suppress redundant-decls warnings for freertos examples

examples/device/cdc_msc_freertos/Makefile

@@ -30,7 +30,7 @@ SRC_C += \
 	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)/*.c))
 
 # Suppress FreeRTOS warnings
-CFLAGS += -Wno-error=cast-qual
+CFLAGS += -Wno-error=cast-qual -Wno-error=redundant-decls
 
 # FreeRTOS (lto + Os) linker issue
 LDFLAGS += -Wl,--undefined=vTaskSwitchContext

examples/device/cdc_msc_freertos/src/FreeRTOSConfig/FreeRTOSConfig.h

@@ -53,6 +53,7 @@
 #if CFG_TUSB_MCU == OPT_MCU_MM32F327X
   extern u32 SystemCoreClock;
 #else
+  // FIXME cause redundant-decls warnings
   extern uint32_t SystemCoreClock;
 #endif
 

examples/device/hid_composite_freertos/Makefile

@@ -29,7 +29,7 @@ SRC_C += \
 	$(subst ../../../,,$(wildcard ../../../$(FREERTOS_SRC)/portable/GCC/$(FREERTOS_PORT)/*.c))
 
 # Suppress FreeRTOS warnings
-CFLAGS += -Wno-error=cast-qual
+CFLAGS += -Wno-error=cast-qual -Wno-error=redundant-decls
 
 # FreeRTOS (lto + Os) linker issue
 LDFLAGS += -Wl,--undefined=vTaskSwitchContext

hw/bsp/samd11/family.mk

@@ -12,7 +12,7 @@ CFLAGS += \
   -DCFG_TUSB_MCU=OPT_MCU_SAMD11
 
 # suppress warning caused by vendor mcu driver
-CFLAGS += -Wno-error=cast-qual
+CFLAGS += -Wno-error=cast-qual -Wno-error=redundant-decls
 
 SRC_C += \
 	src/portable/microchip/samd/dcd_samd.c \