Need help with multiple C files

[moondeck]

So, can anyone help me with this error after compiling the kernel with my cross compiler?

Code: Select all

nasm -f elf32 kernelld.asm -o k.o
i686-elf-gcc -m32 -c kernelio/kernelio.c
i686-elf-gcc -m32 -c kernel.c
i686-elf-gcc -m32 -o kernel_main.o kernel.o kernelio.o
/home/moondeck/ccompiler/lib/gcc/i686-elf/5.3.0/../../../../i686-elf/bin/ld: cannot find crt0.o: No such file or directory
/home/moondeck/ccompiler/lib/gcc/i686-elf/5.3.0/../../../../i686-elf/bin/ld: cannot find -lc
collect2: error: ld returned 1 exit status
makefile:2: recipe for target 'kernel' failed
make: *** [kernel] Error 1

[Combuster]

Remove "-m32", add "-ffreestanding".

A kernel is not an userspace application. You'll probably want a linker script as well.

[moondeck]

Remove "-m32", add "-ffreestanding".

A kernel is not an userspace application. You'll probably want a linker script as well.

I do have a linker script, i think i have included it in the first post, didnt i?
EDIT: Nope, its here:

Code: Select all

OUTPUT_FORMAT(elf32-i386)
ENTRY(begin)
SECTIONS
 {
   . = 0x100000;
   .text : { *(.text) }
   .data : { *(.data) }
   .bss  : { *(.bss)  }
 }

[Combuster]

What good is a linker script if you're not using it?

Also, you made the Strings do not work beginner mistake.

[moondeck]

What good is a linker script if you're not using it?

Also, you made the Strings do not work beginner mistake.

How can i not be using it if its in my makefile?

Code: Select all

kernel:
	nasm -f elf32 kernelld.asm -o k.o
	i686-elf-gcc -m32 -c kernelio/kernelio.c
	i686-elf-gcc -m32 -c kernel.c
	i686-elf-gcc -m32 -o kernel_main.o kernel.o kernelio.o
	i686-elf-ld -m elf_i386 -T kernel.ld -o kernel k.o kernel_main.o

Also, the code WORKED before a part of it to kernelio.c and using a cross compiler.

[Combuster]

Have you ever manually used a linker on the command line for any reasonably-sized project? You don't seem to understand how the process of compiling and linking is supposed to work (hint: your makefile calls the linker twice).

In addition, I hardly see you fix anything mentioned so far.

[moondeck]

Have you ever manually used a linker on the command line for any reasonably-sized project? You don't seem to understand how the process of compiling and linking is supposed to work (hint: your makefile calls the linker twice).

In addition, I hardly see you fix anything mentioned so far.

Nope, never used it, i dont really know how it should be configured. I have only programmed microcontrollers before, and it did not require manual linking

[iansjack]

(hint: your makefile calls the linker twice).

To be strictly accurate, it will only ever call the linker once, but there are two entries for the linker in the makefile.

[Roman]

You should learn, how your tools work. Take a look at the gcc man page.