NOMAPPOSSIBLE

Message        The register "<register>" cannot be mapped to a
               register on the target platform.

Description    The pragma linkage directive contains
               architecture-specific information.  The Alpha
               register conventions are different from the IA64
               registers conventions.  The compiler will normally
               try to map the Alpha registers to the corresponding
               registers on IA64.  In this case this register cannot
               be mapped because there is no corresponding IA64
               register.

User Action    Update the linkage to use a register that can be
               mapped, or specify the linkage to use the
               linkage_ia64 directive.