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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Mangler incorrectly handles templated decltype in parameter type"
href="https://bugs.llvm.org/show_bug.cgi?id=42192">42192</a>
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<th>Summary</th>
<td>Mangler incorrectly handles templated decltype in parameter type
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<th>Product</th>
<td>clang
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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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>C++
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jorg.brown@gmail.com
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<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<pre>Given this code:
template <bool _Bp, class _If, class _Then> struct cond {
using type = _If;
_If memvar;
};
template<bool b>
void t2(decltype(cond<b, int, char>::memvar) param) { }
template void t2<true>(int);
gcc mangles this as _Z2t2ILb1EEvDtsr4condIXT_EifE6memvarE
clang mangles it as _Z2t2ILb1EEvDtsr4condIXT_EicEE6memvarE
demangler.com can demangle gcc's version but not clang's.
See gcc trunk vs clang trunk at <a href="https://godbolt.org/z/Rxn4XN">https://godbolt.org/z/Rxn4XN</a>
clang has been able to compile this code since at least as far back as version
3.8, but apparently has always mangled it wrong.</pre>
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