Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide

Features of CDECL

The following rules apply to the CDECL calling convention:

When building export or import lists in .DEF files, the decorated version of the name should be used. If you used undecorated names in the DEF file, you must give the object files to ILIB along with the DEF file. ILIB uses the object files to determine how each name ended up after decoration.

Rational Developer for System z
PL/I for Windows, Version 8.0, Programming Guide