linux-kernel - [RFC 0/2] Kbuild: Support nested composite objects

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Date:   Fri, 22 Jan 2021 11:27:16 -0800
From:   Elliot Berman <eberman@...eaurora.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     Elliot Berman <eberman@...eaurora.org>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        Michal Marek <michal.lkml@...kovi.net>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Trilok Soni <tsoni@...eaurora.org>,
        Mahesh Kumar Kalikot Veetil <mkalikot@...eaurora.org>,
        Jeff Johnson <jjohnson@...eaurora.org>
Subject: [RFC 0/2] Kbuild: Support nested composite objects

This series was developed after discussion in https://lkml.org/lkml/2021/1/19/850

The motivation for this series is an out-of-tree module which contains a large
number of source files. This causes Kbuild to exceed the maximum command line
argument length when linking the files. Proposal here permits composite objects
to contain other composite objects. This allows the driver to split linking into
several steps and avoid the maximum command line length error.

Kbuild composite objects only supports one level of composite objects.
That is, a composite object may only be composed of real compilable
source files.

As a simple example, the following Kbuild description is now supported:

bar-a-y := a/bar0.o a/bar1.o
bar-b-y := b/bar2.o b/bar3.o

foo-objs := bar-a.o bar-b.o

obj-m += foo.o

Add such support by recursively searching for composite objects and
listing them in $(multi-used-*) and $(real-obj-*).

Elliot Berman (2):
  Kbuild: Make composite object searching more generic
  Kbuild: Support nested composite objects

 scripts/Makefile.lib | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

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