Re: [PATCH] Makefile: Convert -Wimplicit-fallthrough=3 to just -Wimplicit-fallthrough for clang

[Joe Perches]

On Sat, 2019-08-10 at 19:04 -0700, Nathan Chancellor wrote:
> On a tangential note, how are you planning on doing the fallthrough
> comment to attribute conversion? The reason I ask is clang does not
> support the comment annotations, meaning that when Nathan Huckleberry's
> patch is applied to clang (which has been accepted [1]), we are going
> to get slammed by the warnings. I just ran an x86 defconfig build at
> 296d05cb0d3c with his patch applied and I see 27673 instances of this
> warning... (mostly coming from some header files so nothing crazy but it
> will be super noisy).
> 
> If you have something to share like a script or patch, I'd be happy to
> test it locally.
> 
> [1]: https://reviews.llvm.org/D64838

Something like this patch:

https://lore.kernel.org/patchwork/patch/1108577/

Maybe use:

#define fallthrough [[fallthrough]]

if the compiler supports that notation