Cmake force c++ 17

Supercollider uses c++17, not 11.

Author: JordanHendersonMusic

CMakeLists.txt

@@ -69,7 +69,6 @@ option(QUARKS "Install plugins as quarks")
 option(OSX_PACKAGE "Package dmg for Apple")
 option(IN_PLACE_BUILD "Build and install in cmake build folder" ON)
 option(NOVA_SIMD "Build VBAP with nova-simd support." ON)
-option(CPP11 "Build with c++11." ON)
 option(NATIVE "Optimize for this specific machine." OFF)
 option(SYSTEM_STK "Use STK libraries from system" OFF)
 option(HOA_UGENS "Build with HOAUGens (Higher-order Ambisonics)" ON)
@@ -119,12 +118,10 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANG)
 		add_definitions(-march=native)
 	endif()
 
-	if(CPP11)
-        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-		if(CMAKE_COMPILER_IS_CLANG)
-			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
-		endif()
-	endif()
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
+    if(CMAKE_COMPILER_IS_CLANG)
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++")
+    endif()
 endif()
 if(MINGW)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mstackrealign")

README.md

@@ -50,6 +50,8 @@ git clone --recursive https://github.com/supercollider/sc3-plugins.git
 git clone --recursive https://github.com/supercollider/supercollider.git
 ```
 
+Note, if you are building for an older version of supercollider you should checkout the sc3-plugins tag which matches the version of supercollider.
+
 Be sure to use `--recursive`, or to initialize the submodules after cloning, otherwise you will not have files
 that are necessary to build the project.