Lower optimization level for Sun Studio before 12.1. At least Sun Studio 12 has problems with bit-fields exposed by nginx code (caught by test suite). They seems to be fixed in Sun Studio 12.1. As a workaround use "-fast -xalias_level=any" for older versions, it resolves the problem.

The Russian documentation is available at http://sysoev.ru/nginx/
The English documentation is available at http://nginx.net