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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - accepts-invalid when a constexpr function is called in a conditional"
href="https://bugs.llvm.org/show_bug.cgi?id=39242">39242</a>
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<th>Summary</th>
<td>accepts-invalid when a constexpr function is called in a conditional
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>C++14
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rakuco@FreeBSD.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
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<pre>constexpr bool always_false() { return false; }
int f() { return 1; }
constexpr int g() {
if (!always_false()) {}
return f();
}
The excerpt above fails on GCC and MSVC. clang++ also complains when the
conditional clause is removed:
<source>:3:15: error: constexpr function never produces a constant expression
[-Winvalid-constexpr]
constexpr int g() {
^
<source>:5:10: note: non-constexpr function 'f' cannot be used in a constant
expression
return f();
^
<source>:2:5: note: declared here
int f() { return 1; }
^</pre>
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