Hans,
I've:
[peter@ace tmp]$ diff linux-2.6.35.13/scripts/mod/file2alias.c
linux-3.4.3/scripts/mod/file2alias.c
And found:
727a840
> ADD_TO_DEVTABLE("i2c", struct i2c_device_id, do_i2c_entry);
This line only exists on 3.4.3 version of file2alias.c. Isn't this why
it successfully compile with newer Kernel?
[]'s
Peter
On Tue, Jun 19, 2012 at 11:03 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
> On Tue 19 June 2012 14:50:09 Ezequiel Garcia wrote:
>> Hi Hans,
>>
>> On Tue, Jun 19, 2012 at 3:34 AM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote:
>> > Hi all,
>> >
>> > Yesterday I upgraded the gcc version I use to compile the daily build to
>> > 4.7.1.
>> >
>> > This causes very strange errors when compiling 2.6.39 - 3.3:
>> >
>> > FATAL: media_build/v4l/tuner: sizeof(struct i2c_device_id)=32 is not a
>> > modulo of the size of section __mod_i2c_device_table=18.
>> > Fix definition of struct i2c_device_id in mod_devicetable.h
>> >
>> > This error does not appear when compiling with gcc 4.6.3, and I see
>> > absolutely nothing
>> > wrong with mod_devicetable.h.
>> >
>> > I tried very hard to figure out what is going on and why older and newer
>> > kernels
>> > are not affected, but I still have no idea.
>> >
>> > The error itself it reported by scripts/mod/file2alias.c. I can suppress
>> > that error
>> > but that will just lead to a modpost crash later in the compile process.
>> >
>> > The tuner.o file always causes this. Commenting tuner.o in the Makefile will
>> > cause
>> > the same problems in other modules (cafe_ccic), but there are also i2c
>> > modules that
>> > compile just fine.
>> >
>> > Does anyone have an insight into this? Did something magical change in
>> > kernel 3.4
>> > that fixed this?
>> >
>>
>> Perhaps this thread could be useful:
>>
>> https://lkml.org/lkml/2012/6/15/323
>
> Yeah, I read that as well. But there there is a clear change that caused the
> problem. As far as I can tell include/linux/mod_devicetable.h has identical
> i2c_device_id structs for linux-3.0/1/2/3/4, yet all compile fine with gcc-4.6.3,
> but for gcc-4.7.1 only linux-3.4 compiles.
>
> I'm stumped.
>
> Regards,
>
> Hans
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--
Peter Senna Tschudin
peter.senna@xxxxxxxxx
gpg id: 48274C36
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