Hmm, I think you need to emit a definition, not just a declaration, when you
see the first use of a static local variable. Here's a valid C++1y program that
I think the current patch would reject (with a link error):
static auto f() {
static int n;
struct S { int &operator()() { return n; } };
return S();
}
int main() { return decltype(f())()(); }
http://reviews.llvm.org/D4787
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