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doc: releases: Add release notes for picolibc 

Document changes related to Kconfig settings so that users can see how to
adjust their settings for best results with Zephyr 3.6.

Signed-off-by: Keith Packard <keithp@keithp.com>
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Keith Packard 2024-02-15 12:23:30 -08:00 committed by Henrik Brix Andersen
parent 825c4f2080
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doc/releases/release-notes-3.6.rst
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@ -990,6 +990,29 @@ Libraries / Subsystems
With this addition, two zephyr applications can communicate with each other through their
respective ``modem_cmux`` instances.
* Picolibc
* Update to version 1.8.6. This removes the :c:macro:`_POSIX_C_SOURCE` definition from the build
system, so applications will need to add this if they use APIs outside of the Zephyr
requirements.
* Add new :c:func:`printf` modes, :kconfig:option:`CONFIG_PICOLIBC_IO_LONG_LONG` and
:kconfig:option:`CONFIG_PICOLIBC_IO_MINIMAL`. These provide applications with finer grained
control over the level of support provided by the library to control text space usage. By
default, the correct level of support is selected based upon other configuration parameters.
* Add :kconfig:option:`CONFIG_PICOLIBC_ASSERT_VERBOSE`. This option, which is false by default,
controls whether the :c:func:`assert` function displays verbose information, including the file
name, line number, function name and failing expression txt, when the assertion fails. Leaving
this disabled saves text space.
* Allow :kconfig:option:`CONFIG_THREAD_LOCAL_STORAGE` to be disabled while using Picolibc. This is
very helpful in diagnosing issues when using Picolibc as those are often caused by enabling TLS
and not caused by using the library itself.
* Numerous improvements in the library including code-size reductions in areas like printf and
ctype and various fixes in the math library.
* Power management
* Atmel SAM: introduced SUPC functions to allow wakeup sources and poweroff.