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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
href="https://bugs.llvm.org/show_bug.cgi?id=31976">bug 31976</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>INVALID
</td>
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<td style="text-align:right;">CC</td>
<td>
</td>
<td>richard-llvm@metafoo.co.uk
</td>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
href="https://bugs.llvm.org/show_bug.cgi?id=31976#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - invalid application of 'sizeof' to an incomplete type 'B<typename std::decay<int>::type>' (aka 'B<int>')"
href="https://bugs.llvm.org/show_bug.cgi?id=31976">bug 31976</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>Instantiation of a class template specialization results in the instantiation
of the declarations, but not definitions, of members. However, for a static
data member defined within a class, the initializer *is* usually part of the
declaration (not the definition), and so it must be instantiated with the
class.
As a result, in the middle of instantiating A<int>::B<int>, your code attempts
to determine the size of that class, which is not possible because the class
has not been fully instantiated yet.
So this is a GCC bug.</pre>
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