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Adds check that LZ offsets fall into the sliding dictionary used. This
catches a case when uzlib.DecompIO with a smaller dictionary is used
to decompress data which was compressed with a larger dictionary.
Previously, this would lead to producing invalid data or crash, now
an exception will be thrown.

The check for division by zero is made by the caller of this function.

This allows to get/set at runtime the optimisation level of the compiler.

Patch on top of upstream Zephyr console helpers.

The outputexpors target, which exports Zephyr environment variables, was
recently added to Zephyr. By exploiting this feature we can hugely simplify
the build system, improving robustness at the same time.
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

By tricking Zephyt arch Makefiles compute them for us (not just for
Zephyr). This make potentially break as Zephyr evolves.

The two variables, GENERIC_TARGETS and CONFIG_TARGETS come, respectively,
from the the lists shown during "make help" and "make kconfig-help".
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

Currently to compile for anything that except ARCH=x86 we have to
provide ARCH via the environment or make arguments. We can do better
than that!
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>

From https://github.com/pfalcon/zephyr_getchar .

Also, drop deprecated (as for MicroPython) readall() method.

To save iRAM.

Reduces esp8266 code size by about 230 bytes.

This is an often used code pattern, and its use reduces code size of the
core by about 100 bytes.

Added options to make deploy so it can be used for ESP8266 boards with
other flash configurations.  For example NodeMCU DEVKIT V1.0 can now use:

    $ make FLASH_MODE=dio FLASH_SIZE=32m deploy