[webkit-dev] Request for upgrading xcode toolchains in Apple bots for C++17

[Yusuke SUZUKI]

Hi WebKittens, in particular Apple bot maintainers!

We are about to enable C++17 in all the WebKit ports, and the last step is
enabling C++17 for Xcode[1].
While the latest shipped Xcode (w/ clang) supports C++17 option
(`-std=gnu++17`), EWS build bots do not support this. Some build bots
accept `-std=c++1z`, this option causes trouble in the latest Xcode (e.g.
mac-32bit uses the newer Xcode).

Can we upgrade Xcodes in EWS and buildbots to the latest ones to accept
C++17 option? Once it is done, WebKit starts using fancy C++17 features
listed in GCC 6.0.

Best regards,
Yusuke Suzuki

[1]: https://bugs.webkit.org/show_bug.cgi?id=185176
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