_internalThemeName);
+    }
+
+    void testQIconFromTheme()
+    {
+        // load icon with Qt API
+        QVERIFY(!QIcon::fromTheme(QStringLiteral("someiconintheme")).isNull());
+    }
+
+    void testKIconLoader()
+    {
+        // Check that direct usage of KIconLoader (e.g. from KToolBar) works
+        QVERIFY(KIconLoader::global()->theme());
+        QCOMPARE(KIconLoader::global()->theme()->internalName(), m_internalThemeName);
+
+        // load icon with KIconLoader API (unlikely to happen in reality)
+        QString path;
+        KIconLoader::global()->loadIcon(QStringLiteral("someiconintheme"), KIconLoader::Desktop, 22,
+                                    KIconLoader::DefaultState, QStringList(),
+                                    &path);
+        QCOMPARE(path, QString(QStringLiteral(":/icons/") + m_internalThemeName + QStringLiteral("/22x22/appsNoContext/someiconintheme.png")));
+
+    }
+private:
+    const QString m_internalThemeName = "kf5_rcc_theme";
+};
+
+QTEST_MAIN(KIconLoader_RCCThemeTest)
+
+#include "kiconloader_rcctest.moc"
Index: autotests/tiny.theme
===================================================================
--- /dev/null
+++ autotests/tiny.theme
@@ -0,0 +1,38 @@
+[Icon Theme]
+Name=Tiny
+Comment=Tiny icon theme
+Hidden=false
+Directories=22x22/actions,22x22/animations,22x22/apps,22x22/mimetypes,22x22/appsNoContext,22x22/appsNoType,22x22/appsNoContextOrType
+Inherits=hicolor
+FollowsColorScheme=true
+
+[22x22/actions]
+Size=22
+Context=Actions
+Type=Threshold
+
+[22x22/animations]
+Size=22
+Context=Animations
+Type=Threshold
+
+[22x22/apps]
+Size=22
+Context=Applications
+Type=Threshold
+
+[22x22/mimetypes]
+Size=22
+Context=MimeTypes
+Type=Threshold
+
+[22x22/appsNoContext]
+Size=22
+Type=Threshold
+
+[22x22/appsNoType]
+Size=22
+Context=MimeTypes
+
+[22x22/appsNoContextOrType]
+Size=22
Index: src/CMakeLists.txt
===================================================================
--- src/CMakeLists.txt
+++ src/CMakeLists.txt
@@ -12,6 +12,9 @@
   kicontheme.cpp
   debug.cpp
 )
+qt5_add_resources(kiconthemes_SRCS
+  hicolor.qrc
+)
 ecm_qt_declare_logging_category(kiconthemes_SRCS HEADER debug.h IDENTIFIER  KICONTHEMES CATEGORY_NAME kf5.kiconthemes)
 
 add_library(KF5IconThemes ${kiconthemes_SRCS})
Index: src/hicolor.qrc
===================================================================
--- /dev/null
+++ src/hicolor.qrc
@@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource>
+    <file alias="icons/hicolor/index.theme">hicolor.theme</file>
+</qresource>
+</RCC>
Index: src/hicolor.theme
===================================================================
--- /dev/null
+++ src/hicolor.theme
@@ -0,0 +1,1836 @@
+[Icon Theme]
+Name=Hicolor
+Comment=Fallback icon theme
+Hidden=true
+Directories=16x16/actions,16x16/animations,16x16/apps,16x16/categories,16x16/devices,16x16/emblems,16x16/emotes,16x16/filesystems,16x16/intl,16x16/mimetypes,16x16/places,16x16/status,16x16/stock/chart,16x16/stock/code,16x16/stock/data,16x16/stock/form,16x16/stock/image,16x16/stock/io,16x16/stock/media,16x16/stock/navigation,16x16/stock/net,16x16/stock/object,16x16/stock/table,16x16/stock/text,22x22/actions,22x22/animations,22x22/apps,22x22/categories,22x22/devices,22x22/emblems,22x22/emotes,22x22/filesystems,22x22/intl,22x22/mimetypes,22x22/places,22x22/status,22x22/stock/chart,22x22/stock/code,22x22/stock/data,22x22/stock/form,22x22/stock/image,22x22/stock/io,22x22/stock/media,22x22/stock/navigation,22x22/stock/net,22x22/stock/object,22x22/stock/table,22x22/stock/text,24x24/actions,24x24/animations,24x24/apps,24x24/categories,24x24/devices,24x24/emblems,24x24