https://issues.dlang.org/show_bug.cgi?id=24506

          Issue ID: 24506
           Summary: importC: illegal combination of type specifiers
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody@puremagic.com
          Reporter: feklushkin.denis@gmail.com

For included files *.i which contain line like:

__extension__ typedef long long off64_t;

Compiler (dmd and ldc2) returns:

Error: illegal combination of type specifiers

I heard what GCC extensions isn't supported by importC, but also I see what __extension__ is mentioned in importc.h so maybe it can be fixed

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