Dynamic call/fetch considerations

A DLL module differs from a regular load module in that the original source code was compiled using the DLL option of the XL C or COBOL compiler, and then uses the prelinker or binder facilities to import or export symbols.

Restriction: The DLL approach versus the COBOL dynamic call/C fetch approach are two different mechanisms for achieving the goal of structuring the application as multiple, separate modules. The two approaches do not mix, however. One or the other should be chosen. See the appropriate version of the programming guide in the Enterprise COBOL for z/OS library, which explains this in some detail and gives some trade-offs between the DLL approach and the dynamic call approach. See also z/OS Language Environment Programming Guide or z/OS XL C/C++ Programming Guide.