/emotes,24x24/filesystems,24x24/intl,24x24/mimetypes,24x24/places,24x24/status,24x24/stock/chart,24x24/stock/code,24x24/stock/data,24x24/stock/form,24x24/stock/image,24x24/stock/io,24x24/stock/media,24x24/stock/navigation,24x24/stock/net,24x24/stock/object,24x24/stock/table,24x24/stock/text,32x32/actions,32x32/animations,32x32/apps,32x32/categories,32x32/devices,32x32/emblems,32x32/emotes,32x32/filesystems,32x32/intl,32x32/mimetypes,32x32/places,32x32/status,32x32/stock/chart,32x32/stock/code,32x32/stock/data,32x32/stock/form,32x32/stock/image,32x32/stock/io,32x32/stock/media,32x32/stock/navigation,32x32/stock/net,32x32/stock/object,32x32/stock/table,32x32/stock/text,36x36/actions,36x36/animations,36x36/apps,36x36/categories,36x36/devices,36x36/emblems,36x36/emotes,36x36/filesystems,36x36/intl,36x36/mimetypes,36x36/places,36x36/status,36x36/stock/chart,36x36/stock/code,36x36/stock/data,36x36/stock/form,36x36/stock/image,36x36/stock/io,36x36/stock/media,36x36/stock/navigation,36x36/stock/net,36x36/stock/object,36x36/stock/table,36x36/stock/text,48x48/actions,48x48/animations,48x48/apps,48x48/categories,48x48/devices,48x48/emblems,48x48/emotes,48x48/filesystems,48x48/intl,48x48/mimetypes,48x48/places,48x48/status,48x48/stock/chart,48x48/stock/code,48x48/stock/data,48x48/stock/form,48x48/stock/image,48x48/stock/io,48x48/stock/media,48x48/stock/navigation,48x48/stock/net,48x48/stock/object,48x48/stock/table,48x48/stock/text,64x64/actions,64x64/animations,64x64/apps,64x64/categories,64x64/devices,64x64/emblems,64x64/emotes,64x64/filesystems,64x64/intl,64x64/mimetypes,64x64/places,64x64/status,64x64/stock/chart,64x64/stock/code,64x64/stock/data,64x64/stock/form,64x64/stock/image,64x64/stock/io,64x64/stock/media,64x64/stock/navigation,64x64/stock/net,64x64/stock/object,64x64/stock/table,64x64/stock/text,72x72/actions,72x72/animations,72x72/apps,72x72/categories,72x72/devices,72x72/emblems,72x72/emotes,72x72/filesystems,72x72/intl,72x72/mimetypes,72x72/places,72x72/status,72x72/stock/chart,72x72/stock/code,72x72/stock/data,72x72/stock/form,72x72/stock/image,72x72/stock/io,72x72/stock/media,72x72/stock/navigation,72x72/stock/net,72x72/stock/object,72x72/stock/table,72x72/stock/text,96x96/actions,96x96/animations,96x96/apps,96x96/categories,96x96/devices,96x96/emblems,96x96/emotes,96x96/filesystems,96x96/intl,96x96/mimetypes,96x96/places,96x96/status,96x96/stock/chart,96x96/stock/code,96x96/stock/data,96x96/stock/form,96x96/stock/image,96x96/stock/io,96x96/stock/media,96x96/stock/navigation,96x96/stock/net,96x96/stock/object,96x96/stock/table,96x96/stock/text,128x128/actions,128x128/animations,128x128/apps,128x128/categories,128x128/devices,128x128/emblems,128x128/emotes,128x128/filesystems,128x128/intl,128x128/mimetypes,128x128/places,128x128/status,128x128/stock/chart,128x128/stock/code,128x128/stock/data,128x128/stock/form,128x128/stock/image,128x128/stock/io,128x128/stock/media,128x128/stock/navigation,128x128/stock/net,128x128/stock/object,128x128/stock/table,128x128/stock/text,192x192/actions,192x192/animations,192x192/apps,192x192/categories,192x192/devices,192x192/emblems,192x192/emotes,192x192/filesystems,192x192/intl,192x192/mimetypes,192x192/places,192x192/status,192x192/stock/chart,192x192/stock/code,192x192/stock/data,192x192/stock/form,192x192/stock/image,192x192/stock/io,192x192/stock/media,192x192/stock/navigation,192x192/stock/net,192x192/stock/object,192x192/stock/table,192x192/stock/text,256x256/actions,256x256/animations,256x256/apps,256x256/categories,256x256/devices,256x256/emblems,256x256/emotes,256x256/filesystems,256x256/intl,256x256/mimetypes,256x256/places,256