Date:	Fri, 22 Nov 1996 14:42:01 GMT
From:	kvhk AT ivs4 DOT barco DOT com (Koen Van Herck)
Message-Id:	<9611221442.AA03979@ivs4.>
To:	eliz AT is DOT elta DOT co DOT il
Cc:	A DOT APPLEYARD AT fs2 DOT mt DOT umist DOT ac DOT uk, DJGPP AT delorie DOT com
In-Reply-To:	<Pine.SUN.3.91.961122131958.26059G-100000@is> (message from Eli Zaretskii on Fri, 22 Nov 1996 13:24:21 +0200 (IST))
Subject:	Re: v2 unwanted warnings
Reply-To:	Koen DOT VanHerck AT barco DOT com

> 
> On Fri, 22 Nov 1996, A.Appleyard wrote:
> 
> > #define nu __attribute__ ((unused))
> > class point{public: double x,y;};
> > int miaow(point w nu,double z nu){}
> > and every time I got this error:-
> > 
> > t$$$.cc:3: parse error before `__attribute__'
> 
> When using a feature, it helps to first read the docs about how it should 
> be used.  You should say like so:
> 
> 	int miaow (point nu w, double nu z) {}
> 
> The attribute should go *before* the name, not after it.  Think of the 
> attribute as if it were a modifier, like `volatile'.
> 
> Note that I didn't have time to test the above, as I never used this
> attribute, so I might be wrong after all.  But it works for me in similar
> contexts and with different attributes. 
> 
The docs say:

int x __attribute__ ((aligned (16))) = 0;

I tried 

int foo(int a, int __attribute__ ((unused)) b )

and I got:

unusedpp.cc:3: warning: `unused' attribute ignored
unusedpp.cc: In function `int foo(int, int)':
unusedpp.cc:4: warning: unused parameter `int b'

So it doesn't work like that.

----
Koen Van Herck
Electronic Design Engineer
E-mail: Koen DOT VanHerck AT barco DOT com

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