[fedora-arm] F13 glibc patches for ARM?

[Andrew Haley]

On 08/15/2011 11:46 AM, Gordan Bobic wrote:
>  On Mon, 15 Aug 2011 11:30:36 +0100, Andrew Haley <aph at redhat.com> 
>  wrote:
>> On 08/15/2011 11:11 AM, Gordan Bobic wrote:
>>>  On Mon, 15 Aug 2011 09:57:44 +0100, Andrew Haley <aph at redhat.com>
>>>  wrote:
>>>> On 08/10/2011 02:43 PM, Gordan Bobic wrote:
>>>>>>>  On Sat, 06 Aug 2011 10:24:03 +0100, Andrew Haley 
>>>>>>> <aph at redhat.com>
>>>>>>>  wrote:
>>>>>>>> On 08/05/2011 09:07 PM, Gordan Bobic wrote:
>>>>>>>>> Thanks for pointing out, it does look like the same bug. So
>>>>>>>>> what's
>>>>>>>>> the
>>>>>>>>> fix/workaround?
>>>>>>>>>
>>>>>>>>> On 08/05/2011 08:59 PM, Niels de Vos wrote:
>>>>>>>>>> On 5 Aug 2011 19:15, "Gordan Bobic" <gordan at bobich.net
>>>>>>>>>> <mailto:gordan at bobich.net>> wrote:
>>>>>>>>>>  >
>>>>>>>>>>  > How does one pick the correct "ports" part of glibc for 
>>>>>>>>>> the
>>>>>>>>>> correct core?
>>>>>>>>>>  >
>>>>>>>>>>  > I tried to build the RHEL6 glibc with the F13 ports tar
>>>>>>>>>> ball,
>>>>>>>>>> but the
>>>>>>>>>>  > build eventually fails:
>>>>>>>>>>  >
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> /usr/lib/gcc/armv5tel-redhat-linux-gnueabi/4.4.5/libgcc_eh.a(unwind-arm.o):
>>>>>>>>>>  > In function `__gnu_Unwind_Backtrace':
>>>>>>>>>>  > (.text+0x8b8): undefined reference to `__stack_chk_guard'
>>>>>>>>>>  > collect2: ld returned 1 exit status
>>>>>>>>>>
>>>>>>>>>> Looks very much like the error in
>>>>>>>>>> https://bugzilla.redhat.com/show_bug.cgi?id=726495
>>>>>>>>
>>>>>>>> What is it linking against?  __stack_chk_guard should be 
>>>>>>>> defined
>>>>>>>> in
>>>>>>>> libc.a.
>>>>>
>>>>>  What I would really like to know is what fix the bugzilla ticket
>>>>> above
>>>>>  refers to. The last response from Andrew reads:
>>>>>  "I suspect this is just another manifestation of the bug, now
>>>>> fixed,
>>>>>  that causes
>>>>>  gcj programs not to link,  I certainly had no such problem when I
>>>>> built
>>>>>  libc
>>>>>  yesterday."
>>>>>
>>>>>  There's no reference to another bug. Can anyone point me in the
>>>>>  direction of the relevant bugzilla ticket that fixes the said gcj
>>>>>  linking issue? I just searched on RH bugzilla and couldn't find
>>>>> anything
>>>>>  of relevance.
>>>>
>>>> Sorry, I gave up on F13 when it became EOL and moved to F15.  No 
>>>> more
>>>> bugs were being accepted.
>>>>
>>>> Is /usr/lib/gcc/armv5tel-redhat-linux-gnueabi/4.4.4/libgcc_s.so (or
>>>> whatever)
>>>> a symlink or a text file on your system?
>>>>
>>>> It should look like this:
>>>>
>>>> /* GNU ld script
>>>>    Use the shared library, but some functions are only in
>>>>    the static library.  */
>>>> GROUP ( /lib/libgcc_s.so.1 libgcc.a )
>>>
>>>  It's a symlink to libgcc_s.so.1. Should it be a text file??
>>
>> Yes.  This is a bug in the Fedora gcc specfile.  Upstream gcc is
>> correct.
> 
>  Got a link to the relevant spec file patch handy?

I don't think this is the cause of your bug, but I've attached my specfile.

>>>  In the meantime I was able to get glibc to build using Niels' hack
>>>  here:
>>>  https://bugzilla.redhat.com/show_bug.cgi?id=726495
>>>
>>>  This seems to work, but can you think of a better way to do this?
>>
>> My builds of unwind-arm.o do not call `__stack_chk_guard'.
>>
>> I think we need to look at why there is a call to `__stack_chk_guard'
>> in your unwind-arm.o.  I suspect that it may be compiled with
>> -fstack-protector, and it shouldn't be.
>>
>> Can you have a look and see where that call is coming from?
> 
>  Well, glibc's rebuild doesn't seem output the things it runs as you 
>  would expect "make" to, so it's a bit hard to tell. I'll un-apply Niels' 
>  patch and see if I can track it down when it occurs. It may be a while 
>  because the build time is non-trivial on a SheevaPlug.

No, the bug is in the *gcc* build, not glibc.  This is not a glibc bug.

You need to "nm unwind-arm.o" in the gcc bulld tree.  Does it have a ref
to `__stack_chk_guard' ?

Andrew.
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