linux-kernel - [PATCH v2 00/11] kbuild: support building external modules in a separate build directory

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Message-ID: <20241110013649.34903-1-masahiroy@kernel.org>
Date: Sun, 10 Nov 2024 10:34:28 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	rust-for-linux@...r.kernel.org,
	cocci@...ia.fr,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: [PATCH v2 00/11] kbuild: support building external modules in a separate build directory


There has been a long-standing request to support building external
modules in a separate build directory.

In v2, 05/11 introduces a 'srcroot' variable.
(I am not sure if this is the best name, though)
$(srcroot) points to the top of the source directory.
  - When M= is not given, it is the top of the kernel source
  - When M= is given, it is the top of the external module source


Masahiro Yamada (11):
  kbuild: replace two $(abs_objtree) with $(CURDIR) in top Makefile
  kbuild: add $(objtree)/ prefix to some in-kernel build artifacts
  kbuild: rename abs_objtree to abs_output
  kbuild: use 'output' variable to create the output directory
  kbuild: change working directory to external module directory with M=
  kbuild: remove extmod_prefix, MODORDER, MODULES_NSDEPS variables
  kbuild: support building external modules in a separate build
    directory
  kbuild: support -fmacro-prefix-map for external modules
  kbuild: use absolute path in the generated wrapper Makefile
  kbuild: make wrapper Makefile more convenient for external modules
  kbuild: allow to start building external modules in any directory

 Documentation/dev-tools/coccinelle.rst |  20 +--
 Documentation/kbuild/kbuild.rst        |   8 +-
 Documentation/kbuild/makefiles.rst     |  14 ++
 Documentation/kbuild/modules.rst       |  29 ++++-
 Makefile                               | 173 ++++++++++++++++---------
 arch/arm/Makefile                      |   4 +-
 arch/arm64/Makefile                    |   2 +-
 arch/powerpc/Makefile                  |   4 +-
 arch/riscv/Makefile                    |   2 +-
 rust/Makefile                          |   4 +-
 scripts/Kbuild.include                 |   2 +-
 scripts/Makefile.build                 |   6 +-
 scripts/Makefile.clean                 |   2 +-
 scripts/Makefile.compiler              |   2 +-
 scripts/Makefile.host                  |   8 +-
 scripts/Makefile.lib                   |   2 -
 scripts/Makefile.modfinal              |  20 +--
 scripts/Makefile.modinst               |   8 +-
 scripts/Makefile.modpost               |  24 ++--
 scripts/coccicheck                     |   6 +-
 scripts/depmod.sh                      |   4 +-
 scripts/nsdeps                         |  10 +-
 scripts/package/install-extmod-build   |   7 +
 23 files changed, 220 insertions(+), 141 deletions(-)

-- 
2.43.0