Compile in C++20 mode

src/3rdparty/CMakeLists.txt

@@ -15,7 +15,7 @@ ADD_SUBDIRECTORY(weakjack)
 add_library(ringbuffer OBJECT
 	ringbuffer/src/lib/ringbuffer.cpp
 )
-target_compile_features(ringbuffer PUBLIC cxx_std_17)
+target_compile_features(ringbuffer PUBLIC cxx_std_20)
 target_include_directories(ringbuffer PUBLIC
 	ringbuffer/include
 	"${CMAKE_CURRENT_BINARY_DIR}"

src/3rdparty/hiir/CMakeLists.txt

@@ -1,3 +1,3 @@
 add_library(hiir INTERFACE)
 target_include_directories(hiir INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})
-target_compile_features(hiir INTERFACE cxx_std_17)
+target_compile_features(hiir INTERFACE cxx_std_20)

src/CMakeLists.txt

@@ -9,8 +9,8 @@ SET(CMAKE_AUTOMOC ON)
 SET(CMAKE_AUTOUIC ON)
 SET(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
 
-# Enable C++17
-SET(CMAKE_CXX_STANDARD 17)
+# Enable C++20
+SET(CMAKE_CXX_STANDARD 20)
 
 IF(LMMS_BUILD_APPLE AND CMAKE_CXX_COMPILER_ID MATCHES "Clang")
 	SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")