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Unused Variables warnings with global consts.h header file
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Unused Variables warnings with global consts.h header file


  • Subject: Unused Variables warnings with global consts.h header file
  • From: "Jan Barnholt" <email@hidden>
  • Date: Sun, 27 Jan 2008 13:51:28 +0100 (MET)

Hi there,

I get these strange warnings from Xcode 2.4.1/GCC 4.0 when compiling with the Unused Variables switch turned on.
The problem is caused by a global consts.h file declaring lots of constants, mostly enums, but also a couple of const definitions, included by almost every file in the project.
For many of these files gcc gives me the warning:

  warning: 'kTBButtonDef' defined but not used

for my consts.h file containing these definitions:


#ifndef _H_CONST
#define _H_CONST


struct tTBButtonDefinition {
	int		ControlIdx;
	char		IcnsFile[256];
	int		CommandID;
};

const tTBButtonDefinition kTBButtonDef[kTBMaxConst] = {
	{	kTBCtrlIdxNew	, "New.icns"	, cmd_New	},
	{	kTBCtrlIdxOpen	, "Open.icns"	, cmd_Open	},
	{	kTBCtrlIdxSave	, "Save.icns"	, cmd_Save	}
};


const RGBColor kColMode_BW_BgCol  	= {0xFF<<8, 0xFF<<8, 0xFF<<8},
					kColMode_BW_FgCol  	= {0x11<<8, 0x11<<8, 0x11<<8};

#endif 	// _H_CONST


The warning is only given for kTBButtonDef.
A couple of other declarations like the kColMode_BW_BgCol or kColMode_BW_FgCol constants don't yield a warning at all.

I just don't understand what's so special about kTBButtonDef..
Is it a compiler bug? Or is the bug in fact that the warnings are not issued for the other declarations much similar to kTBButtonDef?

Any comments appreciated!

Thanks,
Jan
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