Clean up GNU-isms in base?

[Brooks Davis]

On Thu, Jan 16, 2020 at 10:17:26AM +0200, Rares Aioanei wrote:
> While compiling world with extra warnings I noticed compiler messages
> about GNU extensions being used in the code, for example the use of typeof() or
> warnings like this : "/usr/src/lib/libpmc/pmu-events/json.h:22:35:
> warning: token pasting of ',' and __VA_ARGS__ is a GNU extension
> [-Wgnu-zero-variadic-macro-arguments]". Question is : is there an
> interest in doing a "clean-up" of such constructs in the code?

To the extent that the standard provides a useful mechanism (as, IIRC,
it does here), I think this is a good idea.

Right now we're probably confined to mechanisms supported in C99, but
once we've finished kicking gcc 4.2.1 out later this year, we'll be able
to use C11 features.

-- Brooks
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