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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 15 Mar 2006, at 18:01, Hollis Blanchard wrote:

> 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.
Well, let's start by fixing your current need, which is for the 
non-optional config parameters, and see how that pans out. Some general 
cleaning up of the build system would be good and can probably be done 
by a set of consecutive patches rather than a 'big bang' approach.
For example, I don't think using GNU make's wildcards has worked well 
for working out what files to build, as we end up needing gross 
patsubst's to remove the files that are not to be included in the 
current build. Just explicitly listing the files to build would be 
better imo. If we could do that and also have Linux-style OBJ-<foo> 
style then that would be nice.
Do you want to cook up some tentative patches? Small increments are 
good as build systems tend to be fragile beasts, and ours is no 
exception. :-)
 -- Keir


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