mixpanel/mixpanel-iphone — pull request #23 by pmj (2012-06-13 12:44:21+00:00)
Title: Give free functions which are not globally declared static linkage.

There's no reason for getPlatform() and calculateHMAC_SHA1() to have extern linkage, as they're only used in the file in which they're defined, with no prototypes in header files. They should therefore have static linkage.