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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - No diagnostic where using-declaration names entity not found by class member name lookup in any direct base"
href="http://llvm.org/bugs/show_bug.cgi?id=20250">20250</a>
</td>
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<th>Summary</th>
<td>No diagnostic where using-declaration names entity not found by class member name lookup in any direct base
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<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>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>hstong@ca.ibm.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>In N3937 subclause 7.3.3 [namespace.udecl] paragraph 17:
The base class members mentioned by a using-declaration shall be visible in the
scope of at least one of the direct base classes of the class where the
using-declaration is specified.
The same is present in C++03 (under paragraph 14).
This wording is perhaps an abuse of the term "scope"; however, I believe that
the using-declaration for B::Foo in D is intended to be invalid in the case
below.
EDG produces the following message:
"udecl.cc", line 5: error: class member designated by a using-declaration must
be visible in a direct base class
using B::Foo;
^
### SOURCE:
<span class="quote">> cat udecl.cc</span >
struct B { struct Foo; };
struct C : B { void Foo(); };
struct D : C {
using B::Foo;
typedef Foo Bar;
};
Return: 0x00:0
### COMPILER INVOCATION AND OUTPUT:
<span class="quote">> clang++ udecl.cc -std=c++03 -Wall -Wextra -pedantic-errors -c</span >
Return: 0x00:0
### EXPECTED OUTPUT:
A diagnostic.
### COMPILER VERSION INFO:
<span class="quote">> clang++ -v</span >
clang version 3.5.0
Target: powerpc64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.4
Found candidate GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Selected GCC installation: /usr/lib/gcc/ppc64-redhat-linux/4.4.6
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Selected multilib: .;@m64
Return: 0x00:0</pre>
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