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sc_cast_of_argument_to_free

From: Reuben Thomas
Subject: sc_cast_of_argument_to_free
Date: Fri, 3 Apr 2009 14:57:18 +0100 (BST)
User-agent: Alpine 2.00 (DEB 1167 2008-08-23)
Why is this rule valid? GCC gives warnings if const pointers are not cast to non-const before passing to C. As far as I can see, this is correct: free takes a non-const argument. Should malloced memory simply not be assigned to a const pointer? 

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