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Re: [XEN PATCH v8 06/47] build: avoid re-executing the main Makefile by introducing build.mk
- To: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 6 Dec 2021 17:42:24 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 06 Dec 2021 16:42:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 25.11.2021 14:39, Anthony PERARD wrote:
> Currently, the xen/Makefile is re-parsed several times: once to start
> the build process, and several more time with Rules.mk including it.
> This makes it difficult to work with a Makefile used for several
> purpose, and it actually slow down the build process.
>
> So this patch introduce "build.mk" which Rules.mk will use when
> present instead of the "Makefile" of a directory. (Linux's Kbuild
> named that file "Kbuild".)
>
> We have a few targets to move to "build.mk" identified by them been
> build via "make -f Rules.mk" without changing directory.
>
> As for the main targets like "build", we can have them depends on
> there underscore-prefix targets like "_build" without having to use
> "Rules.mk" while still retaining the check for unsupported
> architecture. (Those main rules are changed to be single-colon as
> there should only be a single recipe for them.)
>
> With nearly everything needed to move to "build.mk" moved, there is a
> single dependency left from "Rules.mk": the variable $(TARGET), so its
> assignement is moved to the main Makefile.
>
> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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