Increased the CMake minimum required version to 3.20

Turns out `OUTPUT` for `add_custom_command` requires CMake 3.20. https://cmake.org/cmake/help/latest/command/add_custom_command.html

Signed-off-by: Fabian Sauter <sauter.fabian@mailbox.org>

src/CMakeLists.txt

@@ -1,12 +1,12 @@
 # SPDX-License-Identifier: Apache-2.0
 
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 if(KOMPUTE_OPT_ANDROID_BUILD)
     find_library(android android)
 endif()
 
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 add_library(kompute Algorithm.cpp
     Manager.cpp

src/include/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 # ####################################################
 # Kompute

src/logger/CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 set(LOGGER_SOURCES Logger.cpp)
 

src/shaders/CMakeLists.txt

@@ -1,5 +1,5 @@
 # SPDX-License-Identifier: Apache-2.0
 # ######################
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 add_subdirectory(glsl)

src/shaders/glsl/CMakeLists.txt

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # ######################
-cmake_minimum_required(VERSION 3.14)
+cmake_minimum_required(VERSION 3.20)
 
 # Check if build shaders from source is enabled
 if(KOMPUTE_OPT_BUILD_SHADERS)