Question

I’m trying to get a “Hello World” application compiled for an ARM target. I’m cross compiling using gcc on Ubuntu/VMWare. If I compile for the host machine, it works fine. When I compile for the target, I get this error:

/root/picokernel/toolchain/arm-eabi/lib/libcs3hosted.a(hosted-sbrk.o): In function `_sbrk':
sbrk.c:(.text+0x74): undefined reference to `__cs3_heap_limit'
/root/picokernel/toolchain/arm-eabi/lib/libcs3hosted.a(hosted-sbrk.o):(.data+0x0): undefined reference to `__cs3_heap_start'
make: *** [HelloWorld] Error 1

So I think I need to link something in – perhaps my toolchain does not have the right libs? I was able to build the kernel, so I thought it was complete. Thanks! This is the target board. – runs Angstrom or Android.

makefile:

CC=$(CROSS_COMPILE)gcc
LD=$(CROSS_COMPILE)ld 
CROSS_LIB1=/root/picokernel/toolchain/arm-eabi/lib 
CROSS_LIB2=/root/picokernel/toolchain/lib/gcc/arm-eabi/4.2.1
CFLAGS=-Wall
LDFLAGS= -L$(CROSS_LIB1) -L$(CROSS_LIB2) -lc -lcs3hosted -lg -lgcc --entry main
HelloWorld: HelloWorld.o 
    $(LD) HelloWorld.o $(LDFLAGS)

clean:
rm -f HelloWorld HelloWorld.o

program:

#include <stdio.h>

int main(int argc, char **argv)
{
   printf("Hello World\n");
   return 0;
}

Answer 1

Ok – finally worked this out, picked up a toolchain from the source here:

http://www.codesourcery.com/sgpp/lite/arm/portal/release1803

Hello World works great! Thanks for the suggestions