Xen devel - Nov 2006 - [PATCH] mini-os: New makefile structure for different architectures

Hi Gregor,
> Yes, having Makefiles in each subdirectory is the way to go. The only
> reason we have one is that historically everything lived in mini-os
I tried a complete rewrite of the make structure for mini-os to get better 
support for different architectures (for me ia64).
Please have a look at it and give your comments. It''s really needed to
get
publish the ia64 mini-os.
Thanks.

Dietmar.


Following structure:
 mini-os/Makefile   - common makefile.
 mini-os/mini-os.mk - common makerules.
 arch/x86/Makefile  - x86 family special makefile
 arch/x86/arch.mk   - x86 family special make rules
 arch/ia64/Makefile - ia64 family special makefile
 arch/ia64/arch.mk  - ia64 family special make rules

On start of make (with common makefile) tries to extract the correct 
architecture and sets up (and exports) some variables.
TARGET_ARCH     - x86_32 or x86_64 or ia64 or ...
TARGET_ARCH_FAM - x86 (for x86_32, ...) or ia64 or ...
TARGET_ARCH_DIR - arch/x86 or arch/ia64 or ...
MINI-OS_ROOT    - The complete path to mini-os directory.

It includes the architecture specific arch.mk and mini-os.mk
With both the make flags are built.

It tries to build libminios.a from
mini-os/*.c
console/*.c
xenbus/*.c
This is done like in the old make structure.

It goes to the arch/... directory and starts the special architecture 
Makefile, which must build the architecture specific library (e.g. 
libx86_32.a or libia64.a)
This Makefile includes the architecture special makerules file arch.mk and the 
global rule file ../../mini-os.mk 

All architecture specific files are moved to the arch/... directory. This 
includes the linker script minios-*.lds and the assembler file with the 
_start function (e.g. x86_32.S). In the new make structure this file is 
handled separatly in the makerules to get it right on linking (see 
HEAD_ARCH_OBJ and HEAD_ARCH in minios.mk).




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