VMS Help CC, Messages, DCLMISMATLNK5  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Message        "<name>" has a void return type but its linkage
                "<name>" specifies a return location.  Standard
                linkage will be used.

 Description    If a special linkage specifies return value
                information, the declaration must not specify a void
                return type.  The special linkage was specified via
                the #pragma use_linkage directive.  Because of this
                mismatch, the compiler will ignore the special
                linkage and use the standard linkage instead.

 User Action    Make sure the return value specified by the special
                linkage matches the return type.