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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang-cl generates more code, in this case the Dtor. Resulting in link errors"
href="https://bugs.llvm.org/show_bug.cgi?id=38354">38354</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Clang-cl generates more code, in this case the Dtor. Resulting in link errors
</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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<pre>Created <span class=""><a href="attachment.cgi?id=20614" name="attach_20614" title="Full reproduction">attachment 20614</a> <a href="attachment.cgi?id=20614&action=edit" title="Full reproduction">[details]</a></span>
Full reproduction
I've encountered this on both Clang-cl 6.0.0 as trunk (7.0.0) rev336178.
This is causing several (obscure) link errors which can be resolved by making
the Dtor explicit.
Resulting error, not given when compiled with CL:
error LNK2019: unresolved external symbol "public: __cdecl
A<int>::~A<int>(void)" (??1?$A@H@@QEAA@XZ) referenced in function "void __cdecl
f(void)" (?f@@YAXXZ)
Content of the files used, packages in attachment:
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 u.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 u.obj u.msvc.obj
move m.obj m.msvc.obj
link m.msvc.obj t.msvc.obj u.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
u.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 u.obj u.clang.obj
move m.obj m.clang.obj
link m.clang.obj t.clang.obj u.clang.obj
t.h
---
#pragma warning(disable : 4275)
#pragma warning(disable : 4435)
#ifdef EXPORT_DLL
#define EXPORT __declspec(dllexport)
#else
#define EXPORT __declspec(dllimport)
#endif
template <class T>
class A
{
public:
explicit A();
~A();
private:
T t;
};
class EXPORT B
{
public:
explicit B();
A<int> a;
};
t.cpp
-----
#define EXPORT_DLL
#include "t.h"
template <class T>
A<T>::A() : t{} {}
template <class T>
A<T>::~A() {}
B::B(){}
u.cpp
-----
#define EXPORT_DLL
#include "t.h"
void f()
{
B b{};
}
m.cpp
-----
#include "t.h"
int main(int, char**)
{
B{};
return 0;
}</pre>
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