Does a zero-sized object in BSS go away?

[Geoff Keating]

Kazu Hirata <kazu@cs.umass.edu> writes:

> Hi,
> 
> Consider
> 
> 	.section .text
> 	.global _main
> _main:
> 	;; Store the address of _zerosized and return.
> 	mov.w	#_zerosized,r0
> 	rts
> 	.comm _zerosized,0
> 	.end
> 
> When I assemble and link this file, I get a linker error:
> 
>   undefined reference to `_zerosized'
> 
> Is the linker supposed to assign an address to _zerosized?  Or simply
> ignore it?  I am trying this on h8300-hms.

The linker should assign an address to it.  However, some object file
formats can't represent zero-sized common objects, in which case the
assembler should probably report an error if someone tries to create one.

-- 
- Geoffrey Keating <geoffk@geoffk.org>