General facts about C++ to COBOL ILC

Enterprise COBOL for z/OS, COBOL for OS/390 & VM, and COBOL for MVS & VM can use the C-style linkage and non-void function return values to pass and receive parameters by value.
Language Environment does not support the passing of return codes between C++ and COBOL routines in an ILC application.
There is no ILC support between AMODE 31 and AMODE 64 applications. COBOL does not support AMODE 64.