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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [accepts-invalid] Dereferencing pointer to incomplete enclosing class"
href="http://llvm.org/bugs/show_bug.cgi?id=16828">16828</a>
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<th>Summary</th>
<td>[accepts-invalid] Dereferencing pointer to incomplete enclosing class
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
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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++11
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zeratul976@hotmail.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>
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<p>
<div>
<pre>Clang accepts the following code:
struct S
{
int foo();
struct nested
{
S* outer;
auto bar() -> decltype(outer->foo());
};
};
GCC rejects it, with the following errors:
test.cpp:9:37: error: invalid use of incomplete type ‘struct S’
test.cpp:1:8: error: forward declaration of ‘struct S’
The reason for rejecting it is stated in [1]. If that reasoning is sound, then
clang should reject the code as well. If it's not, I'd be curious to hear why.
[1] <a href="http://gcc.gnu.org/ml/gcc-patches/2013-08/msg00398.html">http://gcc.gnu.org/ml/gcc-patches/2013-08/msg00398.html</a></pre>
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