Re: [PATCH] fix: Add toolchain fixes to linux-cip 4.4 kernel on Noble

["'MOESSBAUER, Felix' via isar-users" <isar-users@googlegroups.com>]

On Wed, 2026-09-23 at 14:03 +0200, Aleksey Laurynovich wrote:
> Older kernel (4.4.x) has three toolchain issues on Ubuntu Noble:
> - dtc yylloc multiple definition (fixed by HOSTCFLAGS+=-fcommon)
> - ld rejects -Wl,-Bsymbolic-functions (fixed by clearing LDFLAGS)
> - arm64 proc.S uses deprecated .section syntax rejected by binutils 2.42
>   (fixed by patching to use modern 'ax' flags)
> 
> The issue can be reproduced with the command:
> $ bitbake mc:qemuarm64-noble:linux-cip-arm64
> 
> Signed-off-by: Aleksey Laurynovich <alaur@ilbers.de>
> ---
>  ...rm64-proc.S-fix-binutils-2.42-section-syntax.patch | 11 +++++++++++
>  .../recipes-kernel/linux/linux-cip_4.4.166-cip29.bb   |  6 ++++++
>  2 files changed, 17 insertions(+)
>  create mode 100644 meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
> 
> diff --git a/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch b/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
> new file mode 100644
> index 00000000..f464ac40
> --- /dev/null
> +++ b/meta-isar/recipes-kernel/linux/files/0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch
> @@ -0,0 +1,11 @@
> +--- a/arch/arm64/mm/proc.S
> ++++ b/arch/arm64/mm/proc.S
> +@@ -152,7 +152,7 @@
> + alternative_endif
> + ENDPROC(cpu_do_switch_mm)
> + 
> +-	.section ".text.init", #alloc, #execinstr
> ++	.section ".text.init", "ax"
> + 
> + /*
> +  *	__cpu_setup
> diff --git a/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb b/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb

This kernel patch release is quite old. Did you check if v4.4.302-cip99
is also affected?

Felix

> index e2e51304..4b606dee 100644
> --- a/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb
> +++ b/meta-isar/recipes-kernel/linux/linux-cip_4.4.166-cip29.bb
> @@ -9,8 +9,14 @@ PN .= "-${DISTRO_ARCH}"
>  
>  inherit linux-kernel
>  
> +# Older kernel dtc has yylloc multiple definition, fixed by -fcommon
> +KERNEL_EXTRA_BUILDARGS += "HOSTCFLAGS+=-fcommon"
> +# Older kernel passes -Wl,-Bsymbolic-functions to cross-linker which rejects it
> +KERNEL_EXTRA_BUILDARGS += "LDFLAGS="
> +
>  SRC_URI += " \
>      git://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git;protocol=https;branch=linux-4.4.y-cip;destsuffix=${P} \
> +    file://0001-arm64-proc.S-fix-binutils-2.42-section-syntax.patch \
>  "
>  
>  SRCREV = "af3adf9f9c633ac0e1d68487d7fad22285dda8a3"
> -- 
> 2.43.0
> 
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