On Mon, Jul 7, 2026, Harish Sadineni wrote:
> Convert the existing GCC tool definitions to use the `:toolchain-gcc`
> override so they only apply when `TOOLCHAIN = "gcc"` (the default).
I went through the series with a focus on making sure it's a no-op for the
common gcc / non-riscv64 kernel build, and it checks out:
- toolchain-gcc lands in OVERRIDES for a default build (base.bbclass does
inherit_defer toolchain/${TOOLCHAIN}, gcc.bbclass sets
TCOVERRIDE = "toolchain-gcc", and OVERRIDES carries ${TCOVERRIDE}), so
KERNEL_CC:toolchain-gcc et al resolve to exactly what the unconditional
assignments produced before.
- The KERNEL_CC:append:{aarch64,nios2,arc} appends in linux-yocto.inc still
stack correctly on top of the :toolchain-gcc value, so the arch-specific
TOOLCHAIN_OPTIONS aren't lost.
- Patches 2-4 are gated to riscv64 and/or the rust KERNEL_FEATURE
(kernel-yocto-rust.bbclass is only inherited when 'rust' is set), so
they're inert everywhere else.
For the whole series:
Acked-by: Bruce Ashfield <[email protected]>
Two things worth noting, neither blocking:
- One behavioural subtlety from this conversion: a KERNEL_CC:toolchain-gcc
assignment now outranks any *unconditional* KERNEL_CC = "..." a downstream
BSP might set, where previously it was a plain last-assignment-wins. No
in-tree machine/recipe does that today, so there's no regression, but it's
a change in precedence worth being aware of if a BSP overrides these.
- In patch 4, `if 'clang' in toolchain:` will throw if TOOLCHAIN is ever
unset (getVar returns None). It's always set for kernel recipes today so
it's fine, but `d.getVar('TOOLCHAIN') or ''` would be a touch more robust.
Bruce
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