Gentoo's Bugzilla –
Attachment 507034 Details for
Bug 639116dev-db/cpp-driver-2.7.1 : /.../buffer.hpp:199:16: error: *((void*)(&<anonymous>)+8).cass::Buffer::data_.cass::Buffer::<unnamed union>::buffer may be used uninitialized in this function [-Werror=maybe-uninitialized]