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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 --- - Don't issue -Wtautological-pointer-compare with -weak_framework"
href="https://llvm.org/bugs/show_bug.cgi?id=23347">23347</a>
</td>
</tr>
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<th>Summary</th>
<td>Don't issue -Wtautological-pointer-compare with -weak_framework
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.6
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<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>ilya.konstantinov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The recommended way to check for symbols of a framework linked with
"-weak_framework" is:
if (MyWeakLinkedFunction != NULL) {
...
}
This is according to Apple docs:
<a href="https://developer.apple.com/library/mac/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html">https://developer.apple.com/library/mac/documentation/MacOSX/Conceptual/BPFrameworks/Concepts/WeakLinking.html</a>
However, recent clang version (from Xcode 6.3.1) say:
error: comparison of function 'MyWeakLinkedFunction' not equal to a null
pointer is always true [-Werror,-Wtautological-pointer-compare]
if (MyWeakLinkedFunction != NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~
note: prefix with the address-of operator to silence this warning
if (MyWeakLinkedFunction != NULL) {
^
&</pre>
</div>
</p>
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