From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 26066 invoked by alias); 9 Jan 2008 14:19:49 -0000 Received: (qmail 26056 invoked by uid 22791); 9 Jan 2008 14:19:48 -0000 X-Spam-Check-By: sourceware.org Received: from nz-out-0506.google.com (HELO nz-out-0506.google.com) (64.233.162.225) by sourceware.org (qpsmtpd/0.31) with ESMTP; Wed, 09 Jan 2008 14:19:31 +0000 Received: by nz-out-0506.google.com with SMTP id f1so94899nzc.21 for ; Wed, 09 Jan 2008 06:19:29 -0800 (PST) Received: by 10.114.75.1 with SMTP id x1mr849859waa.137.1199888368852; Wed, 09 Jan 2008 06:19:28 -0800 (PST) Received: by 10.115.109.11 with HTTP; Wed, 9 Jan 2008 06:19:28 -0800 (PST) Message-ID: Date: Wed, 09 Jan 2008 14:19:00 -0000 From: Alexandre Reply-To: thekyz@gmail.com To: ecos-discuss MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline X-IsSubscribed: yes Mailing-List: contact ecos-discuss-help@ecos.sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: ecos-discuss-owner@ecos.sourceware.org Subject: [ECOS] pragma pack X-SW-Source: 2008-01/txt/msg00026.txt.bz2 Hi everybody (and happy new year would i add), I'd like to use the pragma pack(1) in one of my applications to align properly a 5 bytes structures array into flash. I know that packing reduces greatly the performances of the system but performance is not really my problem here as i'm actually looking for more memory and would greatly need to pack things up a little bit. I tried to declare the next structure as shown, with the pragmas, but it's still 8 bytes large, either read with a sizeof(pelco_pattern) or after being written in rom: #pragma pack(1) typedef struct { cyg_uint8 command2_byte; cyg_uint8 data3; cyg_uint8 data4; cyg_uint16 timestamp; } pelco_pattern; #pragma pack() Am I doing something wrong here ? Is it even possible to use "pack"'s pragmas within ecos ? Am I missing some compiler directives ? I am using the arm-elf-gcc compiler and the lpc2xxx / arm version of ecos. The compiler does not say anything about the line with the pragma in it. Thanks in advance for you answers ^^ Alex Garcia Hymatom SA -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss