Message This declaration of "<name>" specifies a different thread-local attribute than a declaration in another module of this compilation at <where>. Description In a compilation where interfile optimization has been selected (-ifo on UNIX, /PLUS_LIST_OPTIMIZE on OpenVMS), the compiler has detected a name with external linkage declared thread-local in one module and not thread-local in another. This can lead to unexpected results at runtime. User Action Modify one the declarations to make the thread-local attributes match.