PR c++/92062 - ODR-use ignored for static member of class template.

has_value_dependent_address wasn't stripping location wrappers so it
gave the wrong answer for "&x" in the static_assert.  That led us to
thinking that the expression isn't instantiation-dependent, and we
skipped static initialization of A<0>::x.

This patch adds stripping so that has_value_dependent_address gives the
same answer as it used to before the location wrappers addition.

	* pt.c (has_value_dependent_address): Strip location wrappers.

	* g++.dg/cpp0x/constexpr-odr1.C: New test.
	* g++.dg/cpp0x/constexpr-odr2.C: New test.

From-SVN: r277266

gcc/cp/ChangeLog

 2019-10-21  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/92062 - ODR-use ignored for static member of class template.
+	* pt.c (has_value_dependent_address): Strip location wrappers.
+
+2019-10-21  Marek Polacek  <polacek@redhat.com>
+
 	PR c++/92106 - ICE with structured bindings and -Wreturn-local-addr.
 	* typeck.c (maybe_warn_about_returning_address_of_local): Avoid
 	recursing on null initializer and return false instead.

gcc/cp/pt.c

@@ -6542,6 +6542,8 @@ check_valid_ptrmem_cst_expr (tree type, tree expr,
 static bool
 has_value_dependent_address (tree op)
 {
+  STRIP_ANY_LOCATION_WRAPPER (op);
+
   /* We could use get_inner_reference here, but there's no need;
      this is only relevant for template non-type arguments, which
      can only be expressed as &id-expression.  */

gcc/testsuite/ChangeLog

 2019-10-21  Marek Polacek  <polacek@redhat.com>
 
+	PR c++/92062 - ODR-use ignored for static member of class template.
+	* g++.dg/cpp0x/constexpr-odr1.C: New test.
+	* g++.dg/cpp0x/constexpr-odr2.C: New test.
+
+2019-10-21  Marek Polacek  <polacek@redhat.com>
+
 	PR c++/92106 - ICE with structured bindings and -Wreturn-local-addr.
 	* g++.dg/cpp1z/decomp50.C: New test.
 

gcc/testsuite/g++.dg/cpp0x/constexpr-odr1.C

+// PR c++/92062 - ODR-use ignored for static member of class template.
+// { dg-do run { target c++11 } }
+
+template<int> struct A {
+  static const bool x;
+  static_assert(&x, ""); // odr-uses A<...>::x
+};
+
+int g;
+
+template<int I>
+const bool A<I>::x = (g = 42, false);
+
+void f(A<0>) {}        // A<0> must be complete, so is instantiated
+int main()
+{
+  if (g != 42)
+    __builtin_abort ();
+}

gcc/testsuite/g++.dg/cpp0x/constexpr-odr2.C

+// PR c++/92062 - ODR-use ignored for static member of class template.
+// { dg-do run { target c++11 } }
+
+template<int> struct A {
+  static const bool x;
+  enum { force_instantiation =! &x}; // odr-uses A<...>::x
+};
+
+int g;
+
+template<int I>
+const bool A<I>::x = (g = 42, false);
+
+void f(A<0>) {}        // A<0> must be complete, so is instantiated
+int main()
+{
+  if (g != 42)
+    __builtin_abort ();
+}