From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pigeon.gentoo.org ([208.92.234.80] helo=lists.gentoo.org) by finch.gentoo.org with esmtp (Exim 4.60) (envelope-from ) id 1McNEl-0006sJ-7H for garchives@archives.gentoo.org; Sat, 15 Aug 2009 17:40:15 +0000 Received: from pigeon.gentoo.org (localhost [127.0.0.1]) by pigeon.gentoo.org (Postfix) with SMTP id 8FF86E04FA; Sat, 15 Aug 2009 17:40:01 +0000 (UTC) Received: from smtp.gentoo.org (smtp.gentoo.org [140.211.166.183]) by pigeon.gentoo.org (Postfix) with ESMTP id 70264E04FA for ; Sat, 15 Aug 2009 17:40:01 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp.gentoo.org (Postfix) with ESMTP id 0312664EA3 for ; Sat, 15 Aug 2009 17:40:01 +0000 (UTC) X-Virus-Scanned: amavisd-new at gentoo.org X-Spam-Score: -3.558 X-Spam-Level: X-Spam-Status: No, score=-3.558 required=5.5 tests=[AWL=0.041, BAYES_00=-2.599, RCVD_IN_DNSWL_LOW=-1] Received: from smtp.gentoo.org ([127.0.0.1]) by localhost (smtp.gentoo.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LD95Gk0y5x4c for ; Sat, 15 Aug 2009 17:39:54 +0000 (UTC) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.gentoo.org (Postfix) with ESMTP id F386F65B4A for ; Sat, 15 Aug 2009 17:39:52 +0000 (UTC) Received: from list by ciao.gmane.org with local (Exim 4.43) id 1McNEL-0001lR-Qm for gentoo-user@gentoo.org; Sat, 15 Aug 2009 17:39:49 +0000 Received: from athedsl-378031.home.otenet.gr ([79.131.28.173]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 15 Aug 2009 17:39:49 +0000 Received: from realnc by athedsl-378031.home.otenet.gr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sat, 15 Aug 2009 17:39:49 +0000 X-Injected-Via-Gmane: http://gmane.org/ To: gentoo-user@lists.gentoo.org From: Nikos Chantziaras Subject: [gentoo-user] Re: Gcc 4.3.4 ---> 4.4.1 Date: Sat, 15 Aug 2009 20:39:41 +0300 Organization: Lucas Barks Message-ID: References: <20090814231756.GA9536@crowfix.com> <20090815003356.GA21363@crowfix.com> <4A86EB5C.9090103@gmail.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@lists.gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: athedsl-378031.home.otenet.gr User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.1) Gecko/20090815 Thunderbird/3.0b3 In-Reply-To: <4A86EB5C.9090103@gmail.com> Sender: news X-Archives-Salt: a0f6dfe0-8e36-4879-8f6a-567a110d1b3b X-Archives-Hash: f217a0cc136183d10e5b09e48ffb260e On 08/15/2009 08:07 PM, 7v5w7go9ub0o wrote: > [...] > 1. FWIW, I found the following note: > > "To use this code transformation, GCC has to be configured with > --with-ppl and --with-cloog to enable the Graphite loop transformation > infrastructure." > > on the following page: > > On Gentoo you just need to enable the "graphite" GCC USE flag. This will pull-in ">=dev-libs/ppl-0.10" and ">=dev-libs/cloog-ppl-0.15". Also, "gcc -v" will show: "--with-ppl --with-cloog". > 2. Also FWIW, I found the following note: > > * GCC can now emit code for protecting applications from > stack-smashing attacks. The protection is realized by buffer overflow > detection and reordering of stack variables to avoid pointer corruption. > * Some built-in functions have been fortified to protect them > against various buffer overflow (and format string) vulnerabilities. > Compared to the mudflap bounds checking feature, the safe builtins have > far smaller overhead. This means that programs built using safe builtins > should not experience any measurable slowdown. > > on the following page: > > which suggests to me that the mudflap option should be disabled before > emerging world AFAIK, the mudflap pointer checker is just a command line GCC switch. You need to enable it explicitly using "-fmudflap".