Just a very general remark on this topic: Mixing C and C++ is a highly delicate undertaking, see e.g. item 34 in Scott Meyer's highly recommendable "More Effective C++". The linking errors you see are probably related to initialization/shutdown of the C++ runtime system, including construction and destruction of C++ statics. Even if you don't use the latter, a library you use could do. As a rule of thumb, if any part of your program is written in C++, compile "main" with the same C++ compiler and link the same way as your C++ compiler does. Otherwise there can be *very* strange effects like non-working "catch" clauses, segfaults in C++'s runtime system, flawed template instantiations, etc. (War stories available if requested :-} Cheers S.