From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5237 invoked by alias); 8 Mar 2013 15:55:14 -0000 Received: (qmail 5204 invoked by uid 22791); 8 Mar 2013 15:55:13 -0000 X-SWARE-Spam-Status: No, hits=-6.6 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_SPAMHAUS_DROP,RCVD_IN_DNSWL_HI,RCVD_IN_HOSTKARMA_W,RP_MATCHES_RCVD,SPF_HELO_PASS X-Spam-Check-By: sourceware.org Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 08 Mar 2013 15:55:02 +0000 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r28Ft1FW023072 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Fri, 8 Mar 2013 10:55:02 -0500 Received: from [10.3.113.56] (ovpn-113-56.phx2.redhat.com [10.3.113.56]) by int-mx11.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id r28FsxWY015017 for ; Fri, 8 Mar 2013 10:55:01 -0500 Message-ID: <513A09D3.5020900@redhat.com> Date: Fri, 08 Mar 2013 15:55:00 -0000 From: Jason Merrill User-Agent: Mozilla/5.0 (X11; Linux i686; rv:21.0) Gecko/20100101 Thunderbird/21.0a2 MIME-Version: 1.0 To: gcc-patches List Subject: C++ PATCH for c++/56567 (ICE with lambda returning init-list) Content-Type: multipart/mixed; boundary="------------070704050202050309040802" Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org X-SW-Source: 2013-03/txt/msg00355.txt.bz2 This is a multi-part message in MIME format. --------------070704050202050309040802 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-length: 319 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. --------------070704050202050309040802 Content-Type: text/x-patch; name="56567.patch" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="56567.patch" Content-length: 1238 commit 10c6627ac3371930fe44868ad94cb2ebc9d4e908 Author: Jason Merrill 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 + +int main() +{ + []{ return { 1, 2 }; }(); // { dg-error "initializer_list" } +} + +// { dg-prune-output "return-statement with a value" } --------------070704050202050309040802--