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py/mkrules.mk: Add MICROPY_PREVIEW_VERSION_2.

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This provides a way to enable features and changes slated for MicroPython
2.x, by running `make MICROPY_PREVIEW_VERSION_2=1`. Also supported for
the cmake ports (except Zephyr).

This is an alternative to having a 2.x development branch (or equivalently,
keeping a 1.x release branch). Any feature or change that needs to be
"hidden" until 2.x can use this flag (either in the Makefile or the
preprocessor).

A good example is changing function arguments or other public API features,
in particular to aid in improving consistency between ports.

When `MICROPY_PREVIEW_VERSION_2` is enabled, the REPL banner is amended to
say "MicroPython (with v2.0 preview) vX.Y.Z", and sys.implementation gets a
new field `_v2` set to `True`.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
This commit is contained in:
Jim Mussared
2023-10-10 16:50:28 +11:00
committed by Damien George
parent 3e2706a18d
commit 3bf70f16e9
8 changed files with 85 additions and 11 deletions
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4
ports/esp32/Makefile
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@@ -52,6 +52,10 @@ ifdef BOARD_VARIANT
IDFPY_FLAGS += -D MICROPY_BOARD_VARIANT=$(BOARD_VARIANT)
endif
ifdef MICROPY_PREVIEW_VERSION_2
IDFPY_FLAGS += -D MICROPY_PREVIEW_VERSION_2=1
endif
HELP_BUILD_ERROR ?= "See \033[1;31mhttps://github.com/micropython/micropython/wiki/Build-Troubleshooting\033[0m"
define RUN_IDF_PY