[LLVMbugs] [Bug 12815] New: Error recovery can trigger Assertion `D && "Cannot get layout of forward declarations!"'

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=12815

             Bug #: 12815
           Summary: Error recovery can trigger Assertion `D && "Cannot get
                    layout of forward declarations!"'
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: hfinkel at anl.gov
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Created attachment 8547
  --> http://llvm.org/bugs/attachment.cgi?id=8547
reduced test case (provided by Craig Schroeder)

Running clang trunk on:

typedef union{union b u;} A __attribute__ ((__transparent_union__));

results in:

t10.c:1:23: error: field has incomplete type 'union b'
typedef union{union b u;} A __attribute__ ((__transparent_union__));
                      ^
t10.c:1:21: note: forward declaration of 'union b'
typedef union{union b u;} A __attribute__ ((__transparent_union__));
                    ^
clang:
/src/llvm-trunk-writable/tools/clang/lib/AST/RecordLayoutBuilder.cpp:2385:
const clang::ASTRecordLayout& clang::ASTContext::getASTRecordLayout(const
clang::RecordDecl*) const: Assertion `D && "Cannot get layout of forward
declarations!"' failed.

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