I am having a problem with _sbrk. In a link phase of compilation i use below comand to link my objects and i get undefined reference to _sbrk.
arm-none-eabi-ld -static -T linkerscript.ld -o exe timer_example.o /home/ziga/projects/cs_lite/arm-none-eabi/lib/libc.a /home/ziga/projects/cs_lite/lib/gcc/arm-none-eabi/4.5.1/libgcc.a
I am compiling for arm926ej-s and in ARM mode so i think i have chosen the right multilib (libc.a and libgcc.a) which is located in folder home/ziga/projects/cs_lite/arm-none-eabi/lib/.
I have been searching internet for _sbrk function and it is some sort of a memory managment call which isnt included in standard C libraries as it is dependant on microprocessor. So do I have to write _sbrk function on my own? How do I do it? Do you have any example for arm926ej-s? After writing this function I intend to compile it into an object file and link it together with other objects, libraries.
I solved this problem and will post solution here so i give something back to comunity. The function _sbrk is located inside NXP CDL package for ARM. Package is available for download (link is for all who dont know this already) here in subfolder CDL_v005/csps/lpc313x/bsps/ea3131/source you will find source file named libnosys_gnu.c which should be added to the project and compiled to object file and after that linked to executable file alongside other objects and libraries.
Best wishes and a lot of success.