[patch, revised, objc] fix PR43061

[IainS]

version b - approved by Mike Stump on the PR thread..
I don't have write access - would some kind soul pick this up?

cheers
Iain

gcc/objc/ChangeLog

2010-02-15  Iain Sandoe  <iain.sandoe@sandoe-acoustics.co.uk>

	PR objc/43061

	* objc-act.c(finish_var_decl)   Add "used" attribute to
	vars in addition to the TREE_USED. This is needed by ipa*.c
	and cgraphunit.c.  Mark OBJC_CLASS/SELECTOR refs. as
	TREE_ADDRESSABLE and DECL_PRESERVE_P.

=-=
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