In order to avoid data inconsistency between accesses of different functions of an application to a global variable in a data processing system, a) symbolic object code of a totality of functions to be executed in the data processing system is provided and those functions of the totality, called interfering functions, are identified, which access an identical global variable; b) at least one of the interfering functions is selected; c) a step of the initialization of an auxiliary variable using the value of the global variable into the object code of each function selected in step b) or of a function calling a selected function prior to its call is inserted; and d) a symbol of the global variable in the object code of the selected function is replaced by a reference to a memory space of the auxiliary variable.