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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang-cl emits bogus error LNK2019: unresolved external symbol _wmemchr"
href="https://bugs.llvm.org/show_bug.cgi?id=37911">37911</a>
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<th>Summary</th>
<td>clang-cl emits bogus error LNK2019: unresolved external symbol _wmemchr
</td>
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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
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sfinae@hotmail.com
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<pre>This was reported to MSVC:
<a href="https://developercommunity.visualstudio.com/content/problem/234075/unresolved-symbols-in-iosfwd-with-has-constexpr-ch-1.html">https://developercommunity.visualstudio.com/content/problem/234075/unresolved-symbols-in-iosfwd-with-has-constexpr-ch-1.html</a>
It appears to be a Clang bug.
C:\Temp\CLANG_REPRO>clang-cl -m32 -v
clang version 6.0.0 (tags/RELEASE_600/final)
Target: i386-pc-windows-msvc
Thread model: posix
InstalledDir: S:\msvc\src\vctools\NonShip\ClangLLVM\bin
C:\Temp\CLANG_REPRO>type pch.h
#pragma once
#include <string>
C:\Temp\CLANG_REPRO>type pch.cpp
// empty file
C:\Temp\CLANG_REPRO>type test.cpp
int main() {
(void) std::wstring().find(L' ', 0);
}
C:\Temp\CLANG_REPRO>clang-cl -m32 /EHsc /nologo /W4 -Ycpch.h -FI pch.h pch.cpp
-c -std:c++latest -MDd
C:\Temp\CLANG_REPRO>clang-cl -m32 /EHsc /nologo /W4 -Yupch.h -FI pch.h test.cpp
pch.obj -std:c++latest -MDd
test-c47dea.obj : error LNK2019: unresolved external symbol _wmemchr referenced
in function "public: static wchar_t const * __cdecl
std::_WChar_traits<wchar_t>::find(wchar_t const *,unsigned int,wchar_t const
&)" (?find@?$_WChar_traits@_W@std@@SAPB_WPB_WIAB_W@Z)
test.exe : fatal error LNK1120: 1 unresolved externals
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see
invocation)</pre>
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