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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 --- - Wtautological-undefined-compare disabled with double-macros" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23968&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=wWe_nFO4VcuptL1YrFpQx_OXtVue5MRylRxpQydNX6I&s=E989O8vuAlx20ZCttOsJC1NHXrXal40yw5HSLmXcO-0&e=">23968</a>
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<th>Summary</th>
<td>Wtautological-undefined-compare disabled with double-macros
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nlewycky@google.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Testcase:
#define NULL nullptr
#define MYIF(x) if (x) {}
struct X {};
void test(X &x) { MYIF(&x == NULL) }
with -std=c++11 should issue a warning, but doesn't. If you use 'nullptr' in
place of NULL directly, it does. If you write the if-stmt out instead of using
a macro for it, it does. But if you use two macros, it doesn't fire.</pre>
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</p>
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