http://llvm.org/bugs/show_bug.cgi?id=19397
Bug ID: 19397
Summary: MS ABI: Extra vtordisp thunk generated method
inherited from virtual base
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
In this example, we generate a thunk for g and MSVC doesn't. This may not be a
correctness problem, but it shows up when comparing vftables.
$ cat t.cpp
struct A {
A() {}
virtual void f() = 0;
virtual void g();
};
struct B : A {
B() {}
virtual void g();
};
struct C : virtual B {
C() {}
virtual void f();
};
C c;
$ dumpbin /symbols t1.obj | grep ?g@
025 00000000 SECT6 notype () External | ?g@B@@$4PPPPPPPM@A@AEXXZ
([thunk]:public: virtual void __thiscall B::g`vtordisp{4294967292,0}' (void))
026 00000000 UNDEF notype External | ?g@B@@UAEXXZ (public: virtual
void __thiscall B::g(void))
02A 00000000 UNDEF notype External | ?g@A@@UAEXXZ (public: virtual
void __thiscall A::g(void))
$ dumpbin /symbols t2.obj | grep ?g@
012 00000000 UNDEF notype () External | ?g@A@@UAEXXZ (public: virtual
void __thiscall A::g(void))
014 00000000 UNDEF notype () External | ?g@B@@UAEXXZ (public: virtual
void __thiscall B::g(void))
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