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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Value of _MSVC_LANG should be larger than 202002L in C++2b mode"
href="https://bugs.llvm.org/show_bug.cgi?id=51462">51462</a>
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<th>Summary</th>
<td>Value of _MSVC_LANG should be larger than 202002L in C++2b mode
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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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++2b
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>ensadc@mailnesia.com
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<th>CC</th>
<td>blitzrakete@gmail.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<div>
<pre>Currently _MSVC_LANG is defined as 201705L both in C++20 mode (/std:c++20 for
clang-cl) and in C++2b mode (/std:c++latest for clang-cl). This prevents
library code from discovering whether C++2b features are enabled.
The relevant code is in
<a href="https://github.com/llvm/llvm-project/blob/1e11ccad837c2d0d848349e7bc8f5800e5d365fc/clang/lib/Basic/Targets/OSTargets.cpp#L183-L190">https://github.com/llvm/llvm-project/blob/1e11ccad837c2d0d848349e7bc8f5800e5d365fc/clang/lib/Basic/Targets/OSTargets.cpp#L183-L190</a>
:
if (Opts.isCompatibleWithMSVC(LangOptions::MSVC2015)) {
if (Opts.CPlusPlus20)
Builder.defineMacro("_MSVC_LANG", "201705L");
else if (Opts.CPlusPlus17)
Builder.defineMacro("_MSVC_LANG", "201703L");
else if (Opts.CPlusPlus14)
Builder.defineMacro("_MSVC_LANG", "201402L");
}
For the reference, MSVC 2022 preview 3 (latest MSVC as of now) uses 202002L for
C++20 and 202004L for C++2b.</pre>
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