Header Files and Includes
Preprocessing Macros
I found this usage of defining empty macros in pico sdk, and it's sometimes useful:
#define _REG_(x)
_REG_(SIO_GPIO_OE_SET_OFFSET)
Header Files and Includes https://cplusplus.com/forum/articles/10627/ https://stackoverflow.com/questions/2762568/c-c-include-header-file-or...