[llvm-bugs] [Bug 43954] New: [clang-cl] Missing inherited constructor in exported symbols

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43954

            Bug ID: 43954
           Summary: [clang-cl] Missing inherited constructor in exported
                    symbols
           Product: clang
           Version: 9.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: qwertiest at mail.ru
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org,
                    neeilans at live.com, richard-llvm at metafoo.co.uk

Created attachment 22790
  --> https://bugs.llvm.org/attachment.cgi?id=22790&action=edit
Source files for repro

Description:

clang-cl does not export the inherited constructor (defined via `using
Base::Base`), which breaks compatibility with MSVC cl.


Repro steps (see attachments for source files):
1. `clang-cl.exe /LD class.cpp /DMY_EXPORT_API /link /DLL /out:class.dll`
2. `cl.exe main.cpp class.lib`

Observed result: 
```
main.obj : error LNK2019: unresolved external symbol "__declspec(dllimport)
public: __thiscall DerivedWithCtor::DerivedWithCtor(void const *)"
(__imp_??0DerivedWithCtor@@QAE at PBX@Z) referenced in function "public:
__thiscall DerivedCheck::DerivedCheck(void)" (??0DerivedCheck@@QAE at XZ)
```

This is the mangling issue since manual inspection of produced DLL shows that
there was no constructor exported for `DerivedWithCtor`.
The step 1. can be performed with cl.exe for comparison.

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