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<body><span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
href="https://bugs.llvm.org/show_bug.cgi?id=52099">bug 52099</a>
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<th>What</th>
<th>Removed</th>
<th>Added</th>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
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<td>INVALID
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
href="https://bugs.llvm.org/show_bug.cgi?id=52099#c2">Comment # 2</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED INVALID - False positive on -Wunused-lambda-capture if capturing a reference to a global variable"
href="https://bugs.llvm.org/show_bug.cgi?id=52099">bug 52099</a>
from <span class="vcard"><a class="email" href="mailto:richard-llvm@metafoo.co.uk" title="Richard Smith <richard-llvm@metafoo.co.uk>"> <span class="fn">Richard Smith</span></a>
</span></b>
<pre>Clang is correct: this capture is not needed according to the rules of the C++
standard. See: <a href="https://godbolt.org/z/1h88Kf8dE">https://godbolt.org/z/1h88Kf8dE</a>
Because the reference is initialized by a constant expression, the use of the
reference is required by the C++ standard to (effectively) be rewritten to its
initializer, so the capture is unnecessary and will never actually be used.
In the case where the reference is initialized from a conditional expression,
the initializer is no longer a constant expression, so the rewrite doesn't
happen and a capture is required.</pre>
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