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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - fatal error C1189: #error: "We don't know a correct way to implement alignof(T) in C++03 outside of Clang" (MSVC 19.27.29112)"
href="https://bugs.llvm.org/show_bug.cgi?id=47860">47860</a>
</td>
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<tr>
<th>Summary</th>
<td>fatal error C1189: #error: "We don't know a correct way to implement alignof(T) in C++03 outside of Clang" (MSVC 19.27.29112)
</td>
</tr>
<tr>
<th>Product</th>
<td>libc++
</td>
</tr>
<tr>
<th>Version</th>
<td>11.0
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Windows XP
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>release blocker
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Standards Issues
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>local.tourist.kiev@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24066" name="attach_24066" title="My build config, despite it is not that helpful alone">attachment 24066</a> <a href="attachment.cgi?id=24066&action=edit" title="My build config, despite it is not that helpful alone">[details]</a></span>
My build config, despite it is not that helpful alone
I was curious to dig deeper into unresolved bugs, for supporting libc++, with
MSVC.
So I tried such a scenario:
<span class="quote">>cmake -DLLVM_PATH=../llvm -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX="C:\Users\Worker\libcxx_dist" -G Ninja ../libcxx</span >
Haven't saw anything suspicious, until I fired Ninja:
<span class="quote">>ninja -j 1</span >
Then I saw an error:
[1/82] Building CXX object src\CMakeFiles\cxx_shared.dir\barrier.cpp.obj
FAILED: src/CMakeFiles/cxx_shared.dir/barrier.cpp.obj
"C:\PROGRA~2\Microsoft Visual
Studio\2019\Community\VC\Tools\MSVC\14.27.29110\bin\Hostx64\x64\cl.exe"
/nologo /TP -DNDEBUG -D_ALLOW_ITERATOR_DEBUG_LEVEL_MISMATCH
-D_ALLOW_MSC_VER_MISMATCH -D_CRTBLD -D_CRT_SECURE_NO_WARNINGS
-D_CRT_STDIO_ISO_WIDE_SPECIFIERS -D_LIBCPP_BUILDING_LIBRARY
-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER /DWIN32 /D_WINDOWS /W3 /GR /EHsc /MD /O2
/Ob2 /DNDEBUG -Wall -EHsc /I
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/include/c++/v1 /FI
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/__config_site -std:c++17
/showIncludes /Fosrc\CMakeFiles\cxx_shared.dir\barrier.cpp.obj
/Fdsrc\CMakeFiles\cxx_shared.dir\ /FS -c
C:\Users\Worker\Desktop\llvm-project\libcxx\src\barrier.cpp
Примечание: включение файла:
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/__config_site
Примечание: включение файла:
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/include/c++/v1\__config
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/include/c++/v1\__config(385):
warning C4668: "__ISO_C_VISIBLE" не задано как макроопределение препроцессора,
замена на "0" для "#if/#elif"
C:/Users/Worker/Desktop/llvm-project/build_libcxx_msvc/include/c++/v1\__config(439):
fatal error C1189: #error: "We don't know a correct way to implement
alignof(T) in C++03 outside of Clang"
It seems to point me into
<a href="https://github.com/llvm/llvm-project/blob/c778f6c4f9d511023c0d71b9e14a90e60445d314/libcxx/include/__config#L401">https://github.com/llvm/llvm-project/blob/c778f6c4f9d511023c0d71b9e14a90e60445d314/libcxx/include/__config#L401</a>
Not only unclear why CMake's config. does not have a pre-defined error/require
checks.
I will perform farther investigation - but there might be some bug in
generator's instructions, in case if
<a href="https://docs.microsoft.com/en-us/cpp/build/reference/std-specify-language-standard-version?view=vs-2019">https://docs.microsoft.com/en-us/cpp/build/reference/std-specify-language-standard-version?view=vs-2019</a>
should be passed/specified properly.
But I am unsure YET.
<a href="https://drive.google.com/file/d/1VmtGHaeHWzBwYznEsgEtN7uNXGu7D8qK/view?usp=sharing">https://drive.google.com/file/d/1VmtGHaeHWzBwYznEsgEtN7uNXGu7D8qK/view?usp=sharing</a>
- this is my compressed build folder.
I am using VS 2019 Community edition.
<span class="quote">>cl</span >
Оптимизирующий компилятор Microsoft (R) C/C++ версии 19.27.29112 для x64</pre>
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