Add initial support for cross-building to iOS

Tested locally with the following configurations:
- iOS device builds (arm64)
- iOS simulator builds (x86_64)
- iOS simulator_and_device builds (fat arm64 and x86_64 archives)

All iOS builds currently require a custom vcpkg fork which contains
fixes for building the required 3rd party libraries.

qtsvg, qtdeclarative, qtgraphicaleffects and qtquickcontrols2
have also been tested to build successfully.

simulator_and_device builds are also supported, but require an umerged
patch in upstream CMake as well as further patches to vcpkg.

Task-number: QTBUG-75576
Change-Id: Icd29913fbbd52a60e07ea5253fd9c7af7f8ce44c
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Qt CMake Build Bot
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/plugins/platforms/ios/.prev_CMakeLists.txt b/src/plugins/platforms/ios/.prev_CMakeLists.txt
new file mode 100644
index 0000000000..f23cf8c300
--- /dev/null
+++ b/src/plugins/platforms/ios/.prev_CMakeLists.txt
@@ -0,0 +1,81 @@
+# Generated from ios.pro.
+
+#####################################################################
+## qios Plugin:
+#####################################################################
+
+add_qt_plugin(qios
+    TYPE platforms
+    CLASS_NAME QIOSIntegrationPlugin
+    SOURCES
+        plugin.mm
+        qiosapplicationdelegate.h qiosapplicationdelegate.mm
+        qiosapplicationstate.h qiosapplicationstate.mm
+        qiosbackingstore.h qiosbackingstore.mm
+        qioscontext.h qioscontext.mm
+        qioseventdispatcher.h qioseventdispatcher.mm
+        qiosglobal.h qiosglobal.mm
+        qiosinputcontext.h qiosinputcontext.mm
+        qiosintegration.h qiosintegration.mm
+        qiosplatformaccessibility.h qiosplatformaccessibility.mm
+        qiosscreen.h qiosscreen.mm
+        qiosservices.h qiosservices.mm
+        qiostextresponder.h qiostextresponder.mm
+        qiostheme.h qiostheme.mm
+        qiosviewcontroller.h qiosviewcontroller.mm
+        qioswindow.h qioswindow.mm
+        quiaccessibilityelement.h quiaccessibilityelement.mm
+        quiview.h quiview.mm
+    LIBRARIES
+        Qt::ClipboardSupportPrivate
+        Qt::CorePrivate
+        Qt::FontDatabaseSupportPrivate
+        Qt::GraphicsSupportPrivate
+        Qt::GuiPrivate
+    PUBLIC_LIBRARIES
+        ${FWAudioToolbox}
+        ${FWFoundation}
+        ${FWQuartzCore}
+        ${FWUIKit}
+        Qt::ClipboardSupport
+        Qt::Core
+        Qt::FontDatabaseSupport
+        Qt::GraphicsSupport
+        Qt::Gui
+)
+
+#### Keys ignored in scope 2:.:.:kernel.pro:<TRUE>:
+# OTHER_FILES = "quiview_textinput.mm" "quiview_accessibility.mm"
+# PLUGIN_CLASS_NAME = "QIOSIntegrationPlugin"
+# PLUGIN_TYPE = "platforms"
+# _LOADED = "qt_plugin"
+
+## Scopes:
+#####################################################################
+
+#### Keys ignored in scope 3:.:.:kernel.pro:QT_FEATURE_shared:
+# CONFIG = "static"
+
+extend_target(qios CONDITION NOT APPLE_TVOS
+    SOURCES
+        qiosclipboard.h qiosclipboard.mm
+        qiosfiledialog.h qiosfiledialog.mm
+        qiosmenu.h qiosmenu.mm
+        qiosmessagedialog.h qiosmessagedialog.mm
+        qiostextinputoverlay.h qiostextinputoverlay.mm
+    PUBLIC_LIBRARIES
+        ${FWAssetsLibrary}
+)
+
+#### Keys ignored in scope 5:.:.:kernel.pro:NOT TARGET___equals____ss_QT_DEFAULT_QPA_PLUGIN:
+# PLUGIN_EXTENDS = "-"
+add_subdirectory(optional)
+
+    if(QT_FEATURE_shared)
+    endif()
+
+    if(NOT APPLE_TVOS)
+    endif()
+
+    if(NOT TARGET___equals____ss_QT_DEFAULT_QPA_PLUGIN)
+    endif()