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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compound assignment to bool wrong in constexpr context"
href="https://bugs.llvm.org/show_bug.cgi?id=39628">39628</a>
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<th>Summary</th>
<td>Compound assignment to bool wrong in constexpr context
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>7.0
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>elmar.braun@web.de
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Sample code (also at <a href="https://godbolt.org/z/E6BWs4">https://godbolt.org/z/E6BWs4</a>):
constexpr bool f(bool b) {
b = b | 2;
return b;
}
constexpr bool g(bool b) {
b |= 2;
return b;
}
static_assert(f(true));
static_assert(f(false));
static_assert(g(true));
static_assert(g(false)); // fails unexpectedly
At runtime g(false) evaluates to true as expected.</pre>
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