http://llvm.org/bugs/show_bug.cgi?id=16008
Bug ID: 16008
Summary: constexpr function template specializations referenced
from default initializers are not instantiated
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Example from DR1637:
struct A {
template <class T> constexpr void* f(T) { return nullptr; }
A* ap = (A*)f(A());
template <class ...T> constexpr A() {}
};
A *q = A().ap;
We do not instantiate a definition of A::f<A> here. Presumably this is because
we trigger the instantiation of the definition A::f<A> while parsing the
default initializer (before we've parsed the definition of A::f), and don't
make a note that we'll need to retry instantiation later if that instantiation
fails.
Reduced example:
template<typename T> constexpr int f(T);
int k = f(0);
template<typename T> constexpr int f(T) { return 0; }
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