failed assert: Duplicate empty class detected

[Quuxplusone]

Bugzilla Link	PR8796
Status	RESOLVED FIXED
Importance	P normal
Reported by	Rafael Ávila de Espíndola (rafael@espindo.la)
Reported on	2010-12-15 20:01:43 -0800
Last modified on	2010-12-29 17:20:31 -0800
Version	unspecified
Hardware	PC All
CC	andersca@icloud.com, llvm-bugs@lists.llvm.org, rjmccall@apple.com
Fixed by commit(s)
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Blocked by
See also

Running "clang -cc1 -S foo.ii" on

struct FreeCell {
};
union ThingOrCell {
  FreeCell t;
  FreeCell cell;
};
 struct Things {
  ThingOrCell things;
};
 struct Arena {
   union {
     int y;
   };
   Things t;
};
struct Arena x;

Fails with

Assertion failed: (std::find(Classes.begin(), Classes.end(), RD) ==
Classes.end() && "Duplicate empty class detected!"), function
AddSubobjectAtOffset, file
/Users/espindola/llvm/clang/lib/AST/RecordLayoutBuilder.cpp, line 221.

[Quuxplusone]

Reduced a bit:

struct FreeCell {
};
union ThingOrCell {
  FreeCell t;
  FreeCell cell;
};
struct Things {
  ThingOrCell things;
};
Things x;

[Quuxplusone]

Fixed in r122633.