Message <where> "<name>" <modifier>requires an integer register but its linkage "<name>" specifies a floating register. Standard linkage will be used. Description A parameter or return value of a function type is an integer type, but the corresponding parameter or return value in the special linkage specifies a floating register. 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 register specified by the special linkage matches the type of of the corresponding parameter and return value of the function type.