[llvm-bugs] [Bug 43965] New: Value of _MSVC_LANG doesn't match MSVC++ VS2019 /std:c++latest mode

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43965

            Bug ID: 43965
           Summary: Value of _MSVC_LANG doesn't match MSVC++ VS2019
                    /std:c++latest mode
           Product: clang
           Version: 8.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: soumi.manna at intel.com
                CC: blitzrakete at gmail.com, dgregor at apple.com,
                    erik.pilkington at gmail.com, llvm-bugs at lists.llvm.org,
                    richard-llvm at metafoo.co.uk

The value for a MS specific macro differs from Microsoft starting with VS2019
in /std:c++latest mode.

-bash-4.2$ cat msvclang.cpp

_MSVC_LANG

-bash-4.2$ cl /std:c++latest -E msvclang.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.20.27508.1 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

/std:c++latest is provided as a preview of language features from the latest
C++
working draft, and we're eager to hear about bugs and suggestions for
improvements.
However, note that these features are provided as-is without support, and
subject
to changes or removal as the working draft evolves. See
https://go.microsoft.com/fwlink/?linkid=2045807 for details.

msvclang.cpp
#line 1 "msvclang.cpp"

201705L


-bash-4.2$ clang-cl /std:c++latest -E  msvclang.cpp
# 1 "msvclang.cpp"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 391 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "msvclang.cpp" 2
201704L

Thanks,
Soumi Manna
Intel C++ Compiler

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