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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - _umul128 symbol not found with clang-cl"
href="http://llvm.org/bugs/show_bug.cgi?id=21714">21714</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>_umul128 symbol not found with clang-cl
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Frontend
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>nicolasweber@gmx.de
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>This program builds fine with cl, but not with clang-cl:
D:\src\llvm-ninja-rel64> type davidben.cc
#include <intrin.h>
#include <stdint.h>
#include <stdio.h>
int main() {
uint64_t lo, hi;
lo = _umul128(1234, 5678, &hi);
printf("0x%08llx%08llx\n", hi, lo);
return 0;
}
D:\src\llvm-ninja-rel64>cl davidben.cc
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x64
Copyright (C) Microsoft Corporation. All rights reserved.
davidben.cc
Microsoft (R) Incremental Linker Version 12.00.21005.1
Copyright (C) Microsoft Corporation. All rights reserved.
/out:davidben.exe
davidben.obj
D:\src\llvm-ninja-rel64>where cl
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\cl.exe
D:\src\llvm-ninja-rel64>bin\clang-cl.exe davidben.cc
davidben-13b75d.obj : error LNK2019: unresolved external symbol _umul128
referenced in function main
davidben.exe : fatal error LNK1120: 1 unresolved externals
clang-cl.exe: error: linker command failed with exit code 1120 (use -v to see
invocation)
With 32bit cl, things don't work:
D:\src\llvm-ninja-rel64>where cl
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\cl.exe
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\bin\amd64\cl.exe
D:\src\llvm-ninja-rel64>cl davidben.cc
Microsoft (R) C/C++ Optimizing Compiler Version 18.00.21005.1 for x86
Copyright (C) Microsoft Corporation. All rights reserved.
davidben.cc
davidben.cc(7) : error C3861: '_umul128': identifier not found
But adding -m64 to clang-cl doesn't help (this is with `vcvarsall amd64` again
so that the right link.exe is on the path):
D:\src\llvm-ninja-rel64>bin\clang-cl.exe -m64 davidben.cc
D:\src\llvm-ninja-rel64>bin\clang-cl.exe -m64 davidben.cc
davidben-4d91fd.obj : error LNK2019: unresolved external symbol _umul128
referenced in function main
davidben.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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