Re: compile error on latest git m68k kernel

Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> · Wed, 10 Nov 2010 11:34:47 +0100

On Wed, Nov 10, 2010 at 11:02, Andreas Schwab <schwab@xxxxxxxxxxxxxx> wrote:
Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> writes:
On Wed, Nov 10, 2010 at 08:08, Michael Schmitz
<schmitzmic@xxxxxxxxxxxxxx> wrote:
seen this before?

Not this particular one...

ÂLD Â Â Â.tmp_vmlinux1
fs/built-in.o: In function `alignfile':
binfmt_elf.c:(.text+0x307bc): undefined reference to `__divdi3'
fs/built-in.o: In function `elf_core_dump':
binfmt_elf.c:(.text+0x3139c): undefined reference to `__divdi3'
make: *** [.tmp_vmlinux1] Error 1

Where is that called? ÂThe right fix in most cases is to use do_div from
<asm/div64.h>.

alignfile: roundup(*foffset, 4)
elf_core_dump: roundup(offset, ELF_EXEC_PAGESIZE)
(assumed it's caused by the roundup() calls, assembly output?)

Both are divisions by a power-of-two, but the dividend is a (signed!) long long.

... but depending on the version of gcc, we sometimes need things like
this, cfr.
arch/m68k/lib/. The fix is to add a __divdi3 there.

It is not provided for a reason.

Gr{oetje,eeting}s,

Â Â Â Â Â Â Â Â Â Â Â Â Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
Â Â Â Â Â Â Â Â Â Â Â Â Â ÂÂ ÂÂ -- Linus Torvalds
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