965c77ade9
This commit adds a new command line switch to inform the RV32 emitter to use Zba opcodes in its output. A new implementation-specific option was introduced, called "-march-flags", that will contain a list of additional architecture-specific flags to pass to the chosen native emitter implementation. At the moment only the RV32 emitter can make use of this command line facility: if the architecture flags string equals to "zba" (case-sensitive), then the native emitter will emit Zba opcodes if it has a chance to do so. At the moment there is no check on whether additional architecture flags using to build a MPY file are compatible with the target the output code is run on, so use this with caution. Signed-off-by: Alessandro Gatti <a.gatti@frob.it>
MicroPython cross compiler
This directory contains the MicroPython cross compiler, which runs under any Unix-like system and compiles .py scripts into .mpy files.
Build it as usual:
$ make
The compiler is called mpy-cross. Invoke it as:
$ ./mpy-cross foo.py
This will create a file foo.mpy which can then be copied to a place accessible
by the target MicroPython runtime (eg onto a pyboard's filesystem), and then
imported like any other Python module using import foo.
Different target runtimes may require a different format of the compiled bytecode, and such options can be passed to the cross compiler.
If the Python code contains @native or @viper annotations, then you must
specify -march to match the target architecture.
Run ./mpy-cross -h to get a full list of options.
The optimisation level is 0 by default. Optimisation levels are detailed in https://docs.micropython.org/en/latest/library/micropython.html#micropython.opt_level