Hi, This is a resend with the suggested change on the subject line. I have been trying to build Boost 1.64.0 with Oracle Developer Studio 12.6 on Oracle Solaris 11.3 x86_64 in C++14 mode. There are three errors encountered during the build. They are: 1. Problem with Boost.Log with this error message:

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Assertion: (../lnk/initializer.cc, line 1865) while processing ./boost/log/expressions/message.hpp at line 98. My comment: Acknowledged by Oracle as a compiler issue.

2. Problem with Boost.Optional with this error messages: "libs/log/src/named_scope.cpp", line 118: Error: Use of overloaded binary operator '=' is ambiguous. "./boost/optional/optional.hpp", line 900: Note: Viable candidate 'boost::optional<boost::log::v2_mt_posix::attributes::named_scope_list>& boost::optional<boost::log::v2_mt_posix::attributes::named_scope_list>::operator=<boost::log::v2_mt_posix::attributes::named_scope_list&>(boost::log::v2_mt_posix::attributes::named_scope_list&)'. "./boost/optional/optional.hpp", line 962: Note: Viable candidate 'boost::optional<boost::log::v2_mt_posix::attributes::named_scope_list>& boost::optional<boost::log::v2_mt_posix::attributes::named_scope_list>::operator=<boost::log::v2_mt_posix::attributes::named_scope_list&>(boost::log::v2_mt_posix::attributes::named_scope_list&)'. My comment: Ambiguous boost::optional<>::operator=(), possibly a Boost configuration issue or compiler SFINAE issue. I’m not that fluent with SFINAE to be able to figure this out. 3. Problem with Boost.Python with this error message: "libs/python/src/numpy/dtype.cpp", line 61: Error: NPY_FLOAT16 is not defined. My comment: Possibly a Solaris package installation issue due to no support contract. (numpy package fails to install) I would appreciate it very much if someone could give me some pointers on how to resolve the above issues. Kind regards, Leo