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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 --- - VLA extension - explicit typing fails."
href="https://llvm.org/bugs/show_bug.cgi?id=23149">23149</a>
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<th>Summary</th>
<td>VLA extension - explicit typing fails.
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>sasho648@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>The problem is that I can't assign VLA pointer or reference to a variable with
explicit type. Examples:
void func(std::size_t sz)
{
int arr[sz];
int (*pArr)[sz] = &arr;
int (&refArr)[sz] = arr;
}
It fails to compile with those strange error message:
error: cannot initialize a variable of type 'int (*)[sz]' with an rvalue of
type 'int (*)[sz]'
int (*pArr)[sz] = &arr;
error: non-const lvalue reference to type 'int [sz]' cannot bind to a value of
unrelated type 'int [sz]'
int (&refArr)[sz] = arr;
On the other hand this works fine:
void func(std::size_t sz)
{
int arr[sz];
auto *pArr = &arr;
auto &refArr = arr;
}
While reference to VLA arrays are not part of C99, pointers to them are
well-defined and should be supported if compatibility with this standard is
supported. However I hope reference will be kept too (as they are a cool
add-on).
Those constructs are well supported by GCC compiler too.
Life examples on online-compiler with Clang(3.7.0):
Non-working example:
<a href="http://melpon.org/wandbox/permlink/ZIUJrZqmvBmDzfkC">http://melpon.org/wandbox/permlink/ZIUJrZqmvBmDzfkC</a>
Working example, second one:
<a href="http://melpon.org/wandbox/permlink/gSXxvRXQRaCBzdwN">http://melpon.org/wandbox/permlink/gSXxvRXQRaCBzdwN</a></pre>
</div>
</p>
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