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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang allows address of array with 'register' storage-class to be taken"
href="https://llvm.org/bugs/show_bug.cgi?id=26336">26336</a>
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<th>Summary</th>
<td>Clang allows address of array with 'register' storage-class to be taken
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>sneves@dei.uc.pt
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</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Example:
extern int f(int *);
int main() {
register int x[1];
return f(x);
}
The C99 standard, in footnote 100 of ยง6.7.1, states
<span class="quote">> However, whether or not addressable storage is actually used, the address
> of any part of an object declared with storage-class specifier register
> cannot be computed, either explicitly (by use of the unary & operator as
> discussed in 6.5.3.2) or implicitly (by converting an array name to a
> pointer as discussed in 6.3.2.1).</span >
Clang already does the right thing for explicit & operators on register
variables. However it misses the implicit pointer decay of array types.
Thus the example above should fail with a "address of register variable
requested" error message.</pre>
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