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Different structure sizes

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Different structure sizes

Subject: Different structure sizes
From: david tay <email@hidden>
Date: Mon, 12 Dec 2005 17:41:32 -0800

Hi,

I have compiled some code that uses data structures such as
typedef struct PadState {
	UInt8	num;
	UInt8	myData[7];
} PadState;

and
typedef struct DeviceSettings {
	PadState	myState;
	UInt32		myOtherStuff1;
	UInt32		myOtherStuff2;
	UInt8		myByteSizedData1;
	UInt8		myByteSizedData2;
	UInt8		myByteSizedData3;
	UInt8		myByteSizedData4;
} DeviceSettings;

In a simple user space test app, sizeof(PadState) gives 8 and sizeof (DeviceSettings) gives 20 when inspecting things using gdb.

When I use the same constructs in a kext, and look at things with remote gdb, sizeof(PadState) gives 6 and sizeof(DeviceSettings) is 20.

Both the test app and kext were compiled using gcc 4.0.1 using XCode 2.2 with MacOSX10.4u.sdk.

Is this caused by a bug in gdb? Or should I be concerned that this could be a real problem.

Thanks,

David
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Re: Different structure sizes
From: "Justin C. Walker" <email@hidden>


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