CMake: Bump minimum CMake version to 3.20

In order to get the policy CMP0116 set to NEW.

See https://cmake.org/cmake/help/latest/policy/CMP0116.html

This should prevent rebuilds due to AUTOMOC.

Change-Id: I242c44b2969c6caccf61b7d5ba5c3a0335744ee7
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 option(BUILD_DESIGNSTUDIO "Build and install design studio plugins, examples and settings." OFF)
 if (BUILD_DESIGNSTUDIO)

src/libs/qtcreatorcdbext/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake")
 

src/plugins/appstatisticsmonitor/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake")
 

src/tools/qml2puppet/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 # standalone build
 if (NOT QT_CREATOR_API_DEFINED)

src/tools/sdktool/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake")
 

src/tools/wininterrupt/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.16)
+cmake_minimum_required(VERSION 3.20)
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../cmake")