[Xen-devel] [RFC] build configuration

[Hollis Blanchard <hollisb@xxxxxxxxxx>]

For the PowerPC merge, one of the issues we're going to run into is build 
configuration. Currently we have things hacked in the PPC tree, but I think 
this is an opportunity to clean up the existing build options.

I started looking at just the xen subdirectory, and found the following 
options scattered beneath there:
    verbose
    debug
    perfc
    perfc_arrays
    crash_debug
    ACM_SECURITY
    XEN_TARGET_X86_PAE
    pae
    supervisor_mode_kernel
    VALIDATE_VT

All of these are truly optional, in that everything builds just fine no matter 
what they are set to. I would like to consolidate these into a single 
top-level config file. The Linux configuration style is what I know best, so 
following that model we would have a collection of default configurations, 
which are copied and then modified to the user's preference (I'm thinking 
with a text editor, at least for now).

I'm not looking to drag in Linux's Kbuild system, but a top-level text file 
full of
    CONFIG_FOO = y
would be converted into a Make include file and a header file.

Later, I would like to use the same system for non-optional things. For 
example, PowerPC would set "CONFIG_ACPI = n", while the other architectures 
would set it to y.

Thoughts? Has anybody else looked at this? Is there anybody in particular who 
knows the current build system relatively well?

-- 
Hollis Blanchard
IBM Linux Technology Center

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