[PATCH v2 0/8] Enable build system on macOS hosts

[Daniel Gomez via B4 Relay]

This patch set allows for building the Linux kernel for arm64 in macOS
with LLVM.

Patches are based on previous Nick's work and suggestions [1][2][3] to
enable the Linux kernel build system on macOS hosts.

macOS does not provide certain headers that are available in a GNU/Linux
distribution with development headers installed, usually provided by
the GNU C Library (glibc) and/or other projects. These missing headers
are needed as build dependencies. To address this, the patches depend
on a new Bee Headers Homebrew Tap formula [6][7][8] that provides them
together with a pkg-config file to locate the include directory.

To locate them, Makefiles include something like:
	$(shell $(HOSTPKG_CONFIG) --cflags bee-headers 2> /dev/null)

[6] Project:
https://github.com/bee-headers
[7] Headers repository:
https://github.com/bee-headers/headers.git
[8] Homebrew Tap formula:
https://github.com/bee-headers/homebrew-bee-headers.git

To set up the environment, documentation is provided via last patch in
this series.

More configurations and architectures as well as support for Rust
(from Finn Behrens [4] [5]) can be added in the future to extend build
support.

[1]: WIP: build Linux on MacOS
https://github.com/ClangBuiltLinux/linux/commit/f06333e29addbc3d714adb340355f471c1dfe95a

[2] Subject: [PATCH] scripts: subarch.include: fix SUBARCH on MacOS hosts
https://lore.kernel.org/all/20221113233812.36784-1-nick.desaulniers@xxxxxxxxx/

[3] Subject: Any interest in building the Linux kernel from a MacOS host?
https://lore.kernel.org/all/CAH7mPvj64Scp6_Nbaj8KOfkoV5f7_N5L=Tv5Z9zGyn5SS+gsUw@xxxxxxxxxxxxxx/

[4] https://github.com/kloenk/linux/commits/rust-project_macos-dylib/

[5] https://kloenk.eu/posts/build-linux-on-m1-macos/

To: Masahiro Yamada <masahiroy@xxxxxxxxxx>
To: Nathan Chancellor <nathan@xxxxxxxxxx>
To: Nicolas Schier <nicolas@xxxxxxxxx>
To: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
To: Thomas Hellström <thomas.hellstrom@xxxxxxxxxxxxxxx>
To: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
To: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
To: Maxime Ripard <mripard@xxxxxxxxxx>
To: Thomas Zimmermann <tzimmermann@xxxxxxx>
To: David Airlie <airlied@xxxxxxxxx>
To: Daniel Vetter <daniel@xxxxxxxx>
To: William Hubbs <w.d.hubbs@xxxxxxxxx>
To: Chris Brannon <chris@xxxxxxxxxxxxxxxx>
To: Kirk Reiser <kirk@xxxxxxxxxx>
To: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
To: Paul Moore <paul@xxxxxxxxxxxxxx>
To: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
To: Ondrej Mosnacek <omosnace@xxxxxxxxxx>
To: Catalin Marinas <catalin.marinas@xxxxxxx>
To: Will Deacon <will@xxxxxxxxxx>
To: Marc Zyngier <maz@xxxxxxxxxx>
To: Oliver Upton <oliver.upton@xxxxxxxxx>
To: James Morse <james.morse@xxxxxxx>
To: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
To: Zenghui Yu <yuzenghui@xxxxxxxxxx>
To: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
To: Jiri Slaby <jirislaby@xxxxxxxxxx>
To: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
To: Bill Wendling <morbo@xxxxxxxxxx>
To: Justin Stitt <justinstitt@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: linux-kbuild@xxxxxxxxxxxxxxx
Cc: intel-xe@xxxxxxxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: speakup@xxxxxxxxxxxxxxxxx
Cc: selinux@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: kvmarm@xxxxxxxxxxxxxxx
Cc: linux-serial@xxxxxxxxxxxxxxx
Cc: llvm@xxxxxxxxxxxxxxx
Cc: Finn Behrens <me@xxxxxxxxxx>
Cc: Daniel Gomez (Samsung) <d+samsung@xxxxxxxxxx>
Cc: gost.dev@xxxxxxxxxxx

