Github user omalley commented on the issue:
https://github.com/apache/orc/pull/134
It looks like it is a "long" vs "long long" problem.
````
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/lib/common/configuration.cc:85:12:
error: no viable conversion from returned value of type 'optional<long>' to
function return type 'optional<long long>'
return result;
^~~~~~
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/third_party/tr2/optional.hpp:427:13:
note: candidate constructor not viable: no known conversion from
'std::experimental::optional<long>' to 'std::experimental::nullopt_t' for 1st
argument
constexpr optional(nullopt_t) noexcept : OptionalBase<T>() {};
^
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/third_party/tr2/optional.hpp:429:3:
note: candidate constructor not viable: no known conversion from
'std::experimental::optional<long>' to 'const std::experimental::optional<long
long> &' for 1st argument
optional(const optional& rhs)
^
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/third_party/tr2/optional.hpp:438:3:
note: candidate constructor not viable: no known conversion from
'std::experimental::optional<long>' to 'std::experimental::optional<long long>
&&' for 1st argument
optional(optional&& rhs) noexcept(is_nothrow_move_constructible<T>::value)
^
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/third_party/tr2/optional.hpp:447:13:
note: candidate constructor not viable: no known conversion from
'std::experimental::optional<long>' to 'const long long &' for 1st argument
constexpr optional(const T& v) : OptionalBase<T>(v) {}
^
/Users/owen/work/code/orc/build/libhdfspp_ep-prefix/src/libhdfspp_ep/third_party/tr2/optional.hpp:449:13:
note: candidate constructor not viable: no known conversion from
'std::experimental::optional<long>' to 'long long &&' for 1st argument
constexpr optional(T&& v) : OptionalBase<T>(constexpr_move(v)) {}
^
1 error generated.
make[5]: *** [lib/common/CMakeFiles/common_obj.dir/configuration.cc.o]
Error 1
make[4]: *** [lib/common/CMakeFiles/common_obj.dir/all] Error 2
make[3]: *** [all] Error 2
````
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