[patch] Fix PR c++/28112: ICE with invalid argument in attribute

[Mark Mitchell]

Volker Reichelt wrote:

> 2006-06-21  Volker Reichelt  <reichelt@igpm.rwth-aachen.de>
> 
> 	PR c++/28112
> 	* attribs.c (decl_attributes): Check for invalid arguments.

I think we should avoid creating an attribute with invalid arguments;
once we figure out the attribute is erroneous, just throw it away.

Thanks,

-- 
Mark Mitchell
CodeSourcery
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