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Message: [QUOTE="dspfun, post: 3423360"] I was asked whether it is possible to prepend a name (using macro substitution) to all function names in a file/program. For example, the functions f1(), f2(), f3() should get aa_ prepended to their names? I.e., f1(), f2(), f3() should be changed to aa_f1(), aa_f2(), aa_f3() using some macro substitution. I came up with the following: **************************************************** #include <stdio.h> #define PREPEND aa_ #define MAKE_FUNC_NAME(prepend, func_name) prepend ## func_name void MAKE_FUNC_NAME(PREPEND, f1)(void) { printf("here..\n"); } **************************************************** However, this does not define the function aa_f1, instead the function PREPENDf1 is defined. Why? Is there some way to get around this to achieve what is set out to be done? [/QUOTE]