Re: Bug#1141885: linux: FTBFS on sh4 due to internal compiler error, works with gcc-16

retitle -1 linux: FTBFS on sh4 due to internal compiler error, works with w=
ireless stack disabled

Hi,

On Sun, 2026-07-12 at 10:58 +0200, John Paul Adrian Glaubitz wrote:
> the kernel build on sh4 fails with an internal compiler error as manual b=
uilds
> have shown. This issue is fixed by updating to at least gcc-16 which cont=
ains
> a lot of fixes for the GCC SH backend, including a switch to the new regi=
ster
> allocator LRA.
>=20
> After the switch, GCC may still run out of virtual memory on sh4 when bui=
lding
> large kernel modules, so the kernel config will just have to be adjusted.=
 I'm
> currently testing a modified kernel config for sh4 and will report back.

OK, so I got this sorted out:

(unstable-sh4-sbuild)glaubitz@esk:~/linux-sh4-3$ ls -l linux-image*deb
-rw-r--r-- 1 glaubitz glaubitz 459630732 Jul 24 17:08 linux-image-7.1.4+deb=
14-sh7751r-dbg_7.1.4-1_sh4.deb
-rw-r--r-- 1 glaubitz glaubitz      1840 Jul 24 17:13 linux-image-7.1.4+deb=
14-sh7751r_7.1.4-1_sh4.deb
-rw-r--r-- 1 glaubitz glaubitz      1168 Jul 24 17:14 linux-image-sh7751r-d=
bg_7.1.4-1_sh4.deb
-rw-r--r-- 1 glaubitz glaubitz      1648 Jul 24 17:14 linux-image-sh7751r_7=
.1.4-1_sh4.deb
(unstable-sh4-sbuild)glaubitz@esk:~/linux-sh4-3$

Disabling the wireless stack is enough. Since we don't use wireless support=
 on sh4
anyway, I will open a pull request shortly pending an additional build test=
 of the
patch.

I've also found a way to resolve the GCC OOM issues on sh4 which I will imp=
lement
on all sh4 buildds shortly.

Adrian

--=20
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
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