https://issues.dlang.org/show_bug.cgi?id=21937

          Issue ID: 21937
           Summary: importC: Support parsing __attribute specifiers
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

The aim is just to initially ignore attributes, meaning can be given to them later.
---
int fun() __attribute((pure));

--