# Version 20.0.0.0 * Compiling and running gem5 with Python 3 is now fully supported. * Compiling and running gem5 with GCC 8 and 9 is now supported. * Scons-based tests have been migrated to the testlib framework. Please consult TESTING.md for more information on how these may be run. * Support for the ALPHA ISA has been dropped. * Memory SimObjects can now be initialized using an image file using the image_file parameter. * The m5 utility has been revamped with a new build system based on scons, tests, and updated and more consistent feature support. * Robust support for marshalling data from a function call inside the simulation to a function within gem5 using a predefined set of rules. * Workload configuration pulled out into its own object, simplifying the System object and making workload configuration more modular and flexible. * Sv39 paging has been added to the RISC-V ISA, bringing gem5 close to running Linux on RISC-V.