linux-kernel - [PATCH v3 0/3] kbuild: userprogs: introduce architecture-specific CC_CAN

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Message-Id: <20251114-kbuild-userprogs-bits-v3-0-4dee0d74d439@linutronix.de>
Date: Fri, 14 Nov 2025 14:43:55 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: Nicolas Schier <nsc@...nel.org>, Nathan Chancellor <nathan@...nel.org>, 
 Nicolas Schier <nicolas.schier@...ux.dev>
Cc: linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH v3 0/3] 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.
This revision only contains the generic kbuild infrastructure bits.
The architecture-specific will go through the architecture trees.
They are present in v2 of the series linked below.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
Changes in v3:
- Drop all architecture-specific patches, they will go in through the architecture trees.
- Trim recipient list.
- Fix old reference to CONFIG_ARCH_USERPROGS_CFLAGS
- Link to v2: https://lore.kernel.org/r/20251014-kbuild-userprogs-bits-v2-0-faeec46e887a@linutronix.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 (3):
      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

 Makefile                | 13 +++++++++++--
 init/Kconfig            |  8 ++++++--
 scripts/Kconfig.include |  3 +++
 scripts/cc-can-link.sh  |  2 +-
 4 files changed, 21 insertions(+), 5 deletions(-)
---
base-commit: 10f8210c7a7098897fcee5ca70236167b39eb797
change-id: 20250813-kbuild-userprogs-bits-03c117da4d50

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