bare-arm, stmhal, teensy: Duplicate -nostdlib to CFLAGS

As we are building with -nostdlib gcc features like the stack protector
will fail linking, because the failure handlers are in gcc's internal
libs. Such features are implicitly disabled during compilation when
-nostdlib is used in CFLAGS too.

Signed-off-by: Sven Wegener <sven.wegener@stealer.net>

bare-arm/Makefile

@@ -13,7 +13,7 @@ INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 
 CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mabi=aapcs-linux -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -Wdouble-promotion
-CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 $(CFLAGS_CORTEX_M4) $(COPT)
+CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 -nostdlib $(CFLAGS_CORTEX_M4) $(COPT)
 
 #Debugging/Optimization
 ifeq ($(DEBUG), 1)

stmhal/Makefile

@@ -41,7 +41,7 @@ INC += -I$(FATFS_DIR)/src
 INC += -I$(CC3K_DIR)
 
 CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mabi=aapcs-linux -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard -fsingle-precision-constant -Wdouble-promotion
-CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 $(CFLAGS_CORTEX_M4) $(COPT)
+CFLAGS = $(INC) -Wall -Werror -ansi -std=gnu99 -nostdlib $(CFLAGS_CORTEX_M4) $(COPT)
 
 CFLAGS += -Iboards/$(BOARD)
 

teensy/Makefile

@@ -23,7 +23,7 @@ INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 INC += -I$(CORE_PATH)
 
-CFLAGS = $(INC) -Wall -ansi -std=gnu99 $(CFLAGS_CORTEX_M4)
+CFLAGS = $(INC) -Wall -ansi -std=gnu99 -nostdlib $(CFLAGS_CORTEX_M4)
 LDFLAGS = -nostdlib -T mk20dx256.ld
 LIBS = -L $(COMPILER_PATH)/../lib/gcc/arm-none-eabi/4.7.2/thumb2 -lgcc