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Merge branch 'docs/picolibc-is-default_v6.0' into 'release/v6.0'

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docs: update picolibc as default C library, remove experimental references (v6.0)

See merge request espressif/esp-idf!46549
This commit is contained in:
Marius Vikhammer
2026-03-20 09:21:33 +08:00
parent 1640707473 cf6ab6c186
commit fc00a6d08f
6 changed files with 10 additions and 14 deletions
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docs/en/api-guides/c.rst
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@@ -5,10 +5,10 @@ C Support
ESP-IDF is primarily written in C and provides C APIs. ESP-IDF can use one of the following C Standard Library implementations:
- `Newlib <https://sourceware.org/newlib/>`_ (default)
- `Picolibc <https://keithp.com/picolibc/>`_ (enabled with :ref:`CONFIG_LIBC_PICOLIBC<CONFIG_LIBC_PICOLIBC>` Kconfig option)
- `Picolibc <https://keithp.com/picolibc/>`_ (default)
- `Newlib <https://sourceware.org/newlib/>`_ (enabled with :ref:`CONFIG_LIBC_NEWLIB<CONFIG_LIBC_NEWLIB>` Kconfig option)
The Newlib version is specified in :component_file:`esp_libc/sbom.yml`.
The Picolibc version is specified in :component_file:`esp_libc/sbom_picolibc.yml` and the Newlib version in :component_file:`esp_libc/sbom_newlibc.yml`.
In general, all C features supported by the compiler (currently GCC) can be used in ESP-IDF, unless otherwise noted in :ref:`unsupported_c_features` below.
docs/en/api-guides/performance/ram-usage.rst
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@@ -96,7 +96,7 @@ Reducing Stack Sizes
- Avoid stack heavy functions. String formatting functions (like ``printf()``) are particularly heavy users of the stack, so any task which does not ever call these can usually have its stack size reduced.
- Using experimental :ref:`picolibc-instead-of-newlib` reduces the stack usage of ``printf()`` calls significantly.
- Using :ref:`picolibc-instead-of-newlib` reduces the stack usage of ``printf()`` calls significantly.
- Enabling :ref:`newlib-nano-formatting` reduces the stack usage of any task that calls ``printf()`` or other C string formatting functions.
- Avoid allocating large variables on the stack. In C, any large structures or arrays allocated as an automatic variable (i.e., default scope of a C declaration) uses space on the stack. To minimize the sizes of these, allocate them statically and/or see if you can save memory by dynamically allocating them from the heap only when they are needed.
docs/en/api-guides/performance/size.rst
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@@ -158,12 +158,10 @@ lwIP IPv4
Picolibc instead of Newlib
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By default, ESP-IDF uses the Newlib C library, and it also has experimental support for the Picolibc C library.
By default, ESP-IDF uses the Picolibc C library. Newlib is also supported and can be selected with :ref:`CONFIG_LIBC_NEWLIB<CONFIG_LIBC_NEWLIB>`.
Picolibc C library provides smaller ``printf`` family functions and can reduce the binary size by up to 30 KB, depending on your application.
To switch to linking against the Picolibc C library, please enable the configuration options :ref:`CONFIG_IDF_EXPERIMENTAL_FEATURES` and :ref:`CONFIG_LIBC_PICOLIBC<CONFIG_LIBC_PICOLIBC>`.
.. _newlib-nano-formatting:
Newlib Nano Formatting