https://issues.dlang.org/show_bug.cgi?id=21970

          Issue ID: 21970
           Summary: importC: Error: variable extern symbols cannot have
                    initializers
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: ibuclaw@gdcproject.org

All extern variables are rejected.
---
extern int signgam;
extern char *program_invocation_name;

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