- $(QUANTUM_DIR)/split_common/split_util.c \
- $(QUANTUM_DIR)/split_common/i2c.c \
- $(QUANTUM_DIR)/split_common/serial.c
+ $(QUANTUM_DIR)/split_common/split_util.c
+
+ # Determine which (if any) transport files are required
+ ifneq ($(strip $(SPLIT_TRANSPORT)), custom)
+ QUANTUM_SRC += $(QUANTUM_DIR)/split_common/transport.c
+ # Functions added via QUANTUM_LIB_SRC are only included in the final binary if they're called.
+ # Unused functions are pruned away, which is why we can add both drivers here without bloat.
+ QUANTUM_LIB_SRC += $(QUANTUM_DIR)/split_common/i2c.c \
+ $(QUANTUM_DIR)/split_common/serial.c
+ endif
+ COMMON_VPATH += $(QUANTUM_PATH)/split_common