rename GCC_CFLAGS to CFLAGS_GCC, GCC_SRC_S to SRC_S_GCC etc ..

hw/bsp/stm32g4/boards/b_g474e_dpow1/board.mk

@@ -1,13 +1,10 @@
+MCU_VARIANT = stm32g474xx
+
 CFLAGS += \
 	-DSTM32G474xx \
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g474xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g474xx_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g474re

hw/bsp/stm32g4/boards/stm32g474nucleo/board.mk

@@ -1,14 +1,11 @@
+MCU_VARIANT = stm32g474xx
+
 CFLAGS += \
 	-DSTM32G474xx \
 	-DHSE_VALUE=24000000
 
-# GCC
-GCC_SRC_S += $(ST_CMSIS)/Source/Templates/gcc/startup_stm32g474xx.s
-GCC_LD_FILE = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
-
-# IAR
-IAR_SRC_S += $(ST_CMSIS)/Source/Templates/iar/startup_stm32g474xx.s
-IAR_LD_FILE = $(ST_CMSIS)/Source/Templates/iar/linker/stm32g474xx_flash.icf
+# Linker
+LD_FILE_GCC = $(BOARD_PATH)/STM32G474RETx_FLASH.ld
 
 # For flash-jlink target
 JLINK_DEVICE = stm32g474re

hw/bsp/stm32g4/family.mk

@@ -15,12 +15,12 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_STM32G4
 
 # GCC Flags
-GCC_CFLAGS += \
+CFLAGS_GCC += \
   -flto \
   -nostdlib -nostartfiles \
 
 # suppress warning caused by vendor mcu driver
-GCC_CFLAGS += -Wno-error=cast-align
+CFLAGS_GCC += -Wno-error=cast-align
 
 # -----------------
 # Sources & Include
@@ -45,5 +45,12 @@ INC += \
 	$(TOP)/$(ST_CMSIS)/Include \
 	$(TOP)/$(ST_HAL_DRIVER)/Inc
 
+# Startup
+SRC_S_GCC += $(ST_CMSIS)/Source/Templates/gcc/startup_$(MCU_VARIANT).s
+SRC_S_IAR += $(ST_CMSIS)/Source/Templates/iar/startup_$(MCU_VARIANT).s
+
+# Linker
+LD_FILE_IAR = $(ST_CMSIS)/Source/Templates/iar/linker/$(MCU_VARIANT)_flash.icf
+
 # flash target using on-board stlink
 flash: flash-stlink