Is my understanding incorrect regarding the ability to upgrade the compiler version on Yosemite and El Capitan without requiring a full system upgrade?
@Mpark are you making a case for not updating to `thread_local` just yet? — *Joris Van Remoortere* Mesosphere On Fri, Dec 16, 2016 at 11:11 AM, Michael Park <mp...@apache.org> wrote: > Brief survey from the #dev channel: https://mesos.slack.com/ > archives/dev/p1481760285000430 > > Yosemite 10.10: Fail. Compilation error. (by @hausdorff > https://mesos.slack.com/archives/dev/p1481760552000435) > El Capitan 10.11: Fail. Compilation error. (by @zhitao > https://mesos.slack.com/files/zhitao/F3F7WUCNM/-.diff) > Sierra 10.12: Success (by @mpark) > > On Wed, Dec 14, 2016 at 3:27 PM, Joris Van Remoortere <jo...@mesosphere.io > > > wrote: > > > The time has come and we finally have `thread_local` support in the Apple > > tool chain: > > https://developer.apple.com/library/content/releasenotes/Dev > > eloperTools/RN-Xcode/Introduction.html > > > > In our code base we have a special exception for Apple that defines our > > thread local to be `__thread` rather than the c++11 standard > > `thread_local`. > > https://github.com/apache/mesos/blob/812e5e3d4e4d9e044a1cfe6 > > cc7eaab10efb499b6/3rdparty/stout/include/stout/thread_local.hpp > > > > A consequence of using `__thread` on Apple is that initializers for > thread > > locals are required to be constant expressions. This is not the case for > > the c++11 standard `thread_local`. > > > > I would like to propose that we remove this exception on the Apple > platform > > now that the Apple toolchain supports the c++11 standard. > > > > As I am not a common user of the Apple development experience I would > like > > to ask for some input from the community as to whether requiring this > > toolchain update is acceptable, and if we need a deprecation period or if > > we can just make this change now. > > > > I am leaning towards no deprecation period as I am not aware of > production > > environments running on systems that define `__APPLE__`. > > — > > *Joris Van Remoortere* > > Mesosphere > > >
