Embedded uses such HAL's extensively. There is no such nested ifdef mess mid-level devs love to create. Linux KConfig system is also properly designed, leading

Embedded uses such HAL's extensively. There is no such nested ifdef mess mid-level devs love to create. Linux KConfig system is also properly designed, leading to properly seperated features. Never mix compile-time logic with runtime logic, you get lost. No need for a study to verify this. #ifdef is not considered harmful, only stupid usage of it.