CC = $(GCC_BIN)arm-none-eabi-gcc
CPP = $(GCC_BIN)arm-none-eabi-g++
CC_FLAGS = -c -Os -fno-common -fmessage-length=0 -Wall -fno-exceptions -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections 
ONLY_C_FLAGS = -std=gnu99
ONLY_CPP_FLAGS = -std=gnu++98
CC_SYMBOLS = -DTARGET_LPC1768 -DTOOLCHAIN_GCC_CS -DNDEBUG


AS = $(GCC_BIN)arm-none-eabi-as

LD = $(GCC_BIN)arm-none-eabi-gcc
LD_FLAGS = -mcpu=cortex-m3 -mthumb -Wl,--gc-sections
LD_SYS_LIBS = -lstdc++ -lsupc++ -lm -lc -lgcc

OBJCOPY = $(GCC_BIN)arm-none-eabi-objcopy

all: $(PROJECT).bin

clean:
	rm -f $(PROJECT).bin $(PROJECT).elf $(OBJECTS)

.s.o:
	$(AS)  $(CC_FLAGS) $(CC_SYMBOLS) -o $@ $<

C:\mbed>cs-make
arm-none-eabi-as  -c -Os -fno-common -fmessage-length=0 -Wall -fno-exceptions 
-mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections  -
 
DTARGET_LPC1768 -DTOOLCHAIN_GCC_CS -DNDEBUG -o 
mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.o mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.s
 
arm-none-eabi-as: unrecognized option `-Os'
 
cs-make: *** [mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.o] Error 1

Hello MBED Team. Thanks for open sourcing the libraries!!! During compiling them I think I found a bug in the Make file that gets created when you export to codesourcery. The options being passed to the assembler are not valid and produce errors. I think the $(CC_FLAGS) and $(CC_SYMBOLS) options should be removed. I think you should only be passing some options like "-mcpu=cortex-m3 -mthumb" to the assembler like in the GNU GCC export Make file. What do you think? <<code>> CC = $(GCC_BIN)arm-none-eabi-gcc CPP = $(GCC_BIN)arm-none-eabi-g++ CC_FLAGS = -c -Os -fno-common -fmessage-length=0 -Wall -fno-exceptions -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections ONLY_C_FLAGS = -std=gnu99 ONLY_CPP_FLAGS = -std=gnu++98 CC_SYMBOLS = -DTARGET_LPC1768 -DTOOLCHAIN_GCC_CS -DNDEBUG AS = $(GCC_BIN)arm-none-eabi-as LD = $(GCC_BIN)arm-none-eabi-gcc LD_FLAGS = -mcpu=cortex-m3 -mthumb -Wl,--gc-sections LD_SYS_LIBS = -lstdc++ -lsupc++ -lm -lc -lgcc OBJCOPY = $(GCC_BIN)arm-none-eabi-objcopy all: $(PROJECT).bin clean: rm -f $(PROJECT).bin $(PROJECT).elf $(OBJECTS) .s.o: $(AS) $(CC_FLAGS) $(CC_SYMBOLS) -o $@ $< <</code>> Here are the errors I get: <<code>> C:\mbed>cs-make arm-none-eabi-as -c -Os -fno-common -fmessage-length=0 -Wall -fno-exceptions -mcpu=cortex-m3 -mthumb -ffunction-sections -fdata-sections - DTARGET_LPC1768 -DTOOLCHAIN_GCC_CS -DNDEBUG -o mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.o mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.s arm-none-eabi-as: unrecognized option `-Os' cs-make: *** [mbed-NXP/cmsis/LPC1768/GCC_CS/startup_LPC17xx.o] Error 1 <</code>>