[wwwdocs] Add various new warnings for GCC 7

Gerald Pfeifer gerald@pfeifer.com
Fri Jan 27 20:39:00 GMT 2017

On Fri, 27 Jan 2017, Jakub Jelinek wrote:
> For -Wregister I think it would be better to write more:
>     <li><code>-Wregister</code> warns about uses of <code>register</code> storage
>           specifier.  In C++17 this keyword has been removed and for C++17
>           this is a pedantic warning enabled by default.  The warning is not
> 	  emitted for the GNU Explicit Register Variables extension.</li>

Is C++17 correct in both cases?  If the register keyword has been 
removed, wouldn't that be an error as opposed to just a warning?


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