[Issue 18997] New: extern(C++) mangling incorrect for wchar_t

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18997

          Issue ID: 18997
           Summary: extern(C++) mangling incorrect for wchar_t
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: turkeyman at gmail.com

DMD treats wchar_t like an alias, which leads to incorrect mangling.
MSVC mangles as '_W', and posix as 'w'.

--