After writing a bootloader and getting it to jump to a Hello
World "kernel" written in assembly, I want to give it a go with a
"kernel" written in D. I'm using GDC because I didn't have much
luck with making DMD skip the D runtime and standard libs.
Starting with this code:
void main() { }
Compiling it like this:
i686-gdcproject-mingw32-gdc.exe kernel.d -o
"../bin/kernel.bin" -nophoboslib -nostdlib -s
This is the output:
kernel.d:(.text+0xa): undefined reference to `__main'
kernel.d:(.text+0x24): undefined reference to `_d_run_main'
(.text+0x38): undefined reference to `_Dmodule_ref'
(.text+0x43): undefined reference to `_Dmodule_ref'
According to
http://stackoverflow.com/questions/13573289/how-to-compile-d-application-without-the-d-runtime
I need something more like this:
extern(C) __gshared void* _Dmodule_ref;
extern(C) int main() { return 0; }
Now this is the output:
kernel.d:(.text+0x7): undefined reference to `__main'
So I have two problems here. The first one is that it's not
working. The second one is that I'm copy pasting code, and
perhaps by trying a bunch of variations I'll manage to get
something that compiles, but I probably still won't understand
what I'm doing and why it does or does not work.
Now I'm hoping that someone can give me a hand with working code,
and also explain the reasoning behind it.
