Re: [PATCH 0/5] CodingGuidelines: various C99 updates

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Ævar Arnfjörð Bjarmason  <avarab@xxxxxxxxx> writes:

> This series:
>
>  * Rephrases CodingGuidelines so that we note we're on C99, and then
>    lists exceptions and features we use. The previous prose assumed
>    C89 by default.
>
>    We still explicitly avoid opening the "feel free to use an C99
>    feature" floodgates.

The above contradicts with each other.  A sensible position to
support the "we do not open the floodgate" is that when in doubt
stick to C89 but use C99 features that are explicitly allowed.

>  * Mentions that you can use dynamic C99 initializer elements. See the
>    recent discussion at
>    https://lore.kernel.org/git/221006.86a668r5mf.gmgdl@xxxxxxxxxxxxxxxxxxx/

Good.

>  * Allows us to use "for (int i". I didn't set out to (slightly) jump
>    the gun on this, but just pulling the trigger around ~20 days early
>    makes it easier to ...

This is a welcome change.  As anything this set of patches won't
become reality in any released version until mid December anyway,
this is the cycle to "revisit around November 2022".

>  * ...add the natural follow-up section of C99 features you explicitly
>    shouldn't be using yet, to which I added the two cases I could
>    remember (in 4-5/5).

And we do not have to say we do not use these from C99 if our base
is C89, with explicitly allowed features from C99.




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