[llvm-bugs] [Bug 32989] New: DLL import/export and explicit instantiation

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32989

            Bug ID: 32989
           Summary: DLL import/export and explicit instantiation
           Product: clang
           Version: unspecified
          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

ksh-3.2$ cat test.cpp
struct I;
template<typename T> struct __declspec(dllimport) X {
  void f(T *p) { p->i(); }
  void f();                 // f is now overloaded.
};
template void X<I>::f(I*);
ksh-3.2$

ksh-3.2$ which cl
c:/Program files (x86)/Microsoft Visual Studio 14.0/VC/BIN/amd64/cl.EXE

ksh-3.2$ cl -c -Zi 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$ clang -v
clang version 5.0.0 (cfe/trunk 302180)
Target: x86_64-pc-windows-msvc
Thread model: posix

ksh-3.2$ clang -c -g test.cpp
test.cpp:3:19: error: member access into incomplete type 'I'
  void f(T *p) { p->i(); }
                  ^
test.cpp:6:21: note: in instantiation of member function 'X<I>::f' requested
here
template void X<I>::f(I*);
                    ^
test.cpp:1:8: note: forward declaration of 'I'
struct I;
       ^
1 error generated.
ksh-3.2$

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