[riot-notifications] [RIOT-OS/RIOT] Define requirements for configuration in the build system (#14027)

Kaspar Schleiser notifications at github.com
Wed May 6 12:14:01 CEST 2020

I'd like to add another requirement:

- build each .C with the CFLAGS and and defines it needs, and no more.

This makes incremental builds possible even when configuration changes. The build system should only rebuild what needs rebuilding. (IMO, "let ccache sort that out" is a bad choice).

This rules out building e.g., core with "-DMODULE_FATFS" if there's no need. It rules out including a global "auto_config.h".

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