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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - MSVC fails to compile SmallVector.cpp targeting arm32"
href="https://bugs.llvm.org/show_bug.cgi?id=49917">49917</a>
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<th>Summary</th>
<td>MSVC fails to compile SmallVector.cpp targeting arm32
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Support Libraries
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jenatali@microsoft.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Attempting to compile LLVM 12.x for "ARM" architectures in VS2019 latest
(v16.9.2) will fail with the following errors:
llvm-project\llvm\include\llvm/ADT/SmallVector.h(528,1): error C2719: 'Elt':
formal parameter with requested alignment of 16 won't be aligned (compiling
source file llvm-project\llvm\lib\Support\SmallVector.cpp)
llvm-project\llvm\include\llvm/ADT/SmallVector.h(528,1): error C2719: 'Elt':
formal parameter with requested alignment of 32 won't be aligned (compiling
source file llvm-project\llvm\lib\Support\SmallVector.cpp)
This appears to be due to the static assertions in SmallVector.cpp causing
template instantiation of:
void growAndAssign(size_t NumElts, T Elt)
Since this is an explicitly-aligned element being passed on the stack, MSVC
will complain because apparently that's not supported on this architecture. The
code compiles fine for x86/Win32, x64/amd64, and arm64.</pre>
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