http://llvm.org/bugs/show_bug.cgi?id=20106
Bug ID: 20106
Summary: Cannot link to DLLs if an RTTI class in the binary
derives from an RTTI class defined in a DLL
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Frontend
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
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)
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