[LLVMbugs] [Bug 18233] New: [-cxx-abi microsoft] Ctors for classes with vbases have is_most_derived as the second parameter instead of last

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18233

            Bug ID: 18233
           Summary: [-cxx-abi microsoft] Ctors for classes with vbases
                    have is_most_derived as the second parameter instead
                    of last
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

LLVM's use of gtest exhibits this problem in convertible_fwd_ostream:

class convertible_fwd_ostream : public std::ostream {
  virtual void anchor();
  raw_os_ostream ros_;
public:
  convertible_fwd_ostream(std::ostream& os)
    : std::ostream(os.rdbuf()), ros_(*this) {}
  operator raw_ostream&() { return ros_; }
};

LLVM uses the parameters this, is_most_derived, os, and MSVC uses this, os,
is_most_derived, resulting in the obvious crash.

Should be easy to fix.

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