x256/status,256x256/stock/chart,256x256/stock/code,256x256/stock/data,256x256/stock/form,256x256/stock/image,256x256/stock/io,256x256/stock/media,256x256/stock/navigation,256x256/stock/net,256x256/stock/object,256x256/stock/table,256x256/stock/text,512x512/actions,512x512/animations,512x512/apps,512x512/categories,512x512/devices,512x512/emblems,512x512/emotes,512x512/filesystems,512x512/intl,512x512/mimetypes,512x512/places,512x512/status,512x512/stock/chart,512x512/stock/code,512x512/stock/data,512x512/stock/form,512x512/stock/image,512x512/stock/io,512x512/stock/media,512x512/stock/navigation,512x512/stock/net,512x512/stock/object,512x512/stock/table,512x512/stock/text,scalable/actions,scalable/animations,scalable/apps,scalable/categories,scalable/devices,scalable/emblems,scalable/emotes,scalable/filesystems,scalable/intl,scalable/mimetypes,scalable/places,scalable/status,scalable/stock/chart,scalable/stock/code,scalable/stock/data,scalable/stock/form,scalable/stock/image,scalable/stock/io,scalable/stock/media,scalable/stock/navigation,scalable/stock/net,scalable/stock/object,scalable/stock/table,scalable/stock/text,symbolic/apps
+
+
+[16x16/actions]
+Size=16
+Context=Actions
+Type=Threshold
+
+[16x16/animations]
+Size=16
+Context=Animations
+Type=Threshold
+
+[16x16/apps]
+Size=16
+Context=Applications
+Type=Threshold
+
+[16x16/categories]
+Size=16
+Context=Categories
+Type=Threshold
+
+[16x16/devices]
+Size=16
+Context=Devices
+Type=Threshold
+
+[16x16/emblems]
+Size=16
+Context=Emblems
+Type=Threshold
+
+[16x16/emotes]
+Size=16
+Context=Emotes
+Type=Threshold
+
+[16x16/filesystems]
+Size=16
+Context=FileSystems
+Type=Threshold
+
+[16x16/intl]
+Size=16
+Context=International
+Type=Threshold
+
+[16x16/mimetypes]
+Size=16
+Context=MimeTypes
+Type=Threshold
+
+[16x16/places]
+Size=16
+Context=Places
+Type=Threshold
+
+[16x16/status]
+Size=16
+Context=Status
+Type=Threshold
+
+[16x16/stock/chart]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/code]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/data]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/form]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/image]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/io]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/media]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/navigation]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/net]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/object]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/table]
+Size=16
+Context=Stock
+Type=Threshold
+
+[16x16/stock/text]
+Size=16
+Context=Stock
+Type=Threshold
+
+[22x22/actions]
+Size=22
+Context=Actions
+Type=Threshold
+
+[22x22/animations]
+Size=22
+Context=Animations
+Type=Threshold
+
+[22x22/apps]
+Size=22
+Context=Applications
+Type=Threshold
+
+[22x22/categories]
+Size=22
+Context=Categories
+Type=Threshold
+
+[22x22/devices]
+Size=22
+Context=Devices
+Type=Threshold
+
+[22x22/emblems]
+Size=22
+Context=Emblems
+Type=Threshold
+
+[22x22/emotes]
+Size=22
+Context=Emotes
+Type=Threshold
+
+[22x22/filesystems]
+Size=22
+Context=FileSystems
+Type=Threshold
+
+[22x22/intl]
+Size=22
+Context=International
+Type=Threshold
+
+[22x22/mimetypes]
+Size=22
+Context=MimeTypes
+Type=Threshold
+
+[22x22/places]
+Size=22
+Context=Places
+Type=Threshold
+
+[22x22/status]
+Size=22
+Context=Status
+Type=Threshold
+
