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

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retitle -1 linux: FTBFS on sh4 due to internal compiler error, works with wireless 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 builds
> have shown. This issue is fixed by updating to at least gcc-16 which contains
> a lot of fixes for the GCC SH backend, including a switch to the new register
> allocator LRA.
> 
> After the switch, GCC may still run out of virtual memory on sh4 when building
> 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+deb14-sh7751r-dbg_7.1.4-1_sh4.deb
-rw-r--r-- 1 glaubitz glaubitz      1840 Jul 24 17:13 linux-image-7.1.4+deb14-sh7751r_7.1.4-1_sh4.deb
-rw-r--r-- 1 glaubitz glaubitz      1168 Jul 24 17:14 linux-image-sh7751r-dbg_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 implement
on all sh4 buildds shortly.

Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer
`. `'   Physicist
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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Bug#1141885: linux: FTBFS on sh4 due to internal compiler error, works with gcc-16 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2026-07-12 11:00 +0200
  Bug#1141885: linux: FTBFS on sh4 due to internal compiler error, works with gcc-16 John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> - 2026-07-25 08:10 +0200
  Bug#1141885: marked as done (linux: FTBFS on sh4 due to internal  compiler error, works with wireless stack disabled) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-07-28 07:40 +0200

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