BUILD_SINGLE_APP is now CMake option

CMakeLists.txt

@@ -33,10 +33,6 @@ if(APPLE)
 	endif()
 endif()
 
-if(APPLE_IOS)
-	set(BUILD_SINGLE_APP 1)
-endif()
-
 ############################################
 #        User-provided options             #
 ############################################
@@ -64,6 +60,7 @@ endif(NOT ${CMAKE_VERSION} VERSION_LESS "3.16.0")
 option(ENABLE_GITVERSION "Enable Version.cpp with Git commit hash" ON)
 option(ENABLE_DEBUG_CONSOLE "Enable debug console for Windows builds" ON)
 option(ENABLE_MULTI_PROCESS_BUILDS "Enable /MP flag for MSVS solution" ON)
+option(BUILD_SINGLE_APP "Builds client and server as single executable" OFF)
 
 # Used for Snap packages and also useful for debugging
 if(NOT APPLE_IOS)
@@ -74,6 +71,10 @@ endif()
 set(PACKAGE_NAME_SUFFIX "" CACHE STRING "Suffix for CPack package name")
 set(PACKAGE_FILE_NAME "" CACHE STRING "Override for CPack package filename")
 
+if(APPLE_IOS AND NOT BUILD_SINGLE_APP)
+	set(BUILD_SINGLE_APP ON)
+endif()
+
 # ERM depends on LUA implicitly
 if(ENABLE_ERM AND NOT ENABLE_LUA)
 	set(ENABLE_LUA ON)