bsoncxx::document::value statistics = db.stats();

gives me this link error:

stats_and_info.obj : error LNK2019: unresolved external symbol "_declspec(dllimport) public: class bsoncxx::v_noabi::document::value __cdecl mongocxx::v_noabi::database::stats(void)" (imp?stats@database@v_noabi@mongocxx@@QEAA?AVvalue@document@2bsoncxx@@XZ) referenced in function "void __cdecl T4Stats::PrintStatisticsForOneApplication(class T4Application const &)" (?PrintStatisticsForOneApplication@T4Stats@@YAXAEBVT4Application@@@Z)

This is the only error I get in a complex compile involving many thousands of lines of mongoDB C++11 code (I'm upgrading from 2.3 to 3.3.5). I am compiling with /Gd (__cdecl calling convention) even though the examples used /Gv which wrecked havoc with my use of Boost 1.60. Taking out this line, the solution compiles and links fine.