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Setting emit_dent=0 is unnecessary because arriving in that part of the
if-logic will guarantee that emit_dent is already zero.

The block to check indent_top(lex)>0 is unreachable because a newline is
always inserted an the end of the input stream, and hence dedents are
always processed before EOF.

It was a relic from the days of developing the compiler and is no longer
needed, and it's impossible to trigger via a test.

As per discussion in #2449, using write requests instead of read requests
for I2C.scan() seems to support a larger number of devices, especially
ones that are write-only.  Even a read-only I2C device has to implement
writes in order to be able to receive the address of the register to read.

It contains detailed information about writing scripts to run efficiently
on microcontrollers (and other constrained systems).

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.