http://llvm.org/bugs/show_bug.cgi?id=21373
Bug ID: 21373
Summary: clang-cl with -O1 doesn't generate a definition for a
derived exported class's dtor
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
$ cat test.cpp
class Base {
public:
virtual ~Base();
};
Base::~Base() {}
class __declspec(dllexport) Derived : public Base {
};
$ clang-cl -O1 -c test.cpp && llvm-nm test.obj | grep Derived
00000000 T ??0Derived@@QAE@$$QAV0@@Z
00000000 T ??0Derived@@QAE@ABV0@@Z
00000000 T ??0Derived@@QAE@XZ
w ??1Derived@@UAE@XZ
00000000 T ??4Derived@@QAEAAV0@$$QAV0@@Z
00000000 T ??4Derived@@QAEAAV0@ABV0@@Z
00000004 R ??_7Derived@@6B@
00000000 T ??_GDerived@@UAEPAXI@Z
00000000 D ??_R0?AVDerived@@@8
00000000 R ??_R1A@?0A@EA@Derived@@8
00000000 R ??_R2Derived@@8
00000000 R ??_R3Derived@@8
00000000 R ??_R4Derived@@6B@
Note how the ??1Derived@@UAE@XZ symbol is undefined. Removing either -O1 or
the dllexport on Derived makes the bug go away.
This hits Skia's SkNullGLContext class.
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