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Subject: RE: problem with sizeof struct alignment
Date: Wed, 19 Nov 2003 14:48:33 -0000
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From: <kevin DOT lawton AT bt DOT com>
To: <dru AT treshna DOT com>, <cygwin AT cygwin DOT com>
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20 in hexadecimal is 32 in decimal.
-----Original Message-----
From: Andrew Hill [mailto:dru AT treshna DOT com]
Sent: 19 November 2003 12:57
To: cygwin AT cygwin DOT com
Subject: problem with sizeof struct alignment
I have this struct
typedef struct {
double arrival;
double departure;
char status;
int bookingid;
int userid;
} RoomStatus;
I'm using gcc with no compiler options or flags. Under linux with gcc,
sizeof(RoomStatus) returns me 28 - as i would expect. If I use a borland
C++ compiler it also returns a sizeof 28. But with cygwin + gcc it
returns a sizeof 32. I'm a bit confused. Does cgwin + gcc align to
nearest 8bytes for structs? Is there a compiler option to tell it to
use 4 byte alignment? Is it just me whos having this problem?
I checked the sizeof for int, double and char and they all correct,
changing the char to an int or specifically saying its a 4bit int
doens't seem to make any difference.
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