[PATCH xserver] meson: Fix epoll detection

[Eric Anholt]

Peter Harris <pharris at opentext.com> writes:

> On 2017-08-11 5:50 AM, Peter Hutterer wrote:
>> On Tue, Aug 08, 2017 at 11:16:13AM -0400, Peter Harris wrote:
>>> The epoll code depends on epoll_create1, not epoll_create.
>>>
>>> The trinary " ? 1 : false" is used because HAVE_EPOLL_CREATE1 is tested
>>> with #if instead of #ifdef.
>> 
>> might be worth using conf_data.set10(...) then? that should write out 0/1
>> correctly.
>
> ".set10" writes 1 or 0, whereas "? 1 : false" writes 1 or #undef, which
> more closely matches what autoconf does.
>
> I'm fine with .set10 if you don't mind a little divergence. Or I could
> change #if HAVE_EPOLL_CREATE1 to #ifdef HAVE_EPOLL_CREATE1 to match
> (most of) the rest of the server instead, if you prefer.

I like that -- it's what I did to our other #ifs for meson.
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