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-Werror=suggest-attribute=pure breakage

From: Pádraig Brady
Subject: -Werror=suggest-attribute=pure breakage
Date: Fri, 08 Jul 2011 11:47:39 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100227 Thunderbird/3.0.3

$ gcc --version
gcc (GCC) 4.6.0 20110509 (Red Hat 4.6.0-7)

$ make
test.c:95:1: error: function might be candidate for attribute 'pure' if it is 
known to return normally [-Werror=suggest-attribute=pure]

As far as I can see the advance() function is not pure
as it updates the global variable 'pos'.



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