[patch] Nios II build_id fix

[Sandra Loosemore]

On 04/04/2014 07:31 PM, Alan Modra wrote:
> On Fri, Apr 04, 2014 at 10:52:22AM -0700, Cesar Philippidis wrote:
>> @@ -2016,6 +2016,10 @@ nios2_elf32_build_stubs (struct bfd_link
>>       {
>>         bfd_size_type size;
>>
>> +      /* Ignore non-stub sections.  */
>> +      if (!strstr (stub_sec->name, STUB_SUFFIX))
>> +	continue;
>
> Um, how do you manage to get non-stub sections in the stub bfd?  Hmm,
> via dynobj being set to the stub bfd, I expect.  If so, you could
> probably test (stub_sec->flags & SEC_LINKER_CREATED) == 0 instead.

I had the same question when looking at this code.  I think this also 
suffers from the same bug (PR 13049) mentioned in the comment on 
STUB_SUFFIX in elf32-arm.c.

Hmmmm.  I see that stub sections are being created without 
SEC_LINKER_CREATED (ld/emultempl/nios2elf.em), while dynamic sections 
created in dynobj do have that flag by default (from 
ELF_DYNAMIC_SEC_FLAGS).  Other sections that end up in dynobj maybe do, 
maybe don't -- it doesn't seem like a reliable way to distinguish stub 
sections from anything else, at least.

Maybe we could define a new section flag for actual stub sections? 
That's a target-independent change (bfd/section.c) and I couldn't 
approve it.  Alan, WDYT?

Otherwise, I suppose we're stuck with the same band-aid in the ARM 
backend....

-Sandra