Re: [PATCH] Add non-zero module sections to sysfs

Rusty Russell
2013-04-08T04:14:45Z

Philip Kranz <philip.kranz@googlemail.com> writes:
> Hello.
>
> On Fri, Apr 05, 2013 at 12:07:15PM +0200, James Bottomley wrote:
>> Just so you know: this isn't a parisc specific problem. Gcc produces
>> duplicate section names under various circumstances, but the one that
>> bites us is -ffunction-sections. Note that there are proposals to use
>> -ffunction-sections on all architectures (so we can garbage collect
>> unused functions) in which case you'll induce the bug identified in
>> 35dead4235e2b67da7275b4122fed37099c2f462 on every architecture
>
> I am not able to produce an object file with duplicate section names
> using gcc on x86. Even with -ffunction-sections, every section gets a
> unique name. Is this architecture-specific behaviour of gcc?

Good point. ld -r will collapse them into the same section (since gcc
produces them they have to have the same section attributes).

You can do it with --unique, but no arch uses that. PARISC has a
platform-specific toolchain hack which does that for .text sections.
(Thanks to Alan Modra for that clue...)

Thanks,
Rusty.