PR c++/90101 - dependent class non-type parameter.

We shouldn't complain that a dependent type is incomplete.

	* pt.c (invalid_nontype_parm_type_p): Check for dependent class type.

From-SVN: r273592

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index cef36b2d1b2ffe7bebb10aa5e5dcf73874675171..c1fc980e287a1d61a63f7bb04f854dab54292d36 100644 (file)
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-19  Jason Merrill  <jason@redhat.com>
+
+       PR c++/90101 - dependent class non-type parameter.
+       * pt.c (invalid_nontype_parm_type_p): Check for dependent class type.
+
 2019-07-18  Jason Merrill  <jason@redhat.com>
 
        PR c++/90098 - partial specialization and class non-type parms.

diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 53aaad1800a6b8b3545cfc8a99fabfecfe8dcb16..e433413827a341497800502bc49c35622df93d41 100644 (file)
--- a/gcc/cp/pt.c
+++ b/gcc/cp/pt.c
@@ -25228,6 +25228,8 @@ invalid_nontype_parm_type_p (tree type, tsubst_flags_t complain)
                 "with %<-std=c++2a%> or %<-std=gnu++2a%>");
          return true;
        }
+      if (dependent_type_p (type))
+       return false;
       if (!complete_type_or_else (type, NULL_TREE))
        return true;
       if (!literal_type_p (type))

diff --git a/gcc/testsuite/g++.dg/cpp2a/nontype-class21.C b/gcc/testsuite/g++.dg/cpp2a/nontype-class21.C
new file mode 100644 (file)
index 0000000..c58fe05
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/nontype-class21.C
@@ -0,0 +1,10 @@
+// PR c++/90101
+// { dg-do compile { target c++2a } }
+
+template<int N>
+struct A{};
+
+template<int N, A<N>>
+struct B {};
+
+B<2,A<2>{}> b;

diff --git a/gcc/testsuite/g++.dg/cpp2a/nontype-class22.C b/gcc/testsuite/g++.dg/cpp2a/nontype-class22.C
new file mode 100644 (file)
index 0000000..026855f
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp2a/nontype-class22.C
@@ -0,0 +1,21 @@
+// PR c++/90100
+// { dg-do compile { target c++2a } }
+
+template<typename T>
+inline constexpr bool is_nontype_list = false;
+
+template<template<auto...> typename T, auto... NonTypes>
+inline constexpr bool is_nontype_list<T<NonTypes...>> = true;
+
+// works
+template<auto...>
+struct A {};
+
+static_assert(is_nontype_list<A<1, 2, 3>>);
+
+// fails
+struct X {
+    int v;
+};
+
+static_assert(is_nontype_list<A<X{1}, X{2}, X{3}>>);