netdev - RE: [PATCH] iwl4965: Enable checking of format strings

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Date:	Fri, 13 Feb 2015 11:20:47 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Rasmus Villemoes' <linux@...musvillemoes.dk>,
	Mark Rustad <mrustad@...il.com>
CC:	"Rustad, Mark D" <mark.d.rustad@...el.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	Kalle Valo <kvalo@...eaurora.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] iwl4965: Enable checking of format strings

From: Rasmus Villemoes
> Well, probably the linker is allowed to overlap "anonymous" objects
> (string literals) with whatever const char[] (or indeed any const)
> object it finds containing the appropriate byte sequence. But I think
> language lawyers would insist that for
> 
> const char foo[] = "a string";
> const char bar[] = "a string";

A quick test shows those are separate strings.
But 'const char *foo = "xxx";' will share.
You also need -O1 to get the strings into .rodata.str.n so that the linker
can merge them.

	David

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