> In the old days you'd get by without even defining it at all. GCC and Clang have a `__builtin_printf()` instead, quite useful for adhoc printf-debugging with

> In the old days you'd get by without even defining it at all. GCC and Clang have a `__builtin_printf()` instead, quite useful for adhoc printf-debugging without having to include stdio.h. Under the hood it just resolves to a regular printf() or puts() stdlib call though.