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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Unable to initialize/assign a pointer to VLA"
href="https://bugs.llvm.org/show_bug.cgi?id=35881">35881</a>
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<th>Summary</th>
<td>Unable to initialize/assign a pointer to VLA
</td>
</tr>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>ignat.loskutov@gmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Consider the following example:
int foo(int *ptr, size_t rows, size_t cols) {
int (*m)[cols] = (int(*)[cols])(ptr);
return m[rows - 1][cols - 1];
}
It fails to compile in C++ mode with a weird error message:
1 : <source>:1:11: error: cannot initialize a variable of type 'int (*)[cols]'
with an rvalue of type 'int (*)[cols]'
int (*ptr)[cols] = (int(*)[cols])(m);
^ ~~~~~~~~~~~~~~~~~
Although VLAs are not a part of C++ standard, Clang claims to support them for
compatibility with GCC. GCC, ICC, and Clang in C mode compile this piece of
code successfully.</pre>
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