circuitpython/mpy-cross/README.md

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2020-06-03 18:40:05 -04:00
<!--
SPDX-FileCopyrightText: 2014 MicroPython & CircuitPython contributors (https://github.com/adafruit/circuitpython/graphs/contributors)
SPDX-License-Identifier: MIT
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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. For example,
the unix port of MicroPython requires the following:
$ ./mpy-cross -mcache-lookup-bc foo.py
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