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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Warn on pointless casts with fixit to remove them"
href="https://llvm.org/bugs/show_bug.cgi?id=25120">25120</a>
</td>
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<th>Summary</th>
<td>Warn on pointless casts with fixit to remove them
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.5
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Frontend
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bugzilla@tecnocode.co.uk
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>It would be nice if Clang warned about pointless casts:
• casting a value of type (X*) to (X*)
• casting a value of type (X*) to a qualified version of (X*), like (const X*)
because these casts are entirely pointless as per §6.5.4¶5 of
<a href="http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf">http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1570.pdf</a>, plus footnote 104.
test.c:
void some_func (const char *const_param) {}
int
main (void)
{
char *str = "hi";
some_func (str); /* fine */
some_func ((const char *) str); /* should warn */
some_func ((char *) str); /* should warn */
}
$ clang -Weverything -Wno-missing-prototypes -Wno-unused-parameter test.c
$ clang --version
clang version 3.5.0 (tags/RELEASE_350/final)
Target: x86_64-redhat-linux-gnu
Thread model: posix</pre>
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