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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - constexpr __FUNCTION__, __func__, and __PRETTY_FUNCTION__"
href="https://llvm.org/bugs/show_bug.cgi?id=26927">26927</a>
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<th>Summary</th>
<td>constexpr __FUNCTION__, __func__, and __PRETTY_FUNCTION__
</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>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</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>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>djeedai@gmail.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Being able to use __FILE__ and __LINE__ to initialize constexpr variables is
already supported, and a valuable feature. However the non-standard
__FUNCTION__, __func__, and __PRETTY_FUNCTION__ don't seem to be declared in
such a way that would allow them to do so:
void func()
{
constexpr static const char this_file[] { __FILE__ }; // OK
constexpr static const int this_line = __LINE__; // OK
constexpr static const char this_func[] { __PRETTY_FUNCTION__ }; // compiler
error: not a constant expression
}
MSVC allows this with __FUNCSIG__. It seems there's no plan to add this for GCC
though: <a href="https://gcc.gnu.org/ml/gcc-bugs/2015-06/msg02292.html">https://gcc.gnu.org/ml/gcc-bugs/2015-06/msg02292.html</a>
This is somewhat related to #20013, although #20013 is just one possible way to
fix this.</pre>
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</p>
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