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cmake: Corrected setting of C++ language standard

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* reverted old faulty mechanism to set different
  standard according to the toolchain
* Using -std=gnu++2b now for both gcc and clang
* Added a build test app to check the C++ standard in IDF
* Updated english docs to reflect the change to C++23
This commit is contained in:
Jakob Hasse
2023-04-28 15:01:15 +08:00
parent 75d00928f5
commit 0244c24c8d
6 changed files with 40 additions and 13 deletions
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docs/en/api-guides/cplusplus.rst
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@@ -132,13 +132,14 @@ ESP-IDF expects the application entry point, ``app_main``, to be defined with C
{
}
.. _cplusplus_designated_initializers:
Designated initializers
^^^^^^^^^^^^^^^^^^^^^^^
Many of the ESP-IDF components use :ref:`configuration structures <api_reference_config_structures>` as arguments to the initialization functions. ESP-IDF examples written in C routinely use `designated initializers <https://en.cppreference.com/w/c/language/struct_initialization>`_ to fill these structures in a readable and a maintainable way.
C and C++ languages have different rules with regards to the designated initializers. For example, C++ language version C++20, currently the default in ESP-IDF, does not support out-of-order designated initialization, nested designated initialization, mixing of designated initializers and regular initializers, and designated initialization of arrays. Therefore, when porting ESP-IDF C examples to C++, some changes to the structure initializers may be necessary. See the `C++ aggregate initialization reference <https://en.cppreference.com/w/cpp/language/aggregate_initialization>`_ for more details.
C and C++ languages have different rules with regards to the designated initializers. For example, C++ language version C++23, currently the default in ESP-IDF, does not support out-of-order designated initialization, nested designated initialization, mixing of designated initializers and regular initializers, and designated initialization of arrays. Therefore, when porting ESP-IDF C examples to C++, some changes to the structure initializers may be necessary. See the `C++ aggregate initialization reference <https://en.cppreference.com/w/cpp/language/aggregate_initialization>`_ for more details.
iostream