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Re: [Xen-devel] [RFC] build configuration

On Wednesday 15 March 2006 11:44, Keir Fraser wrote:
> So far we've kept the number of 'user serviceable' build options very 
> small, preferring to select optional things at run time, and specify 
> non-optional things by hardcoding in asm/config.h.
> What is it that PPC requires in addition to this? If it's the ability 
> to more easlly have those config.h hardcodings affect what files get 
> built, then maybe we can pull out those hardcoded CONFIG_ items into a 
> per-arch text file that gets processed into a header file and into a 
> Makefile include.

Yup, that's exactly what it is. While I was looking into that, I noticed that 
the build options are a little disorganized, and it could be nice to have 
them all collected in one place.

Further, it would clean up some of the existing makefiles. For example:
        ifeq ($(XEN_TARGET_ARCH),x86_64)
        LIBDIR = lib64
        LIBDIR = lib
Instead of that, just "include Config-$(XEN_TARGET_ARCH).mk" and let it set 

Now think about ACPI: most archs want it right now, but PPC doesn't. Rather 
than have lots of ifeq elif elif ... in xen/drivers/Makefile, it would be far 
simpler to do:
        OBJS-$(CONFIG_ACPI) += acpi
and let Config-$(XEN_TARGET_ARCH).mk set CONFIG_ACPI or not.

Hollis Blanchard
IBM Linux Technology Center

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