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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Unexpected template recursion limit hit for constexpr function template"
href="http://llvm.org/bugs/show_bug.cgi?id=19517">19517</a>
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<th>Summary</th>
<td>Unexpected template recursion limit hit for constexpr function template
</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>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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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>kariya_mitsuru@hotmail.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>The sample code below causes a fatal error.
========================================
template<typename T>
constexpr T f(T const&);
template<typename T>
constexpr T g(T const& val) {
return val >= 10 ? val : f(val + 1);
}
template<typename T>
constexpr T f(T const& val) {
return g(val);
}
int main() {
return f(0);
}
========================================
I think that this code should be compiled successfully.
Note that this code is compiled successfully if these functions are not
constexpr function.
(e.g. removing "constexpr" specifier from the function g)
I suspect that this is caused by <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - constexpr function template specializations are not instantiated if they are used before they are defined"
href="show_bug.cgi?id=16008">bug 16008</a>.
c.f.
<a href="http://melpon.org/wandbox/permlink/LVfTzRBLPLsKweNG">http://melpon.org/wandbox/permlink/LVfTzRBLPLsKweNG</a></pre>
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</p>
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