[gcc-in-cxx] Add a couple of CONST_CAST uses

[Ian Lance Taylor]

In C++, if you want to add const to a T** pointer, you should use
const_cast.  Otherwise, g++ will issue a warning which -Werror will
turn into an error.  I committed this patch to gcc-in-cxx branch to
use CONST_CAST in a couple of cases to avoid this warning.

Ian


2009-02-04  Ian Lance Taylor  <iant@google.com>

	* main.c (main): Use CONST_CAST when adding potentially unsafe
	const.
	* attribs.c (init_attributes): Change slot to void** and use
	CONST_CAST when assigning to it.


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