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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang-cl link error virtual dtor of virtual base"
href="https://bugs.llvm.org/show_bug.cgi?id=37915">37915</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang-cl link error virtual dtor of virtual base
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>6.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows NT
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jvapen@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20462" name="attach_20462" title="Reproduction">attachment 20462</a> <a href="attachment.cgi?id=20462&action=edit" title="Reproduction">[details]</a></span>
Reproduction
When compiling the same code with Clang-cl (6.0.0) and MSVC (2017), the version
of clang gives a link error while MSVCs does not.
Error: unresolved external symbol "public: virtual __cdecl A::~A(void)"
(??1A@@UEAA@XZ) referenced in function main
Full reproduction described below can also be found in attachment
t.h
===
#pragma warning(disable : 4275)
#pragma warning(disable : 4435)
#ifdef EXPORT_DLL
#define EXPORT __declspec(dllexport)
#else
#define EXPORT __declspec(dllimport)
#endif
class A
{
public:
explicit A() = default;
virtual ~A() = default;
A(const A &) = default;
A(A &&) = default;
A &operator=(const A &) = default;
A &operator=(A &&) = default;
};
class EXPORT B : public virtual A
{
public:
explicit B();
virtual ~B();
B(const B &) = default;
B(B &&) = default;
B &operator=(const B &) = default;
B &operator=(B &&) = default;
};
t.cpp
=====
#define EXPORT_DLL
#include "t.h"
B::B() = default;
B::~B() = default;
m.cpp
=====
#include "t.h"
int main(int, char**)
{
B{};
return 0;
}
run.bat
=======
cl.exe /nologo /c /GR /EHsc /fp:precise /FS /std:c++17 /diagnostics:caret /O2
/I. /MDd /Zc:forScope /bigobj /Zc:wchar_t t.cpp
cl.exe /nologo /c /GR /EHsc /fp:precise /FS /std:c++17 /diagnostics:caret /O2
/I. /MDd /Zc:forScope /bigobj /Zc:wchar_t m.cpp
move t.obj t.msvc.obj
move m.obj m.msvc.obj
link m.msvc.obj t.msvc.obj
clang-cl.exe -fms-compatibility-version=19.11 /DBOOST_USE_WINDOWS_H -w
-Wno-unused-command-line-argument /nologo /c /GR /EHsc /fp:precise /FS
/std:c++17 /diagnostics:caret /O2 /I. /MDd /Zc:forScope /bigobj /Zc:wchar_t
t.cpp
clang-cl.exe -fms-compatibility-version=19.11 /DBOOST_USE_WINDOWS_H -w
-Wno-unused-command-line-argument /nologo /c /GR /EHsc /fp:precise /FS
/std:c++17 /diagnostics:caret /O2 /I. /MDd /Zc:forScope /bigobj /Zc:wchar_t
m.cpp
move t.obj t.clang.obj
move m.obj m.clang.obj
link m.clang.obj t.clang.obj</pre>
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