[PATCH 00/12] 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 build system in macOS hosts.

Since macOS does not provide some of the headers available in the GNU
C Library (glibc), the patches include a copy of these headers from
glibc-2.40, with minor modifications detailed in the commit message.

To set up the environment:

* Provide build dependencies (installed via Homebrew):

	coreutils, findutils, gnu-sed, gnu-tar, grep, llvm, make and pkg-config.

* A case sensitive volume for building:

	diskutil apfs addVolume /dev/disk<N> "Case-sensitive APFS" linux

* And include in your PATH all GNU tools required by the Linux kernel as
well as LLVM:

	PATH="/opt/homebrew/opt/coreutils/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/findutils/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/gnu-sed/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/gnu-tar/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/grep/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/make/libexec/gnubin:$PATH"
	PATH="/opt/homebrew/opt/llvm/bin:$PATH"

* Start the build using LLVM:

	make LLVM=1 allyesconfig
	make LLVM=1 -j$(nproc)

I believe other architectures could also be supported if we can move
forward this initiative. Additionally, we could incorporate Rust
support. I understand that Finn Behrens has some patches [4][5] based on
Nick's previous work.

[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@gmail.com/

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

[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 at kernel.org>
To: Nathan Chancellor <nathan at kernel.org>
To: Nicolas Schier <nicolas at fjasle.eu>
To: Lucas De Marchi <lucas.demarchi at intel.com>
To: Thomas Hellström <thomas.hellstrom at linux.intel.com>
To: Rodrigo Vivi <rodrigo.vivi at intel.com>
To: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
To: Maxime Ripard <mripard at kernel.org>
To: Thomas Zimmermann <tzimmermann at suse.de>
To: David Airlie <airlied at gmail.com>
To: Daniel Vetter <daniel at ffwll.ch>
To: William Hubbs <w.d.hubbs at gmail.com>
To: Chris Brannon <chris at the-brannons.com>
To: Kirk Reiser <kirk at reisers.ca>
To: Samuel Thibault <samuel.thibault at ens-lyon.org>
To: Paul Moore <paul at paul-moore.com>
To: Stephen Smalley <stephen.smalley.work at gmail.com>
To: Ondrej Mosnacek <omosnace at redhat.com>
To: Catalin Marinas <catalin.marinas at arm.com>
To: Will Deacon <will at kernel.org>
To: Marc Zyngier <maz at kernel.org>
To: Oliver Upton <oliver.upton at linux.dev>
To: James Morse <james.morse at arm.com>
To: Suzuki K Poulose <suzuki.poulose at arm.com>
To: Zenghui Yu <yuzenghui at huawei.com>
To: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
To: Jiri Slaby <jirislaby at kernel.org>
To: Nick Desaulniers <ndesaulniers at google.com>
To: Bill Wendling <morbo at google.com>
To: Justin Stitt <justinstitt at google.com>
Cc: linux-kernel at vger.kernel.org
Cc: linux-kbuild at vger.kernel.org
Cc: intel-xe at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Cc: speakup at linux-speakup.org
Cc: selinux at vger.kernel.org
Cc: linux-arm-kernel at lists.infradead.org
Cc: kvmarm at lists.linux.dev
Cc: linux-serial at vger.kernel.org
Cc: llvm at lists.linux.dev
Cc: Finn Behrens <me at kloenk.dev>
Cc: Daniel Gomez (Samsung) <d+samsung at kruces.com>
Cc: gost.dev at samsung.com

Signed-off-by: Daniel Gomez <da.gomez at samsung.com>
---
Daniel Gomez (11):
      kbuild: add header_install dependency to scripts
      file2alias: fix uuid_t definitions for macos
      drm/xe: xe_gen_wa_oob: fix program_invocation_short_name for macos
      accessiblity/speakup: genmap and makemapdata require linux/version.h
      selinux/genheaders: include bitsperlong and posix_types headers
      selinux/mdp: include bitsperlong and posix_types headers
      include: add elf.h support
      include: add endian.h support
      scripts/mod: add byteswap support
      tty/vt: conmakehash requires linux/limits.h
      scripts/kallsyms: add compatibility support for macos

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

 Makefile                               |    2 +-
 arch/arm64/kernel/pi/Makefile          |    1 +
 arch/arm64/kernel/vdso32/Makefile      |    1 +
 arch/arm64/kvm/hyp/nvhe/Makefile       |    2 +-
 drivers/accessibility/speakup/Makefile |    2 +
 drivers/gpu/drm/xe/xe_gen_wa_oob.c     |    8 +-
 drivers/tty/vt/Makefile                |    1 +
 include/byteswap/byteswap.h            |   35 +
 include/elf/elf.h                      | 4491 ++++++++++++++++++++++++++++++++
 include/endian/bits/uintn-identity.h   |   48 +
 include/endian/endian.h                |   63 +
 scripts/Makefile                       |    3 +-
 scripts/kallsyms.c                     |    4 +
 scripts/mod/Makefile                   |    6 +
 scripts/mod/file2alias.c               |    3 +
 scripts/selinux/genheaders/Makefile    |    3 +-
 scripts/selinux/mdp/Makefile           |    3 +-
 scripts/subarch.include                |    3 +-
 18 files changed, 4672 insertions(+), 7 deletions(-)
---
base-commit: 1e391b34f6aa043c7afa40a2103163a0ef06d179
change-id: 20240807-macos-build-support-9ca0d77adb17

Best regards,
-- 
Daniel Gomez <da.gomez at samsung.com>