First Commit

3rdparty/kddockwidgets/cmake/ECM/modules/QtVersionOption.cmake

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+# SPDX-FileCopyrightText: 2021 Volker Krause <vkrause@kde.org>
+#
+# SPDX-License-Identifier: BSD-3-Clause
+
+#[=======================================================================[.rst:
+QtVersionOption
+---------------
+
+Adds a build option to select the major Qt version if necessary,
+that is, if the major Qt version has not yet been determined otherwise
+(e.g. by a corresponding ``find_package()`` call).
+This module is typically included by other modules requiring knowledge
+about the major Qt version.
+
+If the ECM version passed to find_package was at least 5.240.0 Qt6 is picked by default.
+Otherwise Qt5 is picked.
+
+``QT_MAJOR_VERSION`` is defined to either be "5" or "6".
+
+Since 5.82.0.
+#]=======================================================================]
+
+if (DEFINED QT_MAJOR_VERSION)
+    return()
+endif()
+
+if (TARGET Qt5::Core)
+    set(QT_MAJOR_VERSION 5)
+elseif (TARGET Qt6::Core)
+    set(QT_MAJOR_VERSION 6)
+else()
+    if (ECM_GLOBAL_FIND_VERSION VERSION_GREATER_EQUAL 5.240)
+        option(BUILD_WITH_QT6 "Build against Qt 6" ON)
+    else()
+        option(BUILD_WITH_QT6 "Build against Qt 6" OFF)
+    endif()
+
+    if (BUILD_WITH_QT6)
+        set(QT_MAJOR_VERSION 6)
+    else()
+        set(QT_MAJOR_VERSION 5)
+    endif()
+endif()