+[22x22/stock/chart]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/code]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/data]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/form]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/image]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/io]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/media]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/navigation]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/net]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/object]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/table]
+Size=22
+Context=Stock
+Type=Threshold
+
+[22x22/stock/text]
+Size=22
+Context=Stock
+Type=Threshold
+
+[24x24/actions]
+Size=24
+Context=Actions
+Type=Threshold
+
+[24x24/animations]
+Size=24
+Context=Animations
+Type=Threshold
+
+[24x24/apps]
+Size=24
+Context=Applications
+Type=Threshold
+
+[24x24/categories]
+Size=24
+Context=Categories
+Type=Threshold
+
+[24x24/devices]
+Size=24
+Context=Devices
+Type=Threshold
+
+[24x24/emblems]
+Size=24
+Context=Emblems
+Type=Threshold
+
+[24x24/emotes]
+Size=24
+Context=Emotes
+Type=Threshold
+
+[24x24/filesystems]
+Size=24
+Context=FileSystems
+Type=Threshold
+
+[24x24/intl]
+Size=24
+Context=International
+Type=Threshold
+
+[24x24/mimetypes]
+Size=24
+Context=MimeTypes
+Type=Threshold
+
+[24x24/places]
+Size=24
+Context=Places
+Type=Threshold
+
+[24x24/status]
+Size=24
+Context=Status
+Type=Threshold
+
+[24x24/stock/chart]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/code]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/data]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/form]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/image]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/io]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/media]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/navigation]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/net]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/object]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/table]
+Size=24
+Context=Stock
+Type=Threshold
+
+[24x24/stock/text]
+Size=24
+Context=Stock
+Type=Threshold
+
+[32x32/actions]
+Size=32
+Context=Actions
+Type=Threshold
+
+[32x32/animations]
+Size=32
+Context=Animations
+Type=Threshold
+
+[32x32/apps]
+Size=32
+Context=Applications
+Type=Threshold
+
+[32x32/categories]
+Size=32
+Context=Categories
+Type=Threshold
+
+[32x32/devices]
+Size=32
+Context=Devices
+Type=Threshold
+
+[32x32/emblems]
+Size=32
+Context=Emblems
+Type=Threshold
+
+[32x32/emotes]
+Size=32
+Context=Emotes
+Type=Threshold
+
+[32x32/filesystems]
+Size=32
+Context=FileSystems
+Type=Threshold
+
+[32x32/intl]
+Size=32
+Context=International
+Type=Threshold
+
+[32x32/mimetypes]
+Size=32
+Context=MimeTypes
+Type=Threshold
+
+[32x32/places]
+Size=32
+Context=Places
+Type=Threshold
+
+[32x32/status]
+Size=32
+Context=Status
+Type=Threshold
+
+[32x32/stock/chart]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/code]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/data]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/form]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/image]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/io]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/media]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/navigation]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/net]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/object]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/table]
+Size=32
+Context=Stock
+Type=Threshold
+
+[32x32/stock/text]
+Size=32
+Context=Stock
+Type=Threshold
+
+[36x36/actions]
+Size=36
+Context=Actions
+Type=Threshold
+
+[36x36/animations]
+Size=36
+Context=Animations
+Type=Threshold
+
+[36x36/apps]
+Size=36
+Context=Applications
+Type=Threshold
+
+[36x36/categories]
+Size=36
