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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 --- - clang accepts illegal C++ code with invalid A::A variable declaration"
href="https://llvm.org/bugs/show_bug.cgi?id=28259">28259</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>clang accepts illegal C++ code with invalid A::A variable declaration
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>C++
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>su@cs.ucdavis.edu
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The current clang trunk (and all versions at least as early as 3.2) accepts the
following C++ code, which is illegal according to the C++ language standard
(page 53, <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4296.pdf">http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4296.pdf</a>):
struct A { A(); };
...
A::A a; // error, A::A is not a type name
$ clang++ -v
clang version 3.9.0 (trunk 273248)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/clang-trunk/bin
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.6.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.8.4
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/5.3.0
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.9
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@mx32
Selected multilib: .;@m64
$
$ clang++ -c small.cpp
$
$ g++-6.1 -c small.cpp
small.cpp: In function ‘void foo()’:
small.cpp:5:3: error: ‘A::A’ names the constructor, not the type
A::A a;
^
small.cpp:5:8: error: expected ‘;’ before ‘a’
A::A a;
^
small.cpp:5:9: error: statement cannot resolve address of overloaded function
A::A a;
^
$
----------------------
class A {};
void foo ()
{
A::A a;
}</pre>
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