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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - C++ language feature macros are also set for clang.exe/clang-cl.exe (but not in MSVC2015's cl.exe)"
href="https://llvm.org/bugs/show_bug.cgi?id=27217">27217</a>
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<th>Summary</th>
<td>C++ language feature macros are also set for clang.exe/clang-cl.exe (but not in MSVC2015's cl.exe)
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.8
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Frontend
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>nikolai.kosjar@theqtcompany.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Consider
---8<--- D:\work\cppfeaturetest.cpp ---8<---
#ifdef __cpp_constexpr
#error "HAS __cpp_constexpr"
#else
#error "NO __cpp_constexpr defined"
#endif
---8<---------------------------------------
...and feeding that to clang.exe:
D:\work>D:\usr\llvm-3.8.0\bin\clang.exe D:\work\cppfeaturetest.cpp
D:\work\cppfeaturetest.cpp:2:3: error: "HAS __cpp_constexpr"
#error "HAS __cpp_constexpr"
^
1 error generated.
and cl.exe (MSVC2015):
D:\work>cl.exe D:\work\cppfeaturetest.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
cppfeaturetest.cpp
D:\work\cppfeaturetest.cpp(4): fatal error C1189: #error: "NO
__cpp_constexpr defined"
Client code checking for these macros causes trouble with
clang.exe/clang-cl.exe.</pre>
</div>
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