Raise minimum CMake version to 3.16 and cleanup related conditionals

CMake 3.31 warns about compat. for <3.10 being removed in the future.
Qt6 CMake modules already require 3.16 though, and it allows to clean
up existing CMAKE_VERSION conditionals a bit.

CMake 3.16 was released in 2019.

Signed-off-by: Andreas Sturmlechner <[email protected]>

Author: a17r

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.5)
+cmake_minimum_required(VERSION 3.16)
 project(kImageAnnotator LANGUAGES CXX VERSION 0.7.2)
 
 set(CMAKE_CXX_STANDARD 17)
@@ -79,12 +79,7 @@ target_include_directories(kImageAnnotator
 target_link_libraries(kImageAnnotator PUBLIC Qt${QT_MAJOR_VERSION}::Widgets Qt${QT_MAJOR_VERSION}::Svg PRIVATE kColorPicker::kColorPicker)
 
 if (UNIX AND NOT APPLE)
-	# X11::X11 imported target only available with sufficiently new CMake
-	if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.14.0)
-		target_link_libraries(kImageAnnotator PRIVATE X11::X11)
-	else()
-		target_link_libraries(kImageAnnotator PRIVATE X11)
-	endif()
+	target_link_libraries(kImageAnnotator PRIVATE X11::X11)
 endif ()
 
 target_compile_definitions(kImageAnnotator PRIVATE KIMAGEANNOTATOR_LIB)

tests/CMakeLists.txt

@@ -75,12 +75,7 @@ target_link_libraries(KIMAGEANNOTATOR_STATIC
 		Qt${QT_MAJOR_VERSION}::Svg)
 
 if (UNIX AND NOT APPLE)
-	# X11::X11 imported target only available with sufficiently new CMake
-	if (CMAKE_VERSION VERSION_GREATER_EQUAL 3.14.0)
-		target_link_libraries(KIMAGEANNOTATOR_STATIC X11::X11)
-	else()
-		target_link_libraries(KIMAGEANNOTATOR_STATIC X11)
-	endif()
+	target_link_libraries(KIMAGEANNOTATOR_STATIC X11::X11)
 endif ()
 
 target_compile_definitions(KIMAGEANNOTATOR_STATIC PRIVATE KIMAGEANNOTATOR_LANG_INSTALL_DIR="${KIMAGEANNOTATOR_LANG_INSTALL_DIR}")