Add HHVM back as a build target

[jklein]

It looks like the issue that previously blocked its usage has been fixed:

facebook/hhvm#1560

There might be other blockers, but it's worth trying again IMO.

[harikt]

Sorry it is still not yet fixed at travis https://travis-ci.org/harikt/Aura.Sql/jobs/23688419 . Probably once they update to latest we can add.

[jklein]

Okay fair enough, thanks for trying!

[harikt]

We will open once travis is with the new version. And you are welcome. Next time you can open the PR and we will see whether we can merge or not ;) .

[iansltx]

Just noticed that Travis is running against 3.1 now. Maybe worthwhile to start testing against HHVM again?

[harikt]

@iansltx still failing https://travis-ci.org/auraphp/Aura.Sql/jobs/23688453

[iansltx]

Looks like the issue is here:

https://github.com/facebook/hhvm/blob/master/hphp/runtime/ext/ext_pdo.cpp#L755

and Docctrine worked around it here:

doctrine/dbal#495

I may have a workaround for this though...

[harikt]

@iansltx come with a fix, we will merge 👍 .

Thank you.

[iansltx]

50/50 that this will be labelled as wontfix, but here goes nothing:

facebook/hhvm#3041