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

[Aleksey Laurynovich <alaur@ilbers.de>]

On Wed, 2026-09-23 at 13:49 +0000, MOESSBAUER, Felix wrote:
> 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?
v4.4.302-cip99 is also affected. It has ld rejects -Wl,-Bsymbolic-
functions, and arm64 proc.S syntax problems.

> 
> 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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> > .

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