Sun Studio 12 Update 1: OpenMP API User's Guide

6.1.2 default(__auto) Clause

The default(__auto) clause on a parallel construct directs the compiler to automatically determine the scope of all variables referenced in the construct that are not explicitly scoped in any data scope clause.

The default(__auto) clause can appear on a PARALLEL, PARALLEL DO/for, PARALLEL SECTIONS, or on a Fortran 95 PARALLEL WORKSHARE directive.