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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [c++17] exception-specification in explicit instantiation not required"
href="https://llvm.org/bugs/show_bug.cgi?id=31081">31081</a>
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<th>Summary</th>
<td>[c++17] exception-specification in explicit instantiation not required
</td>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<tr>
<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>octoploid@yandex.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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</tr>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>except.spec/5 says:
»In an explicit instantiation an exception-specification may be specified, but
is not required.«
However clang rejects this valid code:
% cat compat.ii
template <typename T> void foo() noexcept {}
template <typename T> void bar() throw() {}
template void foo<int>();
template void bar<int>();
% clang++ -std=c++1z -c compat.ii
compat.ii:3:15: error: explicit instantiation of 'foo' does not refer to a
function template, variable template, member function, member class, or static
data member
template void foo<int>();
^
compat.ii:1:28: note: candidate template ignored: could not match 'void ()
noexcept' against 'void ()'
template <typename T> void foo() noexcept {}
^
compat.ii:4:15: error: explicit instantiation of 'bar' does not refer to a
function template, variable template, member function, member class, or static
data member
template void bar<int>();
^
compat.ii:2:28: note: candidate template ignored: could not match 'void ()
throw()' against 'void ()'
template <typename T> void bar() throw() {}
^
2 errors generated.</pre>
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