Re: [PATCH v2 2/8] makedumpfile: Apply relocation while loading module debuginfo.

[Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com>]

Hi Ken'ich,

On 07/19/2011 07:57 AM, Ken'ichi Ohmichi wrote:
> 
> Hi Mahesh,
> 
> On Fri, 15 Jul 2011 15:51:38 +0530
> Mahesh Jagannath Salgaonkar <mahesh@linux.vnet.ibm.com> wrote:
>>>
>>> On my machine (RHEL5 x86_64), I cannot compile makedumpfile with this patch.
>>> I guess that it is due to old elfutils of my machine, and I am trying this
>>> problem by newer elfutils.
>>>
>>> I'd like to get some hints, so can you tell me your environment ?
>>> RHEL6 x86_64 ?
>>
>> Yes, I had tested these patches on RHEL6.0 and RHEl6.1 x86_64. As far as
>> I know RHEL6.0 had elfutils-0.148.
>>
>> I did not try my patches on RHEL5 x86-64. Let me see if I can get a
>> RHEL5 x86_64 box to verify.
> 
> I can compile it with elfutils-0.137 and some compiling options on RHEL5.
> We need the following change in Makefile.
> 
> -       $(CC) $(CFLAGS) $(OBJ_ARCH) -o $@ $< -static -ldw -lelf -lz
> +       $(CC) $(CFLAGS) $(OBJ_ARCH) -o $@ $< -static -ldw -lbz2 -lebl -ldl -lelf -lz
> 
> 
> By the way, do you have any documents/samples for dwfl_XXXX functions ?
> I'd like to see them for reviewing this patch.

As far as I know there is no formal documentation available for
dwfl_xxxx functions apart from 'elfutils/libdwfl/libdwfl.h' from
elfutils sources. In fact the elfutils itself lacks the Documentation
part for most of it's APIs.

I used 'elfutils/libdwfl/libdwfl.h' from elfutils sources as a reference
which has neat explanation for each dwfl_xxx() functions. Apart from
libdwfl.h I also used to go through actual function implementations
available under elfutils sources.

Thanks,
-Mahesh.

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