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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - incompatible declaration"
href="https://bugs.llvm.org/show_bug.cgi?id=42244">42244</a>
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<th>Summary</th>
<td>incompatible declaration
</td>
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<th>Product</th>
<td>clang
</td>
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<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>zhonghao@pku.org.cn
</td>
</tr>
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>clang is 9.0.0, and my code is as follows:
template<int...> struct A
{
void foo();
};
struct B
{
template<int N> friend void A<N>::A::foo();
};
clang accepts the code. gcc rejects it:
source>:7:44: error: member 'void typename A<N>::A::foo()' declared as friend
before type 'typename A<N>::A' defined
7 | template<int N> friend void A<N>::A::foo();
| ^
Compiler returned: 1
icc also rejects it:
<source>(7): error: declaration is incompatible with nontype "<unnamed>
A<N>::A::foo" (declared at line 7)
template<int N> friend void A<N>::A::foo();
^
compilation aborted for <source> (code 2)
Compiler returned: 2</pre>
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