Mixed-Language Programming & External Linkage

摘要

It is common practice to call functions of a C library from a C++ program. This works out well as long as you restrict yourself to the standard headers and libraries that were supplied with the operating system. But novice programmers may stumble upon some link-time errors as soon as they try to call methods of their own C library from a C++ program. Potential reasons for such failures could include everything from unfamil-iarity with linkage specifications to how C/C++ compilers handle symbols during the compilation.