Signed-off-by: Daniel Gomez <da.gomez@xxxxxxxxxxx>
---
Changes in v2:
- Add documentation and set this 'feature' as experimental.
- Update cover letter.
- Drop unnecessary changes. Patches removed:
	- kbuild: add header_install dependency to scripts
	- include: add endian.h support
	- include: add elf.h support
- Update Makefiles to find Bee Headers with pkg-config.
- Update file2alias to solve uuid_t conflicts inside Makefile as
suggested by Nicolas Schier.
- Adapt xe_gen_wa_oob to solve getprogname()/
program_invocation_short_name in runtime. as suggested by Lucas De
Marchi.
- Remove linux/version.h in accessibility/speakup as suggested by
Masahiro Yamada.
- Replace selinux patches with new Masahiro Yamada's patches:
	Message-id: 20240809122007.1220219-1-masahiroy@xxxxxxxxxx
	Link: https://lore.kernel.org/all/20240809122007.1220219-1-masahiroy@xxxxxxxxxx/
- Replace tty/vt with new Masahiro Yamada's patch:
	Message-id: 20240809160853.1269466-1-masahiroy@xxxxxxxxxx
	Link: https://lore.kernel.org/all/20240809160853.1269466-1-masahiroy@xxxxxxxxxx/
	(Already merged in the linux-next tag used)
- Replace scripts/kallsyms patch with Masahiro Yamada's patch:
	Message-id: 20240807181148.660157-1-masahiroy@xxxxxxxxxx
	Link: https://lore.kernel.org/all/20240807181148.660157-1-masahiroy@xxxxxxxxxx/
	(Already merged in the linux-next tag used)
- Link to v1: https://lore.kernel.org/r/20240807-macos-build-support-v1-0-4cd1ded85694@xxxxxxxxxxx

---
Daniel Gomez (5):
      file2alias: fix uuid_t definitions for macos
      drm/xe: xe_gen_wa_oob: fix program_invocation_short_name for macos
      arm64: nvhe: add bee-headers support
      scripts: add bee-headers support
      Documentation: add howto build in macos

Masahiro Yamada (2):
      selinux: do not include <linux/*.h> headers from host programs
      selinux: move genheaders to security/selinux/

Nick Desaulniers (1):
      scripts: subarch.include: fix SUBARCH on macOS hosts

 Documentation/kbuild/llvm.rst                      | 78 ++++++++++++++++++++++
 arch/arm64/kernel/pi/Makefile                      |  1 +
 arch/arm64/kernel/vdso32/Makefile                  |  1 +
 arch/arm64/kvm/hyp/nvhe/Makefile                   |  3 +-
 drivers/gpu/drm/xe/xe_gen_wa_oob.c                 |  4 ++
 scripts/Makefile                                   |  4 +-
 scripts/mod/Makefile                               |  7 ++
 scripts/mod/file2alias.c                           |  3 +
 scripts/remove-stale-files                         |  3 +
 scripts/selinux/Makefile                           |  2 +-
 scripts/selinux/genheaders/.gitignore              |  2 -
 scripts/selinux/genheaders/Makefile                |  5 --
 scripts/selinux/mdp/Makefile                       |  2 +-
 scripts/selinux/mdp/mdp.c                          |  4 --
 scripts/subarch.include                            |  2 +-
 security/selinux/.gitignore                        |  1 +
 security/selinux/Makefile                          |  7 +-
 .../genheaders => security/selinux}/genheaders.c   |  3 -
 security/selinux/include/classmap.h                | 19 ++++--
 security/selinux/include/initial_sid_to_string.h   |  2 -
 20 files changed, 123 insertions(+), 30 deletions(-)
---
base-commit: ad40aff1edffeccc412cde93894196dca7bc739e
change-id: 20240807-macos-build-support-9ca0d77adb17

Best regards,
-- 
Daniel Gomez <da.gomez@xxxxxxxxxxx>