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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clang-cl with -O1 doesn't generate a definition for a derived exported class's dtor"
href="http://llvm.org/bugs/show_bug.cgi?id=21373">21373</a>
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<th>Summary</th>
<td>clang-cl with -O1 doesn't generate a definition for a derived exported class's dtor
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ehsan@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>$ 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.</pre>
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