CMake: Improve to support build type. Default to release.

CMakeLists.txt

@@ -2,5 +2,14 @@ cmake_minimum_required(VERSION 2.8)
 
 set(ASMJIT_STATIC TRUE)
 
+if (NOT CMAKE_BUILD_TYPE)
+	message(STATUS "No build type selected, default to Release")
+	set(CMAKE_BUILD_TYPE "Release")
+endif()
+
+if(NOT CMAKE_SIZEOF_VOID_P EQUAL 8)
+	message( FATAL_ERROR "RPCS3 can only be compiled on 64-bit platforms." )
+endif()
+
 add_subdirectory( asmjit )
 add_subdirectory( rpcs3 )