[LLVMbugs] [Bug 21060] New: MS ABI: covariant pure virtual function takes two vftable slots instead of one
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Wed Sep 24 19:04:13 PDT 2014
http://llvm.org/bugs/show_bug.cgi?id=21060
Bug ID: 21060
Summary: MS ABI: covariant pure virtual function takes two
vftable slots instead of one
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: LLVM Codegen
Assignee: unassignedclangbugs at nondot.org
Reporter: david.majnemer at gmail.com
CC: llvmbugs at cs.uiuc.edu
Classification: Unclassified
consider:
struct IA {
virtual IA *f();
};
struct __declspec(dllexport) IB : virtual IA {
virtual IB *f() = 0;
IB() {}
};
we generate:
VFTable for 'IA' in 'IB' (2 entries).
0 | IB *IB::f() [pure]
1 | IB *IB::f() [pure]
However, MSVC has a vftable with a single entry.
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