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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Value of _MSVC_LANG doesn't match MSVC++ VS2019 /std:c++latest mode"
href="https://bugs.llvm.org/show_bug.cgi?id=43965">43965</a>
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<th>Summary</th>
<td>Value of _MSVC_LANG doesn't match MSVC++ VS2019 /std:c++latest mode
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>8.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>soumi.manna@intel.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>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
<a href="https://go.microsoft.com/fwlink/?linkid=2045807">https://go.microsoft.com/fwlink/?linkid=2045807</a> 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</pre>
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