[llvm-bugs] [Bug 29137] New: Inconsistency in symbol visibility for explicit template instantiation between cl.exe and clang-cl.exe

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29137

            Bug ID: 29137
           Summary: Inconsistency in symbol visibility for explicit
                    template instantiation between cl.exe and clang-cl.exe
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 6yearold at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The code in question is

https://lxr.kde.org/source/frameworks/kcoreaddons/src/lib/util/kuser.h on line
0114

and

https://lxr.kde.org/source/frameworks/kcoreaddons/src/lib/util/kuser_win.cpp on
line 0731

Compiling it with cl.exe works fine, while clang-cl.exe gives linking errors:

[ 22%] Linking CXX shared library ..\..\bin\KF5CoreAddons.dll
   Creating library ..\..\lib\KF5CoreAddons.lib and object
..\..\lib\KF5CoreAddons.exp
kshell.cpp.obj : error LNK2019: unresolved external symbol "protected: struct
KUserOrGroupId<void *> & __cdecl KUserOrGroupId<void *>::operator=(struct
KUserOrGroupId<void *> const &)" (??4?$KUserOrGroupId at PEAX@@IEAAAEAU0 at AEBU0@@Z)
referenced in function "public: struct KUserId & __cdecl
KUserId::operator=(struct KUserId const &)" (??4KUserId@@QEAAAEAU0 at AEBU0@@Z)
..\..\bin\KF5CoreAddons.dll : fatal error LNK1120: 1 unresolved externals

I could try to come up with a lesser testcase if needed.

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