From 11b782f7f205c3e88efe89347cd9d80c3525e6ac Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Mon, 12 Mar 2018 08:58:38 -0400
Subject: [PATCH] PR c++/84802 - ICE capturing uninstantiated class.

	* lambda.c (build_capture_proxy): Call complete_type.

From-SVN: r258447
---
 gcc/cp/ChangeLog                                 |  5 +++++
 gcc/cp/lambda.c                                  |  2 ++
 gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice9.C | 11 +++++++++++
 3 files changed, 18 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice9.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 7ed0d5e992b..703f5970cff 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,3 +1,8 @@
+2018-03-12  Jason Merrill  <jason@redhat.com>
+
+	PR c++/84802 - ICE capturing uninstantiated class.
+	* lambda.c (build_capture_proxy): Call complete_type.
+
 2018-03-09  Jason Merrill  <jason@redhat.com>
 
 	PR c++/84770 - ICE with typedef and parameter pack.
diff --git a/gcc/cp/lambda.c b/gcc/cp/lambda.c
index de064ffc85e..b3c75c84682 100644
--- a/gcc/cp/lambda.c
+++ b/gcc/cp/lambda.c
@@ -432,6 +432,8 @@ build_capture_proxy (tree member, tree init)
       object = convert (type, ptr);
     }
 
+  complete_type (type);
+
   var = build_decl (input_location, VAR_DECL, name, type);
   SET_DECL_VALUE_EXPR (var, object);
   DECL_HAS_VALUE_EXPR_P (var) = 1;
diff --git a/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice9.C b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice9.C
new file mode 100644
index 00000000000..a07acfff884
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp1y/lambda-generic-ice9.C
@@ -0,0 +1,11 @@
+// PR c++/84802
+// { dg-do compile { target c++14 } }
+
+template <class T> struct A { };
+
+void f (A<int>& ar)
+{
+  [](const auto& x)
+    { return [x]{}(); }
+  (ar);
+}
-- 
2.30.2