Re: [XEN PATCH 15/15] build: remove Config.mk include from Rules.mk

[Luca Fancellu]

> On 23 May 2023, at 17:38, Anthony PERARD <anthony.per...@citrix.com> wrote:
> 
> Everything needed to build the hypervisor should already be configured
> by "xen/Makefile", thus Config.mk shouldn't be needed.
> 
> Then, Config.mk keeps on testing support of some CFLAGS with CC, the
> result of this testing is not used at this stage so the build is
> slowed unnecessarily.
> 
> Likewise, GCC is checked to be at the minimum at 4.2 when entering
> every sub-directory, so the check have run countless time at this
> stage.
> 
> We only need to export a few more configuration variables. And add
> some variables in Kbuild.include, and macro fallbacks for Make older
> than 3.81. (Adding `or` just in case. it's only used in xen/Makefile,
> which includes Config.mk and so has already the fallback.)
> 
> Signed-off-by: Anthony PERARD <anthony.per...@citrix.com>
> ---

Reviewed-by: Luca Fancellu <luca.fance...@arm.com>
Tested-by: Luca Fancellu <luca.fance...@arm.com>