''undefined reference to _sbrk'' error ( yagarto )

[mehmet.karakaya]

Posted on December 06, 2012 at 17:09

hello dear forum,

I am trying to compile a C program for STM32F4 microcontroller with yagarto I have run into following error

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c:/olimexods/yagarto/bin/../lib/gcc/arm-none-eabi/4.5.1/../../../../arm-none-eabi/lib\libg.a(lib_a-sbrkr.o): In function `_sbrk_r':

C:\msys\1.0\home\yagarto\newlib-build\arm-none-eabi\newlib\libc\reent/../../../../../newlib-1.18.0/newlib/libc/reent/sbrkr.c:60: undefined reference to `_sbrk'

 

 

 

 

 

 

 

I have been told to implement this sbrk by myself

If only I knew anything about it! :(

becouse of this I first decided to ask in the forum if somebody

faced this error before ?

now my question

did anybody face this error before ?

how did you solve it ?

or could you solve it ?

thanks

#yagarto-newlib

[Tesla DeLorean]

Posted on December 06, 2012 at 17:30

Presumably because you're calling things like malloc()/free()?

Look at how tools like Atollic implement syscalls.c

STM32F0xx_AN4065_FW_V1.0.0\Project\STM32F0xx_IAP\binary_template\TrueSTUDIO\STM320518_EVAL\syscalls.c

Or a basic Google/Bing search, yielding

http://www.yagarto.de/download/yagarto/syscalls.c