hxhim cannot build on Cray Theta

[roblatham00]

I try to build HXHIM on the Argonne Theta machine (a Cray XC40 I think). I get this error:

                 from /home/robl/src/hxhim/include/hxhim_private.hpp(9),
                 from /home/robl/src/hxhim/include/return.hpp(5),
                 from /home/robl/src/hxhim/include/hxhim.hpp(7),
                 from /home/robl/src/hxhim/include/hxhim.cpp(8):
/home/robl/src/hxhim/src/transport/transport.hpp(314): error: namespace "std" has no member "enable_if_t"
          template <typename T, typename = std::enable_if_t<std::is_convertible<T, TransportMessage>::value> >

This is with the /opt/cray/pe/craype/2.5.14/bin/CC compiler, which in turn is wrapped around Intel compiler 18.0.0

I would have thought Intel's C++ would support this. Perhaps intel is picking up an older libstdc++ on this system?

[roblatham00]

Raising this issue only so others know about it. Not critical to me.

[calccrypto]

This should help. C++11 is still the minimum requirement.