Re: [Libunwind-devel] In the Linaro environment ...

[Ken Werner]

On 10/11/2011 07:17 PM, Myke Smith wrote:
> On Oct 11, 2011, at 7:24 AM, Ken Werner wrote:
>
>> On 09/26/2011 05:53 PM, Myke Smith (Palm GBU) wrote:
>>> Ken,
>>>
>>> When running the libunwind test suite on ARM I am getting a large 
number of failures. What is  the expectation and what do you see in your 
environment? Before I start digging in with GDB I want to see if this is 
expected or not.
>>
>> Hello Myke,
>>
>> Sorry for the delay - I've been on vacation.
>> Ubuntu on ARM comes with a compiler that doesn't generate the ARM
>> specific unwind tables by default. I suspect you ran the libunwind
>> testsuite against binaries that don't have any unwind infos (DWARF or
>> ARM exidx). You may try to compile and run the testsuite like this:
>> make check CFLAGS="-funwind-tables"
>>
>> There are still a lot of fails on ARM Linux and any help to get things
>> further is greatly appreciated. The Linaro wiki has a page that focuses
>> on libunwind on ARM and also shows some testsuite results at the end:
>> https://wiki.linaro.org/KenWerner/Sandbox/libunwind
> Ken,
> Thanks, I am on vacation at the moment, I will work on this when I return..

Nice, have a good one! :)

> I do not explicitly call out -funwind-tables but when I run you variant of 
> debuggerd I do get everything to correctly backtrace even with stripped 
> binaries which implies to me that the unwind-tables were being generated.
>
> Thanks for your work on this and I will dig back in on my return.

Since you mentioned "Ubuntu 10.4 armel" and I thought you were using the 
Linaro evaluation builds based on Ubuntu. The Ubuntu ARM binaries are 
not compiled with -funwind-tables while Android on ARM has this flag 
enabled by default. I didn't run/port the libunwind testsuite to 
Android, so I don't have any results for this platform. However, a 
(rather simple) testcase works fine on my PandaBoard. More infos about 
libunwind, Androids debuggerd and the test app can be found at:
http://lists.nongnu.org/archive/html/libunwind-devel/2011-09/msg00037.html

Regards
Ken