macro __VAR_ARGS_ bug??

[Reza Roboubi]

Neil Booth wrote:
> 
> Here's an alternative version that
> 
> 1) Retains the comma if there is at least 2 macro parameters
> 2) If there is just the variadic parameter, then it retains the
>    comma only in standards-conforming mode (any standard).

This is exactly the right way to do it.

What is the efficient way to do a quick rebuild after making changes
like these to the source tree?  Would you please tell me how you do it?