I Follow the FAQ "How can an MSVC program call a MinGW DLL, and vice versa?" and generate the library testdll.lib.But when I use the testdll.lib in VC,it seems ok when linking with .c files, but when I change the file extenstion from ".c" to ".cpp", the VC can not link with it. Are there any difference between linking in C program and C++ program. -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/