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

 Message        The use of the <spelling> option has prevented this
                redeclaration of "<variable>" from changing its
                linkage.  The linkage will be that specified by the
                earlier declaration at <location>.

 Description    In many cases, the compiler will allow a
                redeclaration of an item to change its linkage.  For
                example, in most modes, if an object is declared with
                extern linkage and later with static linkage, the
                compiler will give it static linkage.  This changing
                of linkage usually causes a warning to be issued.
                However, in cases where interfile optimization has
                been selected (-ifo on UNIX, /PLUS_LIST_OPTIMIZE on
                OpenVMS), the compiler cannot allow a later
                declaration to modify the linkage of a previous
                declaration.

 User Action    Change all declarations to use the same linkage.