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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 - auto-returning function declarations not matched to friend definitions in template classes"
href="https://bugs.llvm.org/show_bug.cgi?id=41167">41167</a>
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<th>Summary</th>
<td>auto-returning function declarations not matched to friend definitions in template classes
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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
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</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>redbeard0531@gmail.com
</td>
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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>clang seems to be the only compiler to reject this code:
<a href="https://godbolt.org/z/jeXWIy">https://godbolt.org/z/jeXWIy</a>
// fine
constexpr int f();
struct X {
friend constexpr int f() { return 42; }
};
auto x = f();
// also fine
constexpr auto g();
struct Y {
friend constexpr auto g() { return 42; }
};
auto y = g();
// still fine
constexpr int ff();
template <typename T>
struct XX {
friend constexpr int ff() { return 42; }
};
template struct XX<int>;
auto xx = ff();
// boom
constexpr auto gg();
template <typename T>
struct YY {
friend constexpr auto gg() { return 42; }
};
template struct YY<int>;
auto yy = gg();</pre>
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