linux-kernel - [PATCH v2 00/10] kbuild: userprogs: introduce architecture-specific CC_CAN

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Message-Id: <20251014-kbuild-userprogs-bits-v2-0-faeec46e887a@linutronix.de>
Date: Tue, 14 Oct 2025 15:05:15 +0200
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>, Nicolas Schier <nsc@...nel.org>, 
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>, 
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
 Heiko Carstens <hca@...ux.ibm.com>, Vasily Gorbik <gor@...ux.ibm.com>, 
 Alexander Gordeev <agordeev@...ux.ibm.com>, 
 Christian Borntraeger <borntraeger@...ux.ibm.com>, 
 Sven Schnelle <svens@...ux.ibm.com>, 
 Madhavan Srinivasan <maddy@...ux.ibm.com>, 
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>, 
 Christophe Leroy <christophe.leroy@...roup.eu>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 "David S. Miller" <davem@...emloft.net>, 
 Andreas Larsson <andreas@...sler.com>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Masahiro Yamada <masahiroy@...nel.org>, linux-riscv@...ts.infradead.org, 
 linux-s390@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org, 
 linux-mips@...r.kernel.org, sparclinux@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v2 00/10] kbuild: userprogs: introduce
 architecture-specific CC_CAN_LINK and userprog flags

The current logic to inherit -m32/-m64 from the kernel build only works
for a few architectures. It does not handle byte order differences,
architectures using different compiler flags or different kinds of ABIs.

Introduce a per-architecture override mechanism to set CC_CAN_LINK and
the flags used for userprogs.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v2:
- Rebase and drop already applied patch
- Disable CC_CAN_LINK if the test program generates warnings
- Move to architecture-specific logic
- Link to v1: https://lore.kernel.org/r/20250813-kbuild-userprogs-bits-v1-0-2d9f7f411083@linutronix.de

---
Thomas Weißschuh (10):
      kbuild: don't enable CC_CAN_LINK if the dummy program generates warnings
      init: deduplicate cc-can-link.sh invocations
      kbuild: allow architectures to override CC_CAN_LINK
      riscv: Implement custom CC_CAN_LINK
      s390: Implement custom CC_CAN_LINK
      powerpc: Implement custom CC_CAN_LINK
      MIPS: Implement custom CC_CAN_LINK
      x86/Kconfig: Implement custom CC_CAN_LINK
      sparc: Implement custom CC_CAN_LINK
      kbuild: simplify CC_CAN_LINK

 Makefile                |  8 ++++++--
 arch/mips/Kconfig       | 15 +++++++++++++++
 arch/powerpc/Kconfig    | 15 +++++++++++++++
 arch/riscv/Kconfig      | 11 +++++++++++
 arch/s390/Kconfig       | 11 +++++++++++
 arch/sparc/Kconfig      | 11 +++++++++++
 arch/x86/Kconfig        | 11 +++++++++++
 init/Kconfig            |  7 +++++--
 scripts/Kconfig.include |  3 +++
 scripts/cc-can-link.sh  |  2 +-
 10 files changed, 89 insertions(+), 5 deletions(-)
---
base-commit: 10f8210c7a7098897fcee5ca70236167b39eb797
change-id: 20250813-kbuild-userprogs-bits-03c117da4d50

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>