Re: [RFC PATCH] compiler_attributes.h: Add 'fallthrough' pseudo keyword for switch/case use

[Joe Perches]

On Wed, 2019-07-31 at 23:10 -0700, hpa@xxxxxxxxx wrote:
> On July 31, 2019 4:55:47 PM PDT, Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx> wrote:
> > On Wed, Jul 31, 2019 at 11:01 PM <hpa@xxxxxxxxx> wrote:
> > > The standard is moving toward adding this as an attribute with the
> > [[fallthrough]] syntax; it is in C++17, not sure when it will be in C
> > be if it isn't already.
> > 
> > Not yet, but it seems to be coming:
> > 
> >  http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2268.pdf
> > 
> > However, even if C2x gets it, it will be quite a while until the GCC
> > minimum version gets bumped up to that, so...
> > 
> > Cheers,
> > Miguel
> 
> The point was that we should plan ahead in whatever we end up doing.

Using a local keyword will allow any compiler to work successfully.

It's pretty simple to modify this to something like

#define fallback [[fallback]]