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Date: Fri, 11 Jan 2002 15:40:16 +0000
From: Russell King <rmk@arm.linux.org.uk>
To: Thomas Hood <jdthood@mail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Combined APM patch
Message-ID: <20020111154016.D31366@flint.arm.linux.org.uk>
In-Reply-To: <1010762545.788.2.camel@thanatos>
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In-Reply-To: <1010762545.788.2.camel@thanatos>; from jdthood@mail.com on Fri, Jan 11, 2002 at 10:22:24AM -0500
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On Fri, Jan 11, 2002 at 10:22:24AM -0500, Thomas Hood wrote:
> This is useful information,
> because if someone later wants to modify the code to make
> this variable non-static, the comment tells that person that
> the variable will need an initializer.

Whether a variable is static or not doesn't change whether it ends up in
the bss segment or not.

/* top level */
static int foo;
int bar;

Both foo and bar will be initialised to 0 - since they're both placed
into the BSS segment (or maybe its common subsection):

$ gcc -S -o - t.c
@ Generated by gcc 2.96 20000731 (Red Hat Linux 7.1 2.96-80) for ARM/elf
	.file	"t.c"
gcc2_compiled.:
.bss
	.align	2
foo:
	.space	4
	.comm	bar, 4	@ 4

$ gcc -S -o - t.c -fno-common
@ Generated by gcc 2.96 20000731 (Red Hat Linux 7.1 2.96-80) for ARM/elf
	.file	"t.c"
gcc2_compiled.:
.bss
	.align	2
foo:
	.space	4
	.global	bar
	.align	2
	.type	 bar,object
	.size	 bar,4
bar:
	.space	4


-- 
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html

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