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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 --- - Program with chaining of using-declarations - Missing diagnostic message" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24029&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=tR2wWzQPVits0BjB5qffK-_PUX4hbPgf9wAxHgZEjtI&s=vtQVkAI2LEpo9aizQ4Xw9NSEqjVcBdfJz8yRp7RiD-Q&e=">24029</a>
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<th>Summary</th>
<td>Program with chaining of using-declarations - Missing diagnostic message
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</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>anders.granlund.0@gmail.com
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following program should produce a diagnostic message when trying to
compile it:
namespace X { int i; }
namespace Y { using X::i; }
int main() { using X::i; using Y::i; }
This because it violates ยง7.3.3/10 of the c++ standard:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__eel.is_c-2B-2Bdraft_basic.namespace-23namespace.udecl-2D10&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=tR2wWzQPVits0BjB5qffK-_PUX4hbPgf9wAxHgZEjtI&s=g6ijwZfFq3hFa2bHa45NFGZPxth2j5zLDT1t2e3knkI&e=">http://eel.is/c++draft/basic.namespace#namespace.udecl-10</a>.
The diagnostic message is missing. GCC gives a diagnostic message for this
program, but clang does not.
Stack overflow post confirming the bug:
<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__stackoverflow.com_questions_31224886_program-2Dwith-2Dchaining-2Dof-2Dusing-2Ddeclarations-2Dcompiles-2Don-2Dmsvs-2Dand-2Dclang-2Dbut-2Dnot-2Do&d=AwMFaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=tR2wWzQPVits0BjB5qffK-_PUX4hbPgf9wAxHgZEjtI&s=C6FfJIiU-cSbTv7kDkXrFlkEgo4BOn1RndnO0-IceG0&e=">http://stackoverflow.com/questions/31224886/program-with-chaining-of-using-declarations-compiles-on-msvs-and-clang-but-not-o</a></pre>
</div>
</p>
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