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undefined reference to strcmp [message #813762]

Mon, 05 March 2012 12:16

Eclipse User

Hi everybody,

maybe it is a stupid question, but I am stuck on it.
I am using an arm-none-eabi toolchain. when I use a function such as strcmp(..); I get un error: undefined reference to strcmp in this case, as you may see from the attached file.

this function is defined in the string.h header file, which I have included in my workspace. index.php/fa/7405/0/

Please advice!

Regards,

Pau index.php/fa/7405/0/

Attachment: undefinedError.jpg
(Size: 388.27KB, Downloaded 5307 times)

Re: undefined reference to strcmp [message #813840 is a reply to message #813762]

Mon, 05 March 2012 14:26

Eclipse User

I don't see a #include for string.h in your source file. You have to tell the compiler what header files your program includes before it will look for them.

Re: undefined reference to strcmp [message #814274 is a reply to message #813840]

Tue, 06 March 2012 03:51

Eclipse User

Thanks for your prompt reply!
Maybe I did not explain myself. That header file was already in the project although you did not see it, it is defined in the "include" zone, such as:
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_conf.h"
#include "stm32f10x.h" /* S'hi defineix el tipus de MCU utilitzat*/
#include "stm32f10x_it.h"
#include "string.h"

In the path & Symbols (properties of the project) I have add the path where those header files are in order to use their functions. (Please have a look to the file attached)

Maybe the problem is in my makefile (file attached), where I have not defined where to find that header file. I found this makefile in the web and I adapted to my project.

As I said before any idea will be welcome.

Pau

Attachment: path_Symbols.jpg
(Size: 152.75KB, Downloaded 453 times)
Attachment: Makefile
(Size: 4.15KB, Downloaded 457 times)

Re: undefined reference to strcmp [message #814480 is a reply to message #814274]

Tue, 06 March 2012 08:58

Eclipse User

You must use angle brackets for system includes.

#include <string.h>

Re: undefined reference to strcmp [message #815150 is a reply to message #814480]

Wed, 07 March 2012 04:39

Eclipse User

Yeah, thanks Axel for your reply!

you are absolutly right! Although, apparently the problem is not there! I have done the modifications and I still get the error.
I reckon that my problem is inside the makefile, which while it is linking it does not find these functions.
I am saying this because the output of the makefile:

...
..linking
arm-none-eabi-ld -g -v -nostartfiles -Map ./main.map -T./lib/stm32_flash.ld -o ./main.out obj/main.o obj/system_stm32f10x.o obj/stm32f10x_gpio.o obj/stm32f10x_rcc.o obj/stm32f10x_it.o obj/stm32f10x_exti.o obj/stm32f10x_pwr.o obj/stm32f10x_dbgmcu.o obj/stm32f10x_usart.o obj/stm32f10x_can.o obj/stm32f10x_iwdg.o obj/misc.o obj/startup_stm32f10x_md.o libgcc.a
GNU ld (GNU Binutils) 2.21
obj/main.o: In function `main':
C:\eclipse\workspace\STM32-BUS_CAN_LoopBack/main.c:85: undefined reference to `strcpy'
C:\eclipse\workspace\STM32-BUS_CAN_LoopBack/main.c:86: undefined reference to `strcmp'
make: *** [main.out] Error 1

Thanks again.

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