Hi Collin, > Is the correct way to use them as Paul mentioned previously? > Like this [1]: > > > #undef printf > #define printf zprintf
This is more hairy than you might think. Because of the GCC attribute syntax. stdio.in.h does /* Don't break __attribute__((format(printf,M,N))). */ # define printf __printf__ because there are not many symbols that can be used in place of 'printf'. Do you have an idea for doing this nicely? Perhaps another kind of redirect? A 'static inline' function would not be good, because it cannot be used everywhere (ISO C 23 ยง 6.7.4.(3)). Maybe an 'extern inline'? Or can __asm__ based redirection made portable across all systems? Bruno
