[LLVMbugs] [Bug 18458] New: MS ABI: Assertion when laying out array of zero sized objects

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18458

            Bug ID: 18458
           Summary: MS ABI: Assertion when laying out array of zero sized
                    objects
           Product: clang
           Version: unspecified
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rnk at google.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Consider:
struct A {};
struct SmallVector {
  A InlineElts[3];
};
SmallVector D;

Gives the assertion:
Assertion failed: NextFieldOffset <= RecordSize && "Size mismatch!", file
..\tools\clang\lib\CodeGen\CGRecordLayoutBuilder.cpp, line 899

Clang thinks that the A array occupies no space, but MSVC thinks each element
is one byte, giving a sizeof of 3.

*** Dumping AST Record Layout
   0 | struct SmallVector
   0 |   struct A [3] InlineElts
     | [sizeof=1, align=1
     |  nvsize=1, nvalign=1]

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