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

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

[Aleksey Laurynovich]

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

['MOESSBAUER, Felix' via isar-users]

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

['Jan Kiszka' via isar-users]

On 23.09.26 15:49, Moessbauer, Felix (FT RPD CED OES-DE) 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?
> 

https://git.kernel.org/pub/scm/linux/kernel/git/cip/linux-cip.git/commit/?id=09490469cfb3b0855cf56badc62c512684d59570

And that although this is an unsupported configuration (arm64 support
got added to CIP with 4.19 only).

So, don't do that.

Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center

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

[Aleksey Laurynovich]

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
> > 
> > -- 
> > You received this message because you are subscribed to the Google
> > Groups "isar-users" group.
> > To unsubscribe from this group and stop receiving emails from it,
> > send an email to isar-users+unsubscribe@googlegroups.com.
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> > https://groups.google.com/d/msgid/isar-users/20260923120346.3256438-1-alaur%40ilbers.de
> > .

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

['Jan Kiszka' via isar-users]

On 24.09.26 11:58, Aleksey Laurynovich wrote:
> 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.
> 

Then send patches upstream, not to isar, disable this inofficial
configuration, or use a (cip-)kernel that supports it. This is just an
exemplary recipe, not worth being patched.

Jan

-- 
Siemens AG, Foundational Technologies
Linux Expert Center

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