I wrote:
> It occurs to me that we should now be able to drop configure's
> probe for -Wno-compound-token-split-by-macro, since that was only
> needed to suppress warnings in the Perl headers.
... or not. A bit of experimentation says that they still come out,
apparently because the warnings are triggered by *use* of relevant
Perl macros not by their *definitions*. Oh well.
regards, tom lane