Bug#637360: backtrace() doesn't work on armel

[Jonathan Nieder <jrnieder@gmail.com>]

severity 637360 wishlist
retitle 637360 [arm] backtrace() requires unwind information
# unlikely to be fixed any time soon
tags 637360 + upstream wontfix
quit

Hi Stéphane,

Stéphane Glondu wrote:

>   #include <execinfo.h>
>
>   int main() {
>     void *buffer[100];
>     return backtrace(buffer, 100);
>   }
>
> returns 0. It returns with a non-zero status (3 everywhere I've tried
> myself) on all other release architectures.
>
> Is that expected?

I'm surprised it works on mips.  Building with -funwind-tables should
help.

This is a somewhat fundamental limitation, and very hard to work
around.  See e.g. [1] for inspiration if you want to work on it.

Hope that helps,
Jonathan

[1] http://www.celinux.org/elc08_presentations/ELC2008%20-%20Back-tracing%20in%20MIPS-based%20Linux%20Systems.pdf