[LLVMbugs] [Bug 18583] New: Assertion failure on dereferencing member pointer using virtual inheritance with an incomplete class type

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18583

            Bug ID: 18583
           Summary: Assertion failure on dereferencing member pointer
                    using virtual inheritance with an incomplete class
                    type
           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: david.majnemer at gmail.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

$ cat t.cpp
struct __virtual_inheritance A;
int foo(A *a, int A::*mp) {
  return a->*mp;
}

$ clang-cl -c t.cpp
Assertion failed: DefinitionData && "queried property of class with no
definition", file ..\tools\clang\include\clang/AST/DeclCXX.h, line 562
clang-cl.exe: error: clang frontend command failed with exit code 3 (use -v to
see invocation)

Amusingly, this also kills MSVC:
$ cl -c t.cpp -nologo
t.cpp
t.cpp(4) : fatal error C1001: An internal error has occurred in the compiler.

We should require a complete class type in MS ABI mode when dereferencing a
member pointer.

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