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doc/develop/codingstyle.rst: Expand to include CONFIG_IS_ENABLED and PHASE_

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Expand the conditional compilation section to explain when to use
CONFIG_IS_ENABLED rather than IS_ENABLED and provide an example. Next,
note what the PHASE_ macro is supposed to be used for as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
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Tom Rini 2025-04-01 16:55:25 -06:00
parent 0471f8d001
commit fa72470a4e
1 changed files with 19 additions and 0 deletions
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doc/develop/codingstyle.rst
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@ -192,6 +192,25 @@ inside the block, and check it for correctness (syntax, types, symbol
references, etc). Thus, you still have to use an #ifdef if the code inside the references, etc). Thus, you still have to use an #ifdef if the code inside the
block references symbols that will not exist if the condition is not met. block references symbols that will not exist if the condition is not met.
When working with xPL (see :doc:`spl` for more information) we need to take
further care to use the right macro. In the case where a symbol may be
referenced with an xPL-specific Kconfig symbol, use the CONFIG_IS_ENABLED macro
instead, in a similar manner:
.. code-block:: c
if (CONIG_IS_ENABLED(SOMETHING)) {
...
}
When dealing with a Kconfig symbol that has both a normal name and one or more
xPL-prefixed names, the Makefile needs special consideration as well. The
PHASE\_ macro helps us in this situation thusly:
.. code-block:: make
obj-$(CONFIG_$(PHASE_)SOMETHING) += something.o
At the end of any non-trivial #if or #ifdef block (more than a few lines), At the end of any non-trivial #if or #ifdef block (more than a few lines),
place a comment after the #endif on the same line, noting the conditional place a comment after the #endif on the same line, noting the conditional
expression used. For instance: expression used. For instance: