Message-ID: <B5E044AF4430D311B24D0060089CD8B101F018C0@hydmail01.hyd.wilco-int.com>
From: Prashant Ramachandra <rprash AT wilco-int DOT com>
To: "'djgpp AT delorie DOT com'" <djgpp AT delorie DOT com>
Subject: RE: what is  __attribute__ ((packed));
Date: Tue, 5 Dec 2000 12:33:58 +0530 
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Reply-To: djgpp AT delorie DOT com

On Tuesday, December 05, 2000 6:05 AM, Gorden [SMTP:gorden AT ms9 DOT url DOT com DOT tw]
wrote:
| typedef struct VESA_INFO         /* VESA information block structure
| */
| { 
|    unsigned char  VESASignature[4]      __attribute__ ((packed));
|    unsigned short VESAVersion             __attribute__ ((packed));
|    unsigned long  OEMStringPtr             __attribute__ ((packed));
|    
|    unsigned char  Capabilities[4]            __attribute__
|    ((packed));
|    unsigned long  VideoModePtr            __attribute__ ((packed));
|    
|    unsigned short TotalMemory              __attribute__ ((packed));
|    
|    unsigned short OemSoftwareRev        __attribute__ ((packed)); 
|    unsigned long  OemVendorNamePtr   __attribute__ ((packed)); 
|    unsigned long  OemProductNamePtr   __attribute__ ((packed)); 
|    unsigned long  OemProductRevPtr      __attribute__ ((packed)); 
|    unsigned char  Reserved[222]             __attribute__
|    ((packed)); 
|    unsigned char  OemData[256]             __attribute__ ((packed));
|    
| } VESA_INFO;
| 
| __attribute__ ((packed));  what's that

gccdoes something known as padding to improve the performance
of your program. However, sometimes, this padding process is
unacceptable (for example in this case). Please read the FAQ.
It has a section that describes about the
__attribute__ ((packed)) feature.

Prashant
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