Add the clang library to the repo (with some of my changes, too).

1 files changed, 77 insertions, 0 deletions

diff --git a/clang/test/SemaTemplate/constexpr-instantiate.cpp b/clang/test/SemaTemplate/constexpr-instantiate.cpp
new file mode 100644
index 0000000..2f9fe0e
--- /dev/null
+++ b/clang/test/SemaTemplate/constexpr-instantiate.cpp
@@ -0,0 +1,77 @@
+// RUN: %clang_cc1 -std=c++11 -verify %s
+
+namespace UseBeforeDefinition {
+  struct A {
+    template<typename T> static constexpr T get() { return T(); }
+    // ok, not a constant expression.
+    int n = get<int>();
+  };
+
+  // ok, constant expression.
+  constexpr int j = A::get<int>();
+
+  template<typename T> constexpr int consume(T);
+  // ok, not a constant expression.
+  const int k = consume(0); // expected-note {{here}}
+
+  template<typename T> constexpr int consume(T) { return 0; }
+  // ok, constant expression.
+  constexpr int l = consume(0);
+
+  constexpr int m = k; // expected-error {{constant expression}} expected-note {{initializer of 'k'}}
+}
+
+namespace IntegralConst {
+  template<typename T> constexpr T f(T n) { return n; }
+  enum E {
+    v = f(0), w = f(1) // ok
+  };
+  static_assert(w == 1, "");
+
+  char arr[f('x')]; // ok
+  static_assert(sizeof(arr) == 'x', "");
+}
+
+namespace ConvertedConst {
+  template<typename T> constexpr T f(T n) { return n; }
+  int f() {
+    switch (f()) {
+      case f(4): return 0;
+    }
+    return 1;
+  }
+}
+
+namespace OverloadResolution {
+  template<typename T> constexpr T f(T t) { return t; }
+
+  template<int n> struct S { };
+
+  template<typename T> auto g(T t) -> S<f(sizeof(T))> &;
+  char &f(...);
+
+  template<typename T> auto h(T t[f(sizeof(T))]) -> decltype(&*t) {
+    return t;
+  }
+
+  S<4> &k = g(0);
+  int *p, *q = h(p);
+}
+
+namespace DataMember {
+  template<typename T> struct S { static const int k; };
+  const int n = S<int>::k; // expected-note {{here}}
+  template<typename T> const int S<T>::k = 0;
+  constexpr int m = S<int>::k; // ok
+  constexpr int o = n; // expected-error {{constant expression}} expected-note {{initializer of 'n'}}
+}
+
+namespace Reference {
+  const int k = 5;
+  template<typename T> struct S {
+    static volatile int &r;
+  };
+  template<typename T> volatile int &S<T>::r = const_cast<volatile int&>(k);
+  constexpr int n = const_cast<int&>(S<int>::r);
+  static_assert(n == 5, "");
+}