From patchwork Wed Feb 10 16:46:57 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Polacek X-Patchwork-Id: 581489 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from sourceware.org (server1.sourceware.org [209.132.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 9C8691402F0 for ; Thu, 11 Feb 2016 03:47:12 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gcc.gnu.org header.i=@gcc.gnu.org header.b=mV+X55XE; dkim-atps=neutral DomainKey-Signature: a=rsa-sha1; c=nofws; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:date :from:to:cc:subject:message-id:mime-version:content-type; q=dns; s=default; b=oZp5vTiT0FNHWf34LP6EfqU9dUSV3f5miYfnHRYMVGA/NGNDeB us7tewLfppv02BRcqo6oo8oNb8UsqwKyASN/PklmK384OVX/pdKDQksEutRrTL00 8CpY4N5MOI1fayGaeUrDUPxb5EnkolnwrmwjCHZ2yR0FDm1fIq600aQuU= DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=gcc.gnu.org; h=list-id :list-unsubscribe:list-archive:list-post:list-help:sender:date :from:to:cc:subject:message-id:mime-version:content-type; s= default; bh=VYIFsI19b5FMFfSZMLQzIS021es=; b=mV+X55XEX/kk26ichOB+ L9gNaQbU9YIJCwAn4d99jV2+4avr8gtA5V6q/AiJDmtHJsn/yhZZ+k2ZyFHEnbLf BmLh6EZ6yDpETZYLAVUuaYl/jNo18HY7SHupvf2Uw+wK63YRlatZaWJwZ2cd/31Y C2UhJBVkmYditzrW5bLf084= Received: (qmail 35222 invoked by alias); 10 Feb 2016 16:47:05 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Delivered-To: mailing list gcc-patches@gcc.gnu.org Received: (qmail 35211 invoked by uid 89); 10 Feb 2016 16:47:04 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.1 required=5.0 tests=BAYES_00, RP_MATCHES_RCVD, SPF_HELO_PASS autolearn=ham version=3.3.2 spammy=unique_ptr, Hx-languages-length:2036, Links, advise X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Wed, 10 Feb 2016 16:47:03 +0000 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 3019C49DAA for ; Wed, 10 Feb 2016 16:47:02 +0000 (UTC) Received: from redhat.com (ovpn-204-32.brq.redhat.com [10.40.204.32]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1AGkwJN006352 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 10 Feb 2016 11:47:00 -0500 Date: Wed, 10 Feb 2016 17:46:57 +0100 From: Marek Polacek To: GCC Patches Cc: Jonathan Wakely Subject: [wwwdocs] New bits to porting_to Message-ID: <20160210164657.GB3289@redhat.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.24 (2015-08-30) Some minor issues I noticed. Ok? Marek Index: porting_to.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-6/porting_to.html,v retrieving revision 1.7 diff -u -r1.7 porting_to.html --- porting_to.html 9 Feb 2016 21:06:32 -0000 1.7 +++ porting_to.html 10 Feb 2016 16:45:37 -0000 @@ -220,6 +220,28 @@ the C++ standard library.

+

Call of overloaded 'abs(unsigned int&)' is ambiguous

+ +

+The additional overloads can cause the compiler to reject invalid code that +was accepted before. An example of such code is the below: +

+ +

+#include <stdlib.h>
+
+int
+foo (unsigned x)
+{
+  abs (x);
+}
+
+ +

+Since calling abs() on an unsigned value doesn't make sense, +this code will become explicitly invalid as per discussion in the LWG. +

+

Optimizations remove null pointer checks for this

@@ -239,6 +261,15 @@ pointers, not only those involving this.

+

Deprecation of std::auto_ptr

+ +

+The std::auto_ptr template class was deprecated in C++11, so GCC +now warns about its usage. This warning can be suppressed with the +-Wno-deprecated-declarations command-line option, though we advise +to port the code to use C++11's std::unique_ptr instead. +

+

-Wmisleading-indentation

A new warning -Wmisleading-indentation was added @@ -303,8 +334,24 @@ the indentation of the source was fixed instead.

-

Links

+

Enhanced -Wnonnull

+

+The -Wnonnull warning has been improved so that it also warns +about comparing parameters declared as nonnull with NULL. For +example, the compiler will warn about the following code: +

+

+__attribute__((nonnull)) void
+foo (void *p)
+{
+  if (p == NULL)
+    abort ();
+  // ...
+}
+
+ +

Links