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Difference between .comm and .globl + .zerofill

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Difference between .comm and .globl + .zerofill

Subject: Difference between .comm and .globl + .zerofill
From: Jonas Maebe <email@hidden>
Date: Wed, 20 Jul 2005 17:35:42 +0200

Hello,

I asked this question a while ago on Xcode-users but didn't get a reply. Maybe someone here knows the answer?

What is the practical difference between the following two (assembler) declarations, apart from the fact that the former cannot be used in dynamic libraries and the latter can be? (because in one case the data resides in the text section and in the other in the data section). Is there a reason not to always use the latter form?

.text
.align 2
.comm   _a, 4

and

.globl _a
.data
.zerofill __DATA, __common, _a, 4, 2


Thanks,


Jonas
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