[riot-notifications] [RIOT-OS/RIOT] Reference errors when using multiple folders in C. (#16520)

Jean Pierre Dudey notifications at github.com
Thu Jun 3 10:56:40 CEST 2021

Hello @JaccoVeldscholten, by default RIOT compiles only files in your current directory, other directories aren't included by default so that's why you get the 'undefined reference' errors, because the linker cannot find the functions it needs for the program to work.

On the on coming version `2020.07` (and on `master` branch) you can use `EXTERNAL_MODULE_DIRS` to add folders where you want to find your modules, for example:


And on a file `libraries/Unity/Makefile`:

include $(RIOTBASE)/Makefile.base

Please note that the module name (the one you add to `USEMODULE`) must be equal to the name of the folder containing the module.

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