+Context=Categories
+Type=Threshold
+
+[36x36/devices]
+Size=36
+Context=Devices
+Type=Threshold
+
+[36x36/emblems]
+Size=36
+Context=Emblems
+Type=Threshold
+
+[36x36/emotes]
+Size=36
+Context=Emotes
+Type=Threshold
+
+[36x36/filesystems]
+Size=36
+Context=FileSystems
+Type=Threshold
+
+[36x36/intl]
+Size=36
+Context=International
+Type=Threshold
+
+[36x36/mimetypes]
+Size=36
+Context=MimeTypes
+Type=Threshold
+
+[36x36/places]
+Size=36
+Context=Places
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+
+[scalable/stock/image]
+MinSize=1
+Size=128
+MaxSize=512
+Context=Stock
+Type=Scalable
+
+[scalable/stock/io]
+MinSize=1
+Size=128
+MaxSize=256
+Context=Stock
+Type=Scalable
+
+[scalable/stock/media]
+MinSize=1
+Size=128
+MaxSize=512
+Context=Stock
+Type=Scalable
+
+[scalable/stock/navigation]
+MinSize=1
+Size=128
+MaxSize=256
+Context=Stock
+Type=Scalable
+
+[scalable/stock/net]
+MinSize=1
+Size=128
+MaxSize=512
+Context=Stock
+Type=Scalable
+
+[scalable/stock/object]
+MinSize=1
+Size=128
+MaxSize=256
+Context=Stock
+Type=Scalable
+
+[scalable/stock/table]
+MinSize=1
+Size=128
+MaxSize=512
+Context=Stock
+Type=Scalable
+
+[scalable/stock/text]
+MinSize=1
+Size=128
+MaxSize=256
+Context=Stock
+Type=Scalable
+
+[symbolic/apps]
+MinSize=8
+Size=16
+MaxSize=512
+Context=Applications
+Type=Scalable
Index: src/kicontheme.cpp
===================================================================
--- src/kicontheme.cpp
+++ src/kicontheme.cpp
@@ -25,19 +25,51 @@
 
 #include <qplatformdefs.h>
 
+#include <QCoreApplication>
 #include <QAction>
 #include <QtCore/QMap>
 #include <QtCore/QSet>
 #include <QtCore/QFileInfo>
 #include <QtCore/QDir>
 #include <QDebug>
+#include <QResource>
 
 #include <klocalizedstring.h> // KLocalizedString::localizedFilePath. Need such functionality in, hmm, QLocale? QStandardPaths?
 
 #include <ksharedconfig.h>
 
 #include <kconfiggroup.h>
 
+Q_GLOBAL_STATIC(QString, _themeOverride)
+
+// Support for icon themes in RCC files.
+// The intended use case is standalone apps on Windows / MacOS / etc.
+// For this reason we use AppDataLocation: BINDIR/data on Windows, Resources on OS X
+void initRCCIconTheme()
+{
+    const QString iconThemeRcc = QStandardPaths::locate(QStandardPaths::AppDataLocation, QStringLiteral("icontheme.rcc"));
+    if (!iconThemeRcc.isEmpty()) {
+        const QString iconThemeName = QStringLiteral("kf5_rcc_theme");
+        const QString iconSubdir = QStringLiteral("/icons/") + iconThemeName;
+        if (QResource::registerResource(iconThemeRcc, iconSubdir)) {
+            if (QFileInfo::exists(QLatin1Char(':') + iconSubdir + QStringLiteral("/index.theme"))) {
+                // Tell Qt about the theme
+                // Note that since qtbase commit a8621a3f8, this means the QPA (i.e. KIconLoader) will NOT be used.
+                QIcon::setThemeName(iconThemeName); // Qt looks under :/icons automatically
+                // Tell KIconTheme about the theme, in case KIconLoader is used directly
+                *_themeOverride() = iconThemeName;
+            } else {
+                qWarning() << "No index.theme found in" << iconThemeRcc;
+                QResource::unregisterResource(iconThemeRcc, iconSubdir);
+            }
+        } else {
+            qWarning() << "Invalid rcc file" << iconThemeRcc;
+        }
+    }
+}
+Q_COREAPP_STARTUP_FUNCTION(initRCCIconTheme)
+
+
 class KIconTheme::KIconThemePrivate
 {
 public:
@@ -56,7 +88,6 @@
     QVector<KIconThemeDir *> mDirs;
     bool followsColorScheme : 1;
 };
-Q_GLOBAL_STATIC(QString, _themeOverride)
 Q_GLOBAL_STATIC(QString, _theme)
 Q_GLOBAL_STATIC(QStringList, _theme_list)