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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - Cast linear array to rectangular array compilation failure" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23976&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=zCxyAMb3UW7g1yWahyil2mfnKABWQuHiaKKknYWhmKI&s=KczaP2TcdtvPdjuwwMfUXQwykX6SZUeVaBPbifsKZYk&e=">23976</a>
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<th>Summary</th>
<td>Cast linear array to rectangular array compilation failure
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.5
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</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
</td>
</tr>
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<th>Reporter</th>
<td>jhart.public@gmail.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Reinterpreting a dynamically allocated N*M block of int as an NxM rectangular
array fails with clang++ 3.5, producing a spurious error message:
test.cpp:5:8: error: non-const lvalue reference to type 'int [n][m]' cannot
bind to a value of unrelated type 'int [n][m]'
Code compiles successfully on the same platform with gcc 4.9.
test case:
#include <cassert>
void f(int *mem, int n, int m)
{
int (&array)[n][m] = *reinterpret_cast<int (*)[n][m]>(mem);
assert((void*)&array == (void*)mem);
assert(sizeof(array) == (n*m)*sizeof(int));
}
int main() {
const int N = 3;
const int M = 4;
int *p = new int[N*M];
f(p, N, M);
delete[] p;
}
clang++ -v output:
Debian clang version 3.5.2-1 (tags/RELEASE_352/final) (based on LLVM 3.5.2)
Target: x86_64-pc-linux-gnu</pre>
</div>
</p>
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