Require C++17

CMakeLists.txt

@@ -12,6 +12,10 @@ project(kate VERSION ${RELEASE_SERVICE_VERSION})
 set(QT_MIN_VERSION "5.14.0")
 set(KF5_DEP_VERSION "5.79.0")
 
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+set(CMAKE_CXX_EXTENSIONS OFF)
+
 # We need some parts of the ECM CMake helpers.
 find_package(ECM ${KF5_DEP_VERSION} QUIET REQUIRED NO_MODULE)