http://llvm.org/bugs/show_bug.cgi?id=18434
Bug ID: 18434
Summary: [-cxx-abi microsoft] bad layout involving empty struct
field and empty virtual bases
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
given:
#if defined(__clang__) || defined(__GNUC__)
typedef __SIZE_TYPE__ size_t;
#endif
extern "C" int printf(const char *fmt, ...);
static char buffer[419430400];
inline void *operator new(size_t, void *pv) { return pv; }
struct A {
char Field;
A() { printf("Field: %d\n", (int)&Field - (int)buffer); }
};
struct B {};
struct C : A {};
struct D : virtual C {
struct {} DField;
};
struct E : virtual D, virtual B, virtual A {};
int main() { new (buffer) E; }
MSVC gives:
Field: 4
Field: 16
clang gives:
Field: 4
Field: 20
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