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

[Nico Weber via cfe-commits]

Back at my desk now, looking.

On Tue, Jan 19, 2016 at 3:44 PM, Diego Novillo <dnovillo at google.com> wrote:

>
>
> On Tue, Jan 19, 2016 at 3:43 PM, Nico Weber <thakis at google.com> wrote:
>
>> 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.
>>
>
> But then you need to fix all the warnings it's producing in an llvm
> build.  That is currently blocking several folks (us included).
>
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