https://llvm.org/bugs/show_bug.cgi?id=24541
Bug ID: 24541
Summary: Eager instantiation of constexpr variables fails if
constexpr qualifier is added by static data member
definition
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: unassignedclangb...@nondot.org
Reporter: richard-l...@metafoo.co.uk
CC: dgre...@apple.com, llvm-bugs@lists.llvm.org
Classification: Unclassified
Consider:
template < class T >
struct Foo {
T v;
constexpr Foo() : v(){}
static const Foo f;
};
template < class T >
constexpr const Foo<T> Foo<T>::f = Foo();
std::array<int, Foo<std::size_t>::f.v> a;
Clang rejects this, because it doesn't eagerly instantiate Foo<size_t>::f,
presumably because the constexpr specifier isn't seen until the out-of-line
definition is instantiated.
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