Error linking when including header files with barebones

[billy]

Hello.

I've followed the barebones tutorial and got it to run in qemu. Now i'm trying to put some code in another file, test.{h,c}, but i get an error linking. There are no errors/messages compiling kernel.c. The error i get is:

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/home/billy/opt/cross/lib/gcc/i686-elf/13.2.0/../../../../i686-elf/bin/ld: ../obj/kernel.o: in function `kernel_main':
kernel.c:(.text+0x445): undefined reference to `TestFunc'
collect2: error: ld returned 1 exit status

and the command i'm running is

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i686-elf-gcc -T ../linker.ld -o ../bin/kernel.bin -ffreestanding -O2 -nostdlib ../obj//kernel.o -lgcc

Everything else is the same as the barebones tutorial.
Any help would be appreciated.

Thanks!

[klange]

You are building a separate object file and then not including it when you link. You must include all object files in your final link.