[ptxdist] How to keep DWARF debugging symbols for libunwind?

[ptxdist] How to keep DWARF debugging symbols for libunwind?

[Andreas Glatz]

Hi

I'm using libunwind [1] on i.MX6 together with my application to
generate proper backtraces. I found that compiling my app with
debugging symbols (-g) and then preloading libunwind with
UNW_ARM_METHOD_DWARF gives quite meaningful backtraces.

However, after flashing the target I cannot get backtraces anymore as
ptxdist seems to strip the DWARF debugging symbols. I was wondering if
there is a way to instruct ptxdist to retain the debugging symbols for
a specific application? (Or if I should be looking e.g. into
UNW_ARM_METHOD_EXIDX ?)

Kind regards,

Andreas



[1] https://wiki.linaro.org/KenWerner/Sandbox/libunwind

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Re: [ptxdist] How to keep DWARF debugging symbols for libunwind?

[Michael Olbrich]

Hi,

On Mon, Mar 13, 2017 at 08:32:00AM +0000, Andreas Glatz wrote:
> I'm using libunwind [1] on i.MX6 together with my application to
> generate proper backtraces. I found that compiling my app with
> debugging symbols (-g) and then preloading libunwind with
> UNW_ARM_METHOD_DWARF gives quite meaningful backtraces.
> 
> However, after flashing the target I cannot get backtraces anymore as
> ptxdist seems to strip the DWARF debugging symbols. I was wondering if
> there is a way to instruct ptxdist to retain the debugging symbols for
> a specific application? (Or if I should be looking e.g. into
> UNW_ARM_METHOD_EXIDX ?)

There is currently no full solution for this. I use nfsroot, and we keep
the debug symbols there, so it's not a problem in my use-cases.
You can instruct ptxdist not to strip individual files in the install_*
commands in targetinstall, but that will break, when the stack enters a
different library.

I have some kind debug packages on my todo list for ptxdist and a vague
idea on how to do this but I currently don't have the time to implement
this.

Michael

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