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

[Nico Weber via cfe-commits]

I mean you could pass a -Wno flag. It's undefined behavior that's actually
causing bugs in practice; it should probably be on by default.
On Jan 19, 2016 3:38 PM, "Diego Novillo" <dnovillo at google.com> wrote:

>
>
> 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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