[Ada] Fix ICE on constant declared as weak

[Eric Botcazou]

The ICE occurs when gigi asks the middle-end to declare a CONST_DECL as weak.
Fixed by making it declare the corresponding VAR_DECL as weak instead.

Tested on i586-suse-linux, applied on the mainline.


2009-11-23  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Variable>: Pass the list
	of attributes when building the corresponding variable of a constant.
	* gcc-interface/utils.c (create_var_decl_1): Do not process attributes
	for constants.


2009-11-23  Eric Botcazou  <ebotcazou@adacore.com>

        * gnat.dg/specs/weak1.ads: New test.


-- 
Eric Botcazou
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