[llvm-bugs] [Bug 32990] New: dllimported symbols for pure virtual

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32990

            Bug ID: 32990
           Summary: dllimported symbols for pure virtual
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: zahira.ammarguellat at intel.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

CL and clang have different behavior for dllimport of pure virtual.

ksh-3.2$ cat test.cpp
class IVirtualBase
{
public:
    virtual ~IVirtualBase(){};
    virtual void speak() = 0;
};

class  VirtualClass : public virtual IVirtualBase
{
public:
    virtual ~VirtualClass(){};
    virtual void eat() = 0;
};

class __declspec(dllimport) ConcreteClass : public VirtualClass
{
public:
    ConcreteClass(int nn);
    void speak();
    void eat();
private:
    int n;
};

int main()
{
    ConcreteClass c(10);
    c.speak();
    c.eat();
    return 0;
}
ksh-3.2$

ksh-3.2$ cl -c -Od test.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.24215.1 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

test.cpp

ksh-3.2$ dumpbin /symbols test.obj | grep dllimport
008 00000000 UNDEF  notype       External     |
__imp_??0ConcreteClass@@QEAA at H@Z (__d
eclspec(dllimport) public: __cdecl ConcreteClass::ConcreteClass(int))
009 00000000 UNDEF  notype       External     |
__imp_?speak at ConcreteClass@@UEAAXXZ (
__declspec(dllimport) public: virtual void __cdecl ConcreteClass::speak(void))
00A 00000000 UNDEF  notype       External     |
__imp_?eat at ConcreteClass@@UEAAXXZ (__
declspec(dllimport) public: virtual void __cdecl ConcreteClass::eat(void))
00B 00000000 UNDEF  notype       External     |
__imp_??_DConcreteClass@@QEAAXXZ (__d
eclspec(dllimport) public: void __cdecl ConcreteClass::`vbase
destructor'(void))
ksh-3.2$
ksh-3.2$ clang -c -g test.cpp
ksh-3.2$ dumpbin /symbols test.o | grep dllimport
02B 00000000 UNDEF  notype       External     |
__imp_??0ConcreteClass@@QEAA at H@Z (__d
eclspec(dllimport) public: __cdecl ConcreteClass::ConcreteClass(int))
02C 00000000 UNDEF  notype       External     |
__imp_?speak at ConcreteClass@@UEAAXXZ (
__declspec(dllimport) public: virtual void __cdecl ConcreteClass::speak(void))
02D 00000000 UNDEF  notype       External     |
__imp_?eat at ConcreteClass@@UEAAXXZ (__
declspec(dllimport) public: virtual void __cdecl ConcreteClass::eat(void))
033 00000000 UNDEF  notype       External     | __imp_??1ConcreteClass@@UEAA at XZ
(__de
clspec(dllimport) public: virtual __cdecl ConcreteClass::~ConcreteClass(void))
ksh-3.2$

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