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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 - Clang treats differently on function return type with a union"
href="https://bugs.llvm.org/show_bug.cgi?id=46645">bug 46645</a>
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<tr>
<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;">Status</td>
<td>NEW
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<td>RESOLVED
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang treats differently on function return type with a union"
href="https://bugs.llvm.org/show_bug.cgi?id=46645#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - Clang treats differently on function return type with a union"
href="https://bugs.llvm.org/show_bug.cgi?id=46645">bug 46645</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><span class="quote">> This code, test.cc, line 1 and 2 equals to line 3 (right?).</span >
They're approximately the same, but not entirely the same. The C++ rules don't
permit a type definition to appear in a return type, so line 3 is invalid, as
Clang and GCC report.
<span class="quote">> So is this a Clang's accept-invalid bug or GCC's reject-valid?</span >
This is a GCC rejects-valid bug. There's nothing wrong with line 2, and GCC's
diagnostic says that "class" was used when naming the union, which is obviously
wrong -- the keyword "class" does not appear in your example at all.
Even weirder: GCC gives a different diagnostic if you replace 'typename' with
'class'!</pre>
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