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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [C++11/14] Body of constexpr function templates instantiated too eagerly in unevaluated operands"
href="https://llvm.org/bugs/show_bug.cgi?id=23135">23135</a>
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<th>Summary</th>
<td>[C++11/14] Body of constexpr function templates instantiated too eagerly in unevaluated operands
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Keywords</th>
<td>compile-fail
</td>
</tr>
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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>C++11
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>gonzalobg88@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>dgregor@apple.com, llvmbugs@cs.uiuc.edu, richard-llvm@metafoo.co.uk
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>GCC has the same bug: <a href="https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52269">https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52269</a>
~Quoting that bug report:
Ai Azuma wrote:
The following well-formed code cannot be compiled with clang-trunk and the
-std=c++11 (and -std=c++14) flags.
template<typename T>
int f(T x)
{
return x.get();
}
template<typename T>
constexpr int g(T x)
{
return x.get();
}
int main() {
// O.K. The body of `f' is not required.
decltype(f(0)) a;
// Seems to instantiate the body of `g'
// and results in an error.
decltype(g(0)) b;
return 0;
}</pre>
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