From a728a2ada0698cbd8688d5eb6d88d357ec27eb5b Mon Sep 17 00:00:00 2001
From: Jason Merrill <jason@redhat.com>
Date: Tue, 30 Aug 2011 11:28:40 -0400
Subject: [PATCH] re PR c++/50220 ([C++0x] [4.7 Regression] ICE when capturing
 a by-reference template function argument in a lambda)

	PR c++/50220
	* semantics.c (add_capture): Call complete_type for copy.

From-SVN: r178326
---
 gcc/cp/ChangeLog                                 | 3 +++
 gcc/cp/semantics.c                               | 3 +++
 gcc/testsuite/ChangeLog                          | 3 +++
 gcc/testsuite/g++.dg/cpp0x/lambda/lambda-50220.C | 9 +++++++++
 4 files changed, 18 insertions(+)
 create mode 100644 gcc/testsuite/g++.dg/cpp0x/lambda/lambda-50220.C

diff --git a/gcc/cp/ChangeLog b/gcc/cp/ChangeLog
index 9abac29a151..c2c00a7adf9 100644
--- a/gcc/cp/ChangeLog
+++ b/gcc/cp/ChangeLog
@@ -1,5 +1,8 @@
 2011-08-30  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50220
+	* semantics.c (add_capture): Call complete_type for copy.
+
 	PR c++/50234
 	* semantics.c (cxx_eval_component_reference): Handle
 	value-initialization for omitted initializers.
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index 1ad991fab4e..dd7c01373b5 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -8651,6 +8651,9 @@ add_capture (tree lambda, tree id, tree initializer, bool by_reference_p,
       if (!real_lvalue_p (initializer))
 	error ("cannot capture %qE by reference", initializer);
     }
+  else
+    /* Capture by copy requires a complete type.  */
+    type = complete_type (type);
 
   /* Add __ to the beginning of the field name so that user code
      won't find the field with name lookup.  We can't just leave the name
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 237deac888c..ccaf17c06b4 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,5 +1,8 @@
 2011-08-30  Jason Merrill  <jason@redhat.com>
 
+	PR c++/50220
+	* g++.dg/cpp0x/lambda/lambda-50220.C: New.
+
 	PR c++/50234
 	* g++.dg/cpp0x/constexpr-value3.C: New.
 
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-50220.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-50220.C
new file mode 100644
index 00000000000..240143cf65c
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-50220.C
@@ -0,0 +1,9 @@
+// PR c++/50220
+// { dg-options -std=c++0x }
+
+template<typename Foo> struct Foobar {};
+
+void foobar(const Foobar<void>& obj)
+{
+  [obj](){}();
+}