Hi Vardhan, GCC and other compilers, such as Sun or AIX, can cross-link C ABI. GCC and other compilers, such as Sun or AIX, cannot cross-link C++ ABI. If you need to cross-link to a C++ library you need to create a C API thunk layer to bridge from GCC C++ to Sun or AIX C++. You¹ll need to compile the Sun or AIX side of the C API thunk to the Sun/AIX C++ code with the Sun or AIX compiler. Then your GCC C++ code needs to use the C API thunk. The C API thunk is responsible for marshalling parameters (if they are more complicated than a plain old data type, such as a std::vector), and for handling exceptions that may arise on the Sun/AIX C++ side of the fence. Other issues that may arise is if the Sun/AIX C++ library uses C++ I/O. Even moreso if that C++ I/O object is used in its API -- that makes things a lot more difficult. This is not a GCC issue. Rather, it is the lack of a C++ ABI standard to which the various C++ compiler vendors can comply. (There is a C ABI standard for almost all platforms specified by the respective platform¹s OS, to which all the various C compiler vendors do comply.) HTH, --Eljay
