https://bugs.llvm.org/show_bug.cgi?id=41167
Bug ID: 41167
Summary: auto-returning function declarations not matched to
friend definitions in template classes
Product: clang
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: redbeard0...@gmail.com
CC: blitzrak...@gmail.com, dgre...@apple.com,
erik.pilking...@gmail.com, llvm-bugs@lists.llvm.org,
richard-l...@metafoo.co.uk
clang seems to be the only compiler to reject this code:
https://godbolt.org/z/jeXWIy
// 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();
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