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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Cannot link to DLLs if an RTTI class in the binary derives from an RTTI class defined in a DLL"
href="http://llvm.org/bugs/show_bug.cgi?id=20106">20106</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Cannot link to DLLs if an RTTI class in the binary derives from an RTTI class defined in a DLL
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>ehsan@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This bug hits us when building ICU as a DLL on Windows:
$ cat type.h
#ifdef DLL
#define API __declspec(dllexport)
#else
#define API __declspec(dllimport)
#endif
struct API VFoo {
virtual ~VFoo();
};
$ cat type.cpp
#include "type.h"
VFoo::~VFoo() {};
$ cat test.cpp
#include "type.h"
class XYZ : public VFoo {};
int main() {
new XYZ();
}
$ clang-cl -GR type.cpp -DDLL -link -dll -out:type.dll
Creating library type.lib and object type.exp
$ clang-cl -GR test.cpp type.lib -D_HAS_EXCEPTIONS=0
test-97d7d3.obj : error LNK2001: unresolved external symbol "struct VFoo `RTTI
Type Descriptor'" (??_R0?AUVFoo@@@8)
test-97d7d3.obj : error LNK2001: unresolved external symbol "VFoo::`RTTI Class
Hierarchy Descriptor'" (??_R3VFoo@@8)
test.exe : fatal error LNK1120: 2 unresolved externals
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see
invocation)</pre>
</div>
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