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C++ PATCH for c++/56567 (ICE with lambda returning init-list)
- From: Jason Merrill <jason at redhat dot com>
- To: gcc-patches List <gcc-patches at gcc dot gnu dot org>
- Date: Fri, 08 Mar 2013 10:54:59 -0500
- Subject: C++ PATCH for c++/56567 (ICE with lambda returning init-list)
My initial proposal for allowing general return type deduction allowed
deduction of std::initializer_list, which is not permitted by C++11.
But this doesn't make sense, because the underlying array will
immediately leak, so we should just give an error even in C++1y.
Tested x86_64-pc-linux-gnu, applying to trunk.
commit 10c6627ac3371930fe44868ad94cb2ebc9d4e908
Author: Jason Merrill <jason@redhat.com>
Date: Fri Mar 8 10:25:55 2013 -0500
PR c++/56567
* semantics.c (apply_deduced_return_type): Don't allow returning
std::initializer_list.
diff --git a/gcc/cp/semantics.c b/gcc/cp/semantics.c
index f1eb9ba..5c93a25 100644
--- a/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@ -9061,6 +9061,12 @@ apply_deduced_return_type (tree fco, tree return_type)
if (return_type == error_mark_node)
return;
+ if (is_std_init_list (return_type))
+ {
+ error ("returning %qT", return_type);
+ return_type = void_type_node;
+ }
+
if (LAMBDA_FUNCTION_P (fco))
{
tree lambda = CLASSTYPE_LAMBDA_EXPR (current_class_type);
diff --git a/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist3.C b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist3.C
new file mode 100644
index 0000000..029287b
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/lambda/lambda-initlist3.C
@@ -0,0 +1,11 @@
+// PR c++/56567
+// { dg-require-effective-target c++11 }
+
+#include <initializer_list>
+
+int main()
+{
+ []{ return { 1, 2 }; }(); // { dg-error "initializer_list" }
+}
+
+// { dg-prune-output "return-statement with a value" }