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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - __builtin_assume: constexpr conversion to bool "has side effects""
href="https://bugs.llvm.org/show_bug.cgi?id=32424">32424</a>
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<th>Summary</th>
<td>__builtin_assume: constexpr conversion to bool "has side effects"
</td>
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>normal
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>Casey@Carter.net
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=18171" name="attach_18171" title="Minimal repro">attachment 18171</a> <a href="attachment.cgi?id=18171&action=edit" title="Minimal repro">[details]</a></span>
Minimal repro
This program:
struct S {
static constexpr bool value = false;
constexpr operator bool () const noexcept { return value; }
};
int main() { __builtin_assume(S()); }
compiled with "-std=c++11 -Wassume" incorrectly diagnoses:
prog.cc:6:31: warning: the argument to '__builtin_assume' has side effects
that will be discarded [-Wassume]
int main() { __builtin_assume(S()); }
^~~
(See <a href="https://wandbox.org/permlink/yBxuUORdvKQYf5Ri">https://wandbox.org/permlink/yBxuUORdvKQYf5Ri</a>)</pre>
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