Syntax for Linkage in C++

You can create linkages between C++ and other languages by using linkage specifications with the following syntax, where linkage specifies the linkage associated with the function. If z/OS® XL C++ does not recognize the linkage type, it uses C linkage.

extern "linkage" { [declaration-list] }
extern "linkage"  declaration

declaration-list:
          declaration
          declaration-list declaration