We shouldn't complain that a dependent type is incomplete.
Tested x86_64-pc-linux-gnu, applying to trunk.
* pt.c (invalid_nontype_parm_type_p): Check for dependent class type.
---
gcc/cp/pt.c | 2 ++
gcc/testsuite/g++.dg/cpp2a/nontype-class21.C | 10 ++++++++++
gcc/testsuite/g++.dg/cpp2a/nontype-class22.C | 21 ++++++++++++++++++++
gcc/cp/ChangeLog | 5 +++++
4 files changed, 38 insertions(+)
create mode 100644 gcc/testsuite/g++.dg/cpp2a/nontype-class21.C
create mode 100644 gcc/testsuite/g++.dg/cpp2a/nontype-class22.C
diff --git a/gcc/cp/pt.c b/gcc/cp/pt.c
index 53aaad1800a..e433413827a 100644
--- 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
index 00000000000..c58fe05b9dd
--- /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
index 00000000000..026855f0bc6
--- /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}>>);
diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index cef36b2d1b2..c1fc980e287 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2019-07-19 Jason Merrill <ja...@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 <ja...@redhat.com>
PR c++/90098 - partial specialization and class non-type parms.
base-commit: d4f6160a8abbf666fc86fc9c60763b4b93da8fb9
--
2.21.0
