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doc: releases: migration-guide: 3.6: Add note on SOURCE macros

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Warn users about the SOURCE macros not being defined globally anymore
and them needed to set them if they need them.

Signed-off-by: Alberto Escolar Piedras <alberto.escolar.piedras@nordicsemi.no>
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Alberto Escolar Piedras 2024-01-29 15:51:19 +01:00 committed by Anas Nashif
parent 7d1b3bc083
commit ed2e7eaefe
1 changed files with 10 additions and 0 deletions
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doc/releases/migration-guide-3.6.rst
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@ -26,6 +26,16 @@ Build System
* The deprecated ``prj_<board>.conf`` Kconfig file support has been removed, projects that use
this should switch to using board Kconfig fragments instead (``boards/<board>.conf``).
* Until now ``_POSIX_C_SOURCE``, ``_XOPEN_SOURCE``, and ``_XOPEN_SOURCE_EXTENDED`` were defined
globally when building for the native (``ARCH_POSIX``) targets, and ``_POSIX_C_SOURCE`` when
building with PicolibC. Since this release, these are set only for the files that need them.
If your library or application needed this, you may start getting an "implicit declaration"
warning for functions whose prototypes are only exposed if one of these is defined.
If so, you can fix it by defining the corresponding macro in your C source file before any
include, or by adding the equivalent of
``target_compile_definitions(app PRIVATE _POSIX_C_SOURCE=200809L)`` to your application
or ``zephyr_library_compile_definitions(_POSIX_C_SOURCE=200809L)`` to your library.
Kernel
======