[llvm-bugs] [Bug 39052] New: [Modules TS] MSVC std library produces ambiguous type_info reference

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=39052

            Bug ID: 39052
           Summary: [Modules TS] MSVC std library produces ambiguous
                    type_info reference
           Product: clang
           Version: 7.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Modules
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mwasplund at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

When compiling an project on windows using the MSVC standard library I get an
ambiguous reference to type_info:

I have attached an archive of the most simple repro of the issue. It also
includes the ii file from save-temps.

Error Message:
In file included from main.cpp:1:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\iostream:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\istream:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\ostream:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\ios:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\xlocnum:10:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\streambuf:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\xiosbase:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\xlocale:8:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\stdexcept:6:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\exception:27:
In file included from C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\vcruntime_exception.h:10:
C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\eh.h:52:14: error:
      reference to 'type_info' is ambiguous
             type_info const& _Type,
             ^
note: candidate found by name lookup is 'type_info'
note: candidate found by name lookup is 'type_info'
C:\Program Files (x86)\Microsoft Visual
Studio\2017\Community\VC\Tools\MSVC\14.15.26726\include\eh.h:52:14: error:
      reference to 'type_info' is ambiguous
note: candidate found by name lookup is 'type_info'
note: candidate found by name lookup is 'type_info'

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