[klibc] [PATCH/RFC] klibc/kbuild: use separate kbuild files for each klibc subdirectory

[H. Peter Anvin]

Sam Ravnborg wrote:
> This fixes a long standing issue where it was not possible to
> do "make usr/klibc/arch/x86_64/longjmp.o" in the kernel.
> 
> The principle is that all .o files to be part of klibc are listed
> with klib-y. For each directory a klib.list file is made that specify
> all .o file and the final AR then adds all .o files to create libc.a.
> 
> This patch introduce the infrastructure and converts x86_64 to use it.
> And it breaks all other architectures...
> 

This looks like The Right Thing to me, for sure.  With two examples 
(x86_64 and i386) it shouldn't be too hard to fix up the remaining 
architectures.

	-hpa