[PATCH] build: announce requirement for C11

[Bruce Richardson]

On Wed, May 03, 2023 at 08:35:44AM -0700, Tyler Retzlaff wrote:
> On Wed, May 03, 2023 at 04:14:13PM +0100, Bruce Richardson wrote:
> > Add a deprecation notice informing users that we will require a C11
> > compiler from 23.11 release onwards. This requirement was agreed by
> > technical board to enable use of newer C language features, e.g.
> > standard atomics. [1]
> > 
> > [1] http://inbox.dpdk.org/dev/DBAPR08MB58148CEC3E1454E8848A938998AB9@DBAPR08MB5814.eurprd08.prod.outlook.com/
> > 
> > Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> > ---
> >  doc/guides/rel_notes/deprecation.rst | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
> > index dcc1ca1696..9a391d2c49 100644
> > --- a/doc/guides/rel_notes/deprecation.rst
> > +++ b/doc/guides/rel_notes/deprecation.rst
> > @@ -11,6 +11,12 @@ here.
> >  Deprecation Notices
> >  -------------------
> >  
> > +* C Compiler: From DPDK 23.11 onwards,
> > +  building DPDK will require a C compiler which supports the C11 standard, or later.
> > +  Please note:
> > +     - C11 is supported from GCC version 5 onwards, and is the default language version in that release
> > +     - C11 is the default compilation mode in Clang from version 3.6
> 
> suggest adding an additional qualification that
> 
>   C11 conformant compiler including support for optional standard atomics
> 
>   does NOT #define __STDC_NO_ATOMICS__ 1
> 
>   which requires providing the stdatomic.h header and feature. this
>   shouldn't be contentious since both gcc and clang have support.
>   

Agree, that is good to clarify. I'll wait a while for more feedback and
then do a V2.

> Acked-by: Tyler Retzlaff <roretzla at linux.microsoft.com>
> 
> > +
> >  * kvargs: The function ``rte_kvargs_process`` will get a new parameter
> >    for returning key match count. It will ease handling of no-match case.
> >  
> > -- 
> > 2.39.2