r258128 - Add -Wexpansion-to-undefined: warn when using `defined` in a macro definition.

[Diego Novillo via cfe-commits]

On Tue, Jan 19, 2016 at 3:30 PM, Nico Weber <thakis at google.com> wrote:

> I'll take a look. If it's urgent it's also possible to disable this
> warning.
>

Yeah.  I think disabling it by default may be the better choice.  Thanks.
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