[llvm-bugs] [Bug 33735] New: Clang cannot parse xstring in Visual Studio 2017

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33735

            Bug ID: 33735
           Summary: Clang cannot parse xstring in Visual Studio 2017
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: libclang
          Assignee: unassignedclangbugs at nondot.org
          Reporter: dpldobrev at protonmail.com
                CC: klimek at google.com, llvm-bugs at lists.llvm.org

I get the following error when parsing:

c:/Program Files (x86)/Microsoft Visual
Studio/2017/Community/VC/Tools/MSVC/14.10.25017/include\xstring:1905:26: error:
constexpr variable '_Memcpy_move_offset' must be initialized by a constant
expression
        static constexpr size_t _Memcpy_move_offset = offsetof(_Mydata_t, _Bx);
                                ^                     ~~~~~~~~~~~~~~~~~~~~~~~~

I understand this is a non-conforming C++ construct. However, shouldn't there
be a way for Clang to cope with it by using a certain set of flags? Shouldn't
"-fms-extensions" and/or "-fms-compatibility" have worked?

The same bug has been asked about at
http://clang-developers.42468.n3.nabble.com/Working-around-unconformant-offsetof-in-msvc-td4056311.